2007 Vol. 15, No. 2

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Effects of eco-agriculture and biomass engineering on circular economy in China
CHENG Xu
2007, 15(2): 1-4.
Abstract(797) PDF(854)
Abstract:
The formation,development and utilization of the circular economy theory and its relationships to biomass engineering and eco-agriculture are discussed.The biomass engineering,including biomass materials and energy,is an important component of eco-agriculture which is an intensive process producing biomass and jointing the biomass engineering to the circular economy.Agriculture containing the biomass engineering and circular economy can be more closely combined with the modern economy,improve the development of agricultural industry and increase the incomes of farmers.
Cap dynamics and landscape patterns of forest in central subtropical evergreen broad-leaved forest—A case study from Wanmulin Natural Reserve Area in Fujian Province
YAN Shu-Jun, HONG Wei, WU Cheng-Zhen
2007, 15(2): 5-8.
Abstract(881) PDF(777)
Abstract:
The gap dynamics and landscape patterns of forest in the central subtropical evergreen broad-leaved forest in Wanmulin Natural Reserve Area of Fujian Province were analyzed with landscape ecological method.The results show that the patch form is more irregular and the patch fragmentation more obvious with the gaps growing,while the patch fractal dimension gradually becomes small.The patch fractal dimension of canopy gaps is smaller than that of the expended gap.
Species diversity in different forest landscapes in the Wuyishan Scenery District
HE Dong-Jin, HONG Tao, HU Hai-Qing, WANG Ying-Zi, LIU Yong-Sheng, FAN Sheng-Feng
2007, 15(2): 9-13.
Abstract(877) PDF(1389)
Abstract:
Species richness,species diversity index and evenness index of six forest landscape types in Wuyishan Scenery District including Pinus massoniana forest,Cunninghamia lanceolata forest,economic forest,bamboo forest,broad-leaved forest and Camellia sinensis plantation were discussed by using the sampling data.The results show that species richness is different with types of vegetation in six forest types.Species richness of shrubs is higher,whereas those of trees and herbs are lewer,and the vertical structure of species richness is in the following order:shrubs＞trees＞herbs in most forest types.The differences of species diversity among the six forests are significant,and the order of species diversity is broad-leaved forest＞Pinus massoniana forest＞Cunninghamia lanceolata forest＞bamboo forest＞Camellia sinensis plantation＞economic forest,which accords with the general law of the variety of species diversity:natural forest＞half artificial forest＞artificial forest.The results of species diversity of different stages in Pinus massonianaforest indicate that species diversity is increased with the succession of forest.Comparison of species diversity in the Wuyishan Scenery District with that in other areas shows that Wuyishan Scenery District is an area with a very abundant plant diversity.
Allelopathic effects of aqueous extracts from different parts and root exudates of rice on barnyardgrass
HE Hai-Bin, WANG Hai-Bin, CHEN Xiang-Xu, LIN Wen-Xiong, JIA Xiao-Li, FANG Chang-Xun, GAN Qiu-Feng, NI Ni-Na, WU Wen-Xiang
2007, 15(2): 14-17.
Abstract(1009) PDF(1027)
Abstract:
Under natural conditions,the inhibitory rate(IR)of aqueous extracts from different parts of allelopathic rice accession “PI312777”(planted in paddy soil)in different life stage(3～6 leaf)to the root growth of barnyardgrass were studied.The IR of root exudates at 6 leaf stage of rice planted in paddy soil and in hydroponics and treated by polar resin ADS-21 and nonpolar resin ADS-5 respectively,were tested in the bioassay.The results show that the IR of the aqueous extracts in same rice parts at 5 leaf stage is the highest among 3～6 leaf stages,and the IR of the aqueous extracts from leaves at 5 leaf stage is the strongest.The IR of the root exudates of the rice which are planted in paddy soil to 6 leaf stage is 47.06%,and the IR increases to 64.71% after treated by ADS-21 and decreases to 26.47% after treated by ADS-5;the IR of the root exudates of the rice which are grown in hydroponics to 6 leaf stage is 38.24%,and the IR increases to 58.82% after treated by ADS-21 and decreases to 20.59% after treated by ADS-5.The results implies that the allelopathic effects of the rice root exudates might be mainly resulted from the nonpolar(or weak polar)components,and could be weaken by the polar components.
Ecological adaptability and venture climatic subarea Zoning based on frost in florescence of apricot in Xinjiang
XU De-Yuan, WANG Jian, REN Shui-Lian, YANG Xiao-Guang, CUI Xiao-Jun
2007, 15(2): 18-21.
Abstract(1006) PDF(1010)
Abstract:
The natural conditions such as sunshine intensity,heat and water resources,and soil environments in Xinjiang apricot production areas are fit for the growth of apricot.The apricot can bloom and fruit normally provided that the acumulated temperature over 10℃ is more than 2500℃ from sprouting to fruit maturing of apricot.Yeild of apricots is limited by low temperature and forst in its florescencs influencing its economy.Because of the lower temperature in winter in north part of Tianshan Mountain,the survival rate through the winter is very low limiting the development of apricot in this area.By using the theory of analyzing natural disaster and the losing rate as the climatic index,the apricot planting areas in Xinjiang are zoned into four climatic parts.And the frequency of frost,degree of freeze injure,advantage and disadvantage of developing apricot industry in Xinjiang are discussed.
Temporal-spatial variation of elongating time of wheat in Huang-Huai wheat production area
ZHONG Xiu-Li, WANG Dao-Long, LI Yu-Zhong, ZHAO Peng, YAN Xu-Yu, SUN Zhong-Fu
2007, 15(2): 22-25.
Abstract(784) PDF(932)
Abstract:
Twenty years data of winter wheat elongating time,varieties,vernalization feature,and average air temperature of every 10 days in spring,occurrence and injury of frost,etc.were collected from 36 agro-meteorological observation stations,which are located in Huang-Huai wheat production area and its around areas.With these data,the main factors that affect the elongating time of winter wheat were analyzed;the function on accumulative probability with time was established and the variations of some main parameters in this area were also analyzed.Finally,the causes for the variation in parameters were discussed and the guidance for the practical production was also proposed.
Evaluation on black soil nutrients and fertilization recommendation in Dehui City
WANG Yang, I Xiao-Ning
2007, 15(2): 26-27.
Abstract(754) PDF(831)
Abstract:
A comprehensive evaluation on black soil nutrients was conducted with five indexes.The results show that the available K and CEC are abundant,available P and organic matter are medium and total N content is lack,pH is different among every plots. Nutrient preserving capability and fertilizer response are fine,but soil fertility degrades seriously.Thus,more manure,increased N,controlled P,retained K,and a suitable amount of trace element fertilizer should be applied in Dehui City to keep the sustainable productivity of black soil.
Nutrient cycling and utilization in a forage cultivation-cattle raising-biogas fermentation ecosystem in red soil regions
LIU Jing-Rong, SHI Qing-Hua, XIE Guo-Qiang, ZHANG Mei-Liang
2007, 15(2): 29-32.
Abstract(924) PDF(674)
Abstract:
Rye grass and maize cultivated in mid-mellow hilly red soil were harvested to feed beef cattle.In the process of forage cultivation and cattle raising,two treatments were set,one of which was that forage was fertilized with chemical fertilizer only and was harvested to feed beef cattle(CK);another was that cattle feces and urine fermented in biogas pool was mixed with chemical fertilizer and the biogas-tank sludge,and applied to forage fields to grow animal feed.The results of two-year experiments show that the yield and nutrient accumulation of maize plants with the mixed application of biogas-tank sludge,are higher than those with chemical fertilizer only, but on the contrary,those of rye grass are lower.The application of mixed biogas-tank sludge can save chemical fertilizer by 1/2.There is little difference among cattle's digestion and recovery rate of nutrient of the same forage with different fertilization compositions, but there is significant difference among those of varieties and with different harvesting times of the forage. Most nutrients in the cattle's excrements can be recovered after biogas fermentation,saving about half of the input of the chemical fertilizer.The mixed application of biogas-tank sludge can maintain and improve the soil fertility,which provides better soil conditions for the sustainable production of forage.
Effects of a long-term located fertilization on soil quality of grey desert soil
ZHOU Bin, QIAO Mu, WANG Zhou-Qiong
2007, 15(2): 33-36.
Abstract(680) PDF(765)
Abstract:
The grey desert soil was selected as the objective to study the dynamical changes of soil enzyme,soil chemical and physical properties through comparing the soil changes under different fertilizers in a long-term located experiment.The result shows that the main nutrient contents and soil enzyme activities are increased with the fertilizer added.Soil enzyme,soil chemical and physical properties are evidently different among different fertilizer treatments.Nitrogen and soil organic matter are the key control factors of soil enzyme and the yield of wheat in grey desert soil.Soil organic,soil total nitrogen and available nitrogen have obvious effects on soil proteinase activity,phosphatase activity,urease activity,and invertase activity.There is a significant correlation among soil enzyme,soil chemical and physical properties.
Effects of different C/N combinations of fertilizers on biological fixation and release of nitrogen fertilizer and wheat growt
TANG Yu-Xia, MENG Chun-Xiang, JIA Shu-Long, WANG Hui-Min, LIU Qiao-Ling
2007, 15(2): 37-40.
Abstract(1030) PDF(1066)
Abstract:
The incubation experiment and pot experiment were conducted to study the effects of different C/N combinations of fertilizers(corn straw+urea)on biological fixation and release of nitrogen fertilizer and wheat growth.The results show that the biological nitrogen fixation is improved with the increase of C/N ratio.But the releasing rate of microbial biomass nitrogen decreases gradually.With the increase of C/N ratio of fertilizer combination,the restraint to nitrate nitrogen in soil becomes stronger.When corn straw is applied to wheat field,the C/N≤20 is suitable for the growth of wheat.
The impacts of nutrient elements on the growth and disease resistance of Astrgalus membranaceus(Fisch) Bge
WANG Wei-Ling, LIANG Zong-Suo, CHOU Li-Yun, WANG Tie-Zhu, WEN Shan-Ying, LI Xiao-Juan
2007, 15(2): 41-43.
Abstract(957) PDF(1028)
Abstract:
A field experiment was conducted to study the impacts of N,P,K nutrition and their combination matches on the growth of leaves,stems and roots,and the infection rate of root rots and purple root rots of Astrgalus membranaceus (Fisch) Bge. The results show that fertilizer-N is very useful for the growth of roots and leaves,fertilizer-K can promote the growth of roots and increase the root-shoot ratio. Fertilizer-P can increase the infection rate of root rot,fertilizer-N and fertilizer-P may cause an opposite effect. Fertilizer-P increases the infection rate of purple root rots.fertilizer-N's function is not obvious.Mixing fertilizers rationally improve the yield of the root of Astrgalus membranaceus(Fisch)Bge.K fertilizer can improve the disease resistance of Astrgalus membranaceus(Fisch)Bge.
Effects of manganese and boron nutrition on yield and activities of antioxidant enzymes of cucumber(Cucumis sativus L.)
SHI Jin-Lin, NA Ling-Jie, MA Qiong-Yuan, FENG Cui-Ping, DAN You-Ming
2007, 15(2): 44-46.
Abstract(1153) PDF(1172)
Abstract:
The field experiment was conducted and physiological characters were measured to study the effects of manganese and boron nutrition on yield and antioxidant enzymes of cucumber(Cucumis sativus L.).The results show that there is a remarkable interaction between Mn and B. The combination of Mn and B nutrition at a proper level can increase cucumber yield,activities of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT),nitrate reductase(NR),and contents of chlorophyll,antiscorbutic acid(ASA);decrease malondialdehyde(MDA)content.There are a significant positive relationship between productive capability of cucumber and the activities of SOD,POD,CAT,NR,and a significant negative correlation with the MDA content.
Releasing of N,P and K of organic fertilizers and their effects on the contents of available Cu, Zn,Fe and Mn in soil
ZHAO Ming, CHEN Xue-Hui, ZHAO Zheng-Yu, CAI Kui, WANG Zheng-Guo
2007, 15(2): 47-50.
Abstract(1289) PDF(1688)
Abstract:
The mineralizing rates of the organic fertilizers of chook dung,cattle dung and pig dung and the releasing rates of the available N,P,K in them were studied with an incubation method in lab;moreover the effcts of the organic fertilizers on the contents of available Cu,Zn,Fe and Mn in soil were analyzed.The results show that the mineralizing rates of organic carbon in the above three organic fertilizers are 87.5%,71.9% and 55.4%,respectively after the application of organic fertilizers in soil for 120 days;the releasing rates of the alkaline hydrolyse N are 39.9%,20.6% and 35.3%,respectively;the releasing rates of available P and available K are 24.6%,61.3%,34.8% and 78.8%,36.8%,41.5%,respectively.Under the condition of experiment the application of chook dung,cattle dung and pig dung in soil can improve the contents of available Cu and Mn,but decrease the content of available Zn;the chicken dung increases the content of available Fe,but the cattle dung and pig dung have the negative effects.
Effects of humic acid compound fertilizers on the nitrogen utilization and effects on the following rape
PENG Zheng-Ping, MEN Ming-Xin, XUE Shi-Chuan, XUE Bao-Min, BI Shu-Qin
2007, 15(2): 51-53.
Abstract(912) PDF(849)
Abstract:
Effects of different amounts of humic acid(HA) compound fertilizer on the yield and N utilization of rape(Brassica campestris L.ssp.chinensis L.Makino)were studied under an experimental condition.Theresults show that HA compound fertilizer can enhance the yield of rape.The relationship between fertilizer application amount and yield of rape can be described with a quadratic curve regression model.The yield of the rape indicates that HA compound fertilizer is slow-releasing with long efficient period and high-nutrient-utilization-ratio.Nitrate reductase activity changes as a shape“S”and its peak is at 600kg/hm2 application amount of HA,but the peak of NO-3-N content is at 1200kg/hm2.HA compound fertilizer increases the absorption and utilization ratio of N in rape,and improves the N nutrient in soil.
Simulation of soil desiccation and yield fluctuation of high yield maize field on rain-fed highland of the Loess Plateau
LI Jun, SHAO Ming-An, ZHANG Xing-Chang, LI Shi-Qing
2007, 15(2): 54-58.
Abstract(914) PDF(1062)
Abstract:
In order to study the soil desiccation and yield fluctuation of high yield maize on Loess Plateau,the EPIC model was used to simulate water potential productivity(WPP)of spring maize and soil water dynamics on rain-fed highland at Changwu County of the Loess Plateau for a medium term (12 years) assessment and a long term(30 years)forecast simulated research,respectively.The results show that during 12-year real-time weather condition simulation period,WPP of spring maize on rain-fed highland fluctuates and declines along with precipitation changes,crop available soil water amount in 3m soil layer also fluctuates and declines evidently,and the trend of soil desiccation is remarkable.During 30-year simulated weather condition simulation period,WPP of spring maize on rain-fed highland fluctuates along with precipitation but declines slightly;crop available soil water amount in 3m soil layer fluctuates seasonally and annually,and has a light increase trend for a long term period.Soil desiccation of maize field on rain-fed highland is a short time phenomenon and usually does not last for long time if the declining trend of precipitation is not distinct,but the fluctuation of maize yield along with precipitation change is inevitable.
Studies on the drought-resistance of dryland winter wheat based on soil-stored water before sowing
GAO Yu-Feng, WANG Yong, FAN Ting-Lu, WANG Li-Ming
2007, 15(2): 59-62.
Abstract(975) PDF(791)
Abstract:
Under different soil-stored water levels,the drought-resistance of 14 dryland winter wheat varieties of different ecological types was researched by means of drought-resistance index,subordinate function values and fuzzy synthetic determination.It is shown that the yield and WUE of dryland winter wheat are improved significantly along with the increasing of soil-stored water before sowing.Under the same soil-stored water level,there is a remarkable difference of the yield and WUE among different varieties.And the reaction to soil-sorted water of different ecological types of winter wheat is different.The drought-resistance of dryland winter wheat can be evaluated excellently by the three methods of drought-resistance index,subordinate function values and fuzzy synthetic determination.The results are basically consistent.Drought-resistance of the tested varieties from different regions appears as East Gansu＞Shanxi＞Beijing＞Weibei Highland＞Huanghuai Plain.
Biological characters and high yield culture techniques of winter wheat “Linfeng 615”
LIU Xin-Yue, WEI Yun-Zong, ZHANG Jiu-Gang
2007, 15(2): 63-65.
Abstract(765) PDF(899)
Abstract:
Abstract The law of growth and development and integrated cultural techniques of winter wheat new variety “Linfeng 615”with water-saving and high yield were studied.The results show that tiller ability of “Linfeng 615”is strong with two tillering peaks.Its ear differentiation is slow in prophase and quick in late stages with a short period of organ generation.The grain filling presents a slow-quick-slow process with time.The comprehensive cultural techniques of “Linfeng 615”aiming at stabilizing ears,raising grains and grain weight involve fine seeding technique to establish the rational high quality population,scientific irrigation,balanced fertilization,diseases and insects control.Through complementation of these techniques,the yield of winter wheat can be increased to 8250～9000kg/hm2.
Effects of plastic film and straw mulching on field environment and yield of maize
MAI Zi-Zhen, CHENG Bing-Wen, WANG Yong, LUO Shi-Wu
2007, 15(2): 66-68.
Abstract(893) PDF(932)
Abstract:
The field experiment was conducted to study the effects of plastic film and straw mulching on field environment and yield of maize.The results show that the temperature in crown layer of maize can be decreased by 1～2℃，and the evaporation of maize field is reduced significantly.In addition,the preservation effect on soil heat is also obvious.Therefore,the yield and water use efficiency(WUE)of maize can be raised significantly.
Effects of different mulching methods on physiological characteristics and economic traits in flue-cured tobacco
XU Zi-Cheng, ZHANG Ting, CHENG Chang-Xin, MA Cong, MA Jing-Min
2007, 15(2): 69-72.
Abstract(1202) PDF(1115)
Abstract:
The variations of soil temperature,enzyme activity,contents of chlorophyll(CHL)and malondialdehyde(MDA)in flue-cured tobacco under four mulching methods were studied.The results indicate that the soil temperature at the depth of 5cm and 10cm mulched by straw is lower than that mulched by film during the whole period.Compared with other three treatments of mulching film during the whole period,mulching straw on the ridge during the whole period,and picking-up film and then earthing-up during the blooming period,the treatment of picking-up film,earthing-up during the blooming period,then mulching straw on the ridge has a higher soil temperature at the beginning of planting,and a lower soil te mperature after straw mulching.Also its content of CHL,activities of peroxidase(POD)and nitrate reductase(NR)are higher;content of MDA is lower;and its yield,average price,value and percentage of superior leaves are higher than those of other treatments
Effects of different mulching methods on growth,development and physiological characteristics of cucumber in solar greenhouse
ZHAI Sheng, LIANG Yin-Li, WANG Ju-Yuan, DAI Quan-Hou, ZHAI Ji-Yuan, XIONG Ya-Mei
2007, 15(2): 73-77.
Abstract(1169) PDF(761)
Abstract:
The effects of soil surface mulching with different materials including wheat straw,plastic film and wheat straw with plastic film on growth,development and physiological characteristics of grafted and non-grafted cucumber in solar greenhouse were studied.The results show that soil surface mulching not only improves the growth of plants, but also is beneficial to formation and development of the pistillate flower,increases fruit-setting percentage,reduces malformation rate of cucumber,shortens fruit-developing period and enhances single cucumber weight.Moreover,the forepart yield and total yield are both enhanced under the treatments mentioned above.Among which,the effect of wheat straw with plastic film mulching is the best,then wheat straw mulching and plastic film mulching follow.Besides,the net photosynthetic rate,light use efficiency and water use efficiency of leaves increase to some extent under different mulching treatments.And the effects of wheat straw with plastic film mulching exceed the other two treatments,and the effect on grafted cucumber are better than that of non-grafted one.Under the wheat straw and straw with film mulching treatments,chlorophyll content increases,root vitality is enhanced during whole fruiting stage.But if the soil surface is mulched with plastic film,chlorophyll content keeps lower than that of control during whole fruit stage,root vitality at late-fruiting stage becomes more inactive than that of the other two mulching treatments,but still higher than that of control.
Studies on microflora in several types of paddy soils in Hunan Province
TAN Zhou-Jin, ZHANG Yang-Zhu, ZHOU Qing-Ming
2007, 15(2): 78-80.
Abstract(985) PDF(1087)
Abstract:
The microflora of seven types of paddy soils in three bases of national rice engineering,Liling Municipality,Changsha Municipality and Xiangyin Municipality,east-southern Hunan Province,was investigated.The results show that the total amount of microorganisms in the tested soils is related to the soil fertility.The amount order of microbes in seven paddy soils is as the followings:yellow sandy earth＞purple sandy earth＞alluvial sandy earth＞purple clayey earth＞reddish yellow clayey earth＞chao sandy earth＞yellow clayey earth.And the amount of several special physiological groups of microbes in yellow clayey earth and reddish yellow clayey earth,whose structures are tight,is less than those in the other several types of soils, such as purple sandy earth and alluvial sandy earth.In order to develop agriculture,reasonable cropping measures should be taken according to soil type
Ecological research on arbuscular mycorrhizal fungi from the rhizosphere of Caragana korshinskii in the Loess Plateau
HE Xue-Li, ZHAO Li-Li, YANG Hong-Yu
2007, 15(2): 81-84.
Abstract(1544) PDF(1088)
Abstract:
Spatial distributions of arbuscular mycorrhizal fungi in the rhizosphere of Caragana korshinskii and its relativity to soil factors were investigated in four natural environments of Yanan，Suide,Hengshan and Yulin in Shaanxi Province.The results show that sampling sites have significant effects on the percentages of colonization of vesicle and arbuscule and the spore density of AM fungi.The highest value of vesicular colonization and spore density are in Suide,and the highest arbuscular colonization is in Yulin.Sampling depth of soil significantly affects the spore density in four sites,the highest spore density appears in 10～20cm soil layer;the highest percentage of colonization of AM fungi occurs at 0～10cm or 20～30cm soil layer.Spore density is positively correlated with vesicular colonization and negatively correlated with arbuscular colonization.Spore density is also negatively correlated with the contents of soil organic matter,soil available P,soil available K and soil Cl-.Vesicular colonization has a positive correlation to soil pH and a negative correlation to the contents of soil moisture,soil available K and soil Cl-.Most of AM fungi in the samples belong to Glomus,but a few of species belong to Acaulospora and Scutellospora.The results suggest that the spore density and the extent of vesicular colonization are useful indicators for evaluating the changes of soil environmental ecosystems.
Selection of lead-resistant strains of microorganisms from soil
CHEN Can-Can, XIE Ying-He, HONG Jian-Ping, HE Xiao-Feng, LI Hong-Mei
2007, 15(2): 85-87.
Abstract(952) PDF(701)
Abstract:
Twelve very strong lead-resistant strains of microbes were isolated from soil through adding a definite concentration of Pb (300mg/kg) in the medium.No.1 to No.5 strains were bacteria,No.6 to No.9 were actinomyces and No.10 to No.12 were fungi.Through observation on their microcosmic orphology,antagonizing test and simulated Pb-removing experiments of lead-contaminated liquid and soil by these bacterium,it is found that twelve resistant strains of microbe are effective in lead-reducing.The lead-reducing effects of No.3,No.4,No.6,No.7,No.8 and No.10 are higher in liquid test,the reducing rate can reach more than 70%;the effects of No.3 and No.7 are higher in soil,the reducing rate can reach 63.8% and 66%,respectively.
Response of photosynthesis and respiration to weak light in seedlings of four capsicum cultivars
SUI Xiao-Lei, ZHANG Zhen-Xian, ZHANG Bao-Xi, MAO Sheng-Li, WANG Li-Hao
2007, 15(2): 88-91.
Abstract(1095) PDF(922)
Abstract:
The characters of photosynthesis and respiration in seedlings of four capsicum cultivars,i.e.“Zhongjiao No.5”,“Zhongjiao No.6”，“Zhongjiao No.10”and“Hongyingda”,under 300μmol/m2·s and 100μmol/m2·s artificial light were studied.The results show that under weak light,net photosynthetic rate (Pn),dark respiration rate (Rd),night respiration rate (Rn),saturation light (SL),light compensation point (LCP) decrease,but apparent quantum yield (AQY) increases.The decrease of Pn under weak light is the result of non-stomatal limitation.The important cause of Pmax decreasing is lower rubisco carboxylation activity.Under weak light the chlorophyll content(Chl.)increases,but the chlorophyll a/b ratio (Chl.a/b) and specific leaf mass (SLM) decline. Among four capsicum cultivars,“Zhongjiao No.10”with relatively lower LCP,Rd and Rn,higher AQY under weak-light shows a potential weak-light-tolerance.
Changes of photosynthetic efficiency and chloroplast ultrastructure of narcissus leaf blades in different development stages
QIU Jin, ZHONG Ran, HAN Chuang, YANG Sheng-Chang, CHEN Ping
2007, 15(2): 92-95.
Abstract(1105) PDF(703)
Abstract:
At four development stages of narcissus,i.e.narcissus-bolting stage,flowering stage,blossom fall stage and post floral stage,some physiological and biochemical characteristics of leaf blades,such as photosynthetic rate,transpiration rate,contents of chlorophyll and protein were measured and the change course of the chloroplast ultrastructure was observed.With the development of narcissus,the water content and stomata conductance decrease significantly,the net photosynthetic rate,the respiratory rate and the ratio of photosynthetic rate to respiratory rate also decrease obviously,whereas the content of chlorophyll rises obviously,the value of chlorophyll a/b reduces tardily and the content of soluble protein presents a decreased tendency.Furthermore,the electron microscope observation shows that the ultrastructures of chloroplast grana and grana lamella are developed and clear at bolting stage,inflated and loose at flowering stage,withered at blossom fall stage and disaggregated at post floral stage.
Residual dynamics of sporgon in stored mango and its safety evaluation
LU Zhi-Xin, LIN Ming-Zhen, HUANG Hui-Ye, LI Xue-Sheng
2007, 15(2): 96-98.
Abstract(971) PDF(862)
Abstract:
Residual dynamics in stored mango treated by 50% WP sporgon were analyzed by GC with ECDNi63.The result shows that the sporgon aggradational amounts of the sporgon-treated stored mango are 0.8929～1.0433mg/kg in Guangxi Province and 0.8506～0.9522 mg/kg in Guangdong Province.The periods of half-lives are 8～9 days in Guangxi and 8 days in Guangdong,respectively.More than 92% sporgon is degraded 30 days after the sporgon is applied.The last residues are 0.0003～0.0082mg/kg in Guangxi and 0.0003～0.0089 mg/kg in Guangdong in mango flesh,and 0.0037～0.1171 mg/kg in Guangxi and 0.0030～0.1179 mg/kg in Guangdong in whole mango (flesh and skin)after the mangos are treated with 1000～2000mg/kg sporgon and stored for 10～30 days.It is suggested that the application of 1000～2000mg/kg 50% WP sporgon on the stored mango with at least 10 days interval between two applications is safe to conserve mango with less than 2mg/kg residual in the fruit.
Effects of single heavy metal pollution on the growth and physiological and biochemical characteristics of Eulaliopsis binata
IE Bai-Qing, YUAN Min, TANG Mei-Zhen, QIN Pu-Feng, YANG Yong-Xing
2007, 15(2): 99-103.
Abstract(1609) PDF(1094)
Abstract:
The effects of Cd,Pb,Cu,Zn and As on the growth and physiological and biochemical characteristics of Eulaliopsis binata were studied.The results show that the resistance of Eulaliopsis binata root to heavy metals is stronger than that of shoot.The critical values of Cd,Pb,Cu of the polluted soil that Eulaliopsis binata is grown on are 10mg/kg,300mg/kg and 100 mg/kg,respectively.The pot experimental results show that contents of chlorophyll and chlorophyll a/b in Eulaliopsis binata growing in treated soils with Cd,Pb,Cu,Zn and As separately are less than those of CK.With the increase of the concentration of Cd,Pb,Cu,Zn and As,the content of chlorophyll increases first and decreases afterwards.With the increase of the concentration of As and Cd,the activity of SOD increases first and decreases afterwards.But the activity of SOD decreases with the increase of the concentration of Pb,Cu and Zn.The activity of CAT and POD increases with the increase of the concentration of As and increases first and decreases afterwards with the increase of the concentration of Cd,Pb,Cu and Zn.
Response of thirty species of herbaceous ornamental plants to simulated acid rain
ZHANG Guang-Sheng, GU Su-Yun, HU Jie, ZHOU Qing
2007, 15(2): 104-107.
Abstract(919) PDF(787)
Abstract:
Urgent effect of simulated acid rain sprayed on leaves of thirty herbaceous ornamental species was studied.The results show that the injured areas of foliar of ornamental plants are enlarged when the pH value of acid rain decreases.Foliar injury occurs in all of leaves treated with acid rain at pH 2.0,whose area is larger than 20 percent of leaf area in almost half species.There are three sensitive species,seventeen resistant species and ten secondary resistant species,which account for 10.0,56.67 and 33.33 percent of thirty herbaceous ornamental species,respectively.The injury threshold values of most plants are observed at pH 2.0～3.5 designed in this experiment.However,those of Brassia campestris,Viola tricolors and Zephyranthes candida are not fixed at pH 2.0.It indicates that three herbaceous ornamental plants own astrong resistance to acid rain.The results show that the resistance of thirty herbaceous ornamental plants to acid rain is related to the change of pH value of leaf cell,showing that the change of pH value of leaf cell results in the appearant injury in leaf.
Effects of hypergravity and salt-stress on the physiological and biochemical indices of mung bean seedlings
YANG Mei-Hong, GUO Chun-Rong, WANG Jin-Sheng
2007, 15(2): 108-110.
Abstract(933) PDF(1129)
Abstract:
Mung bean(Phaseolus radiatus)seeds in germination were treated with different hypergravities for different times,and 9g/kg NaCl solution was used to imitate the salt stress on mung beans tested in the experiment.The results show that germination rate and germination index decrease with hypergravity increasing.The roots activity,content of free proline and activity of superoxide dismutase(SOD)of seedlings under 3000×g treatment are significantly higher than those under 2000×g,and the difference between 4000×g and 3000×g is not significant except SOD.The contents of malondialdehyde (MDA)of seedlings of all treatments are lower than that of the control,that of 3000×g treatment is lower significantly than that of 2000×g,those of 4000×g and 3000×g are not different significantly.Under 2000×g and 3000×g hypergravity treatments,the roots activity,the content of free proline and SOD activity of mung bean seedlings increase with the time prolongation.The treatments of 4h and 3h are not different significantly,the content of MDA decreases with the time prolongation.It is concluded that the salt tolerance of mung bean seedlings is improved by hypergravity treatment of 3000×g for 4h.
Adaptability of Cucurbita moschata Duch. seedlings to low-temperature stress
ZHOU Jun-Guo, ZHANG Yan
2007, 15(2): 111-113.
Abstract(1118) PDF(740)
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Seedlings of Cucurbita moschata Duch. with three true leaves were put in the darkness under low-temperature of 25/15℃(day/night),15/10℃,10/5℃,5/0℃ for 24 hour;and the electric conductivities of treated seedlings were measured to study the adaptability of the Cucurbita moschata Duch. to low temperature stress.The results show that the electric conductivity measured after the leaves are leaked for 60 minutes is typical.And the electric conductivity of leaves under 5/0℃ treatment can be used to distinguish the adaptabilities of different materials,indicating that 5/0℃ is the lowest growing temperature of Cucurbita moschata Duch.The adaptability varies among different varieties,and materials No 344,360,151 can be applied in the future.
Studies on rice variety diversity for sustainable control of rice blast
MA Hui-Gang, SHU Chang, LIU Kang-Cheng, LI You-Yuan, ZHU You-Yong, TU Xue-Qin
2007, 15(2): 114-117.
Abstract(1803) PDF(974)
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Field experiments of mixed-and pure-cropping of four rice varieties,including hybrid varieties and traditional high-quality varieties which had diverse genetic backgrounds,were conducted to study the controlling effects of variety diversity on the rice blast in Ji’an County and Shicheng County on the basis of analysis on resistance gene analogue and the mechanism of stabilizing function of variety diversity to the plant pathogen.The results demonstrate that the appropriate mixed-cropping of rice varieties with different genetic backgrounds has a significant controlling effect on the occurrence of the rice blast,particularly for the highly susceptible traditional varieties.A significant decrease of incidence and disease index of rice blast are observed and the control efficiency is as high as 82.14%～95.91%.The control efficiencies of mixed-cropping of hybrid rice on rice blast are 40.82%～70.87% while the yield increases by 6.03%～11.81%.
Analysis on factors affecting apple scab prevalence in Weibei semi-arid plateau of Shaanxi Province
HU Xiao-Ping, YANG Jia-Rong, TIAN Xue-Liang, LI Sui-Yuan, GAO Li-Qiang, GOU Jian-Jun
2007, 15(2): 118-121.
Abstract(1152) PDF(1055)
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Factors effecting apple scab [caused by Venturia inaequalis (Cooke) Wint.] prevalence were studied on the basis of temperature,relative humidity,rainfall and prevalent levels of diseases from 1997 to 2003 through stepwise regres-sion.Results show that the
Studies on occurrences and ecological control techniques of tomato insect pests and diseases in sunlight greenhouse
ZHANG Shu-Lian, CHEN Zhi-Jie, ZHANG Feng, TIAN Quan-Fu
2007, 15(2): 122-125.
Abstract(421) PDF(232)
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The results of investigation on the kind ,dynamics and harm of insect pests and diseases of tomato in sunlight greenhouse show that there are 35 species diseases and 16 species insect pests of tomato ,which are mainly tomato gray mold(Botrytis cinerea<
Selective toxicity of insecticides between Aphis citricola and Coccinella septempunctala
LIU Hui-Ping, HAN Ju-Cai, XU Qin, LU Chao-Jun
2007, 15(2): 126-129.
Abstract(1043) PDF(811)
Abstract:
The selective toxicity of 15 insecticides between Aphis citricola von der Goot and Coccinella septempunctala L.was investigated with a topical application method recommended by FAO.The results show that the selective toxicity of imidacloprid is the highest among 15 insecticides tested, and its selective toxicity ratio(STR, ladybird LD50/aphid LD50)is 135.56. Other insecticides with higher selective toxicity are cyfluthrin, cypermethrin and malathion, of which STRs are 114.00, 62.86 and 45.43, respectivly. Therefore these insectivides,such as imidacloprid, cyfluthrin and malathion, show a higher toxicity to the aphid but safe for the natural enemay ladybird. They coulud be selected as a relatively idael alternative for integrated chemcial and biological control of aphids in the field.
Relationships of transgenic Bt cotton variety and soil nutrients with the severity of red leaf blight
ZHANG Zhan-Bei, ZHANG Hui-Jie, DUAN Guo-Qi, WANG Xiao-Min
2007, 15(2): 130-132.
Abstract(784) PDF(824)
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The experiment was conducted in 2003 and 2004 to observe the effects of transgenic Bt cotton and soil nutrients on red leaf blight of cotton．The systemic investigations reveal that the severity of red leaf blight of transgenic Bt cotton variety is higher than that of non-Bt cotton variety, the disease incidence and index of transgenic Bt cotton variety are 47.95%～79.45% and 12.95～28.25, respectively and those of non-Bt cotton variety are 32.12%～55.06% and 9.09～15.75,respectively. Incidence reveals that a significant difference between Bt cotton and non-Bt cotton varieties(P<0.05). The ginned cotton yield and the severity of red leaf blight present no significant difference（P>0.05）among six treatments of N, P, K fertilizer combination. This result shows no significant effects of N, P, K fertilizer on reducing the severity of disease. On the basis of the results, a new theory and some new methods are discussed for the disease control.
Studies on outbreak regularity of cucumber leafminer in greenhouse in Loess Plateau
CHEN Zhi-Jie, ZHANG Feng, LIANG Yin-Li, ZHANG Shu-Lian, XU Fu-Li
2007, 15(2): 133-136.
Abstract(1145) PDF(852)
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The field investigation and lab experiment were conducted to study the outbreaking characters of cucumber leafminer in greenhouse on Loess Plateau. The results show that four species of cucumber leafminer are found in greenhouse on Loess Plateau. Among them, Liriomyza sativae is the dominant species. The insect grows for 8~10 generations per year in sunshine greenhouse. Two injurious peaks happen from mid October to late November and from late March to mid May, respectively,and the second peak is the key time to control the insect. The insect not being able to live through winter outside the greenhouse has to stay in the greenhouse. The vertical distribution of leafminers on cucumber is obviously in stratification, in mid and lower strata more than 90% of the larvae disperses. The eclosion rate of larvae is zero when the temperature is higher than 45℃ for 2 hours or the mositure of soil is 100% for 2 hours. The plantation mode, culturing area, and natural enemy are important factores affecting the population of cucumber leafminer.
Effects of El Nino，La Nina and solar activities on the outbreaks of the summer locust in Hebei Province
YAO Shu-Ran, ZHANG Wen-Zong
2007, 15(2): 137-139.
Abstract(1149) PDF(929)
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By using the method of laws of catastrophe—the Key Time Method，the relations between sunspot，El Nino as well as La Nina episodes and the outbreaks of summer locust in different ecotype areas，seashore areas and lowland areas inHebei Province were analyzed. Results show that El Nino and La Nina episodes have no influence on the outbreaks of summer locust in two ecotype areas in Hebei Province. El Nino and La Nina affect the outbreaks of summer locust mainly through inducing the weather and climate changes. And the solar activities show no obvious effects on the outbreaks of summer locust in two ecotypes areas in Hebei Province also, but there are some differences of outbreaks of summer locust between two ecotpye areas in the years fo sunspot at a peak value.
Influences of crab eco-culture in net-enclosures in East Taihu Lake on water environment
WU Wei, WU Ting-Ting, HE Jie, FAN Li-Min
2007, 15(2): 140-146.
Abstract(1347) PDF(878)
Abstract:
On the basis of on-the-spot survey and analysis of water quality in different crab eco-culture sections from April to November of 2004,the influences of crab eco-culture in net-enclosures in East Taihu Lake on water environment were appraised.The results indicate that in the control sections of water resources areas,the main factors which are beyond the standard of fishery water quality are total nitrogen content (TN) and total phosphor content (TP),but in the eco-culture sections the factors over the standard are pH and TP.So the water in the control sections is polluted by nutrient salts.The investigation also indicates that there are a lot of aquatic weeds in the eco-culture sections resulting in that the nutrient contents are much lower than those in the control sections.The results show that the crab eco-culture in net-enclosures in East Taihu Lake does not tamper with the water environment. The water quality in eco-culture sections accords with the demands of “Fishery Water Quality Standards”or“Surface Water Quality Standards Ⅲ”,and is better than that in the comparison sections.
Studies on distribution and population of amphioxus (Branchiostoma belcheri)in Maoming Dafangji sea area
XUAN Li-Qiang, LU Huo-Sheng, HE Xiu-Ling, CHEN Wen-He, CHEN Chun-Liang, ZHANG Jing
2007, 15(2): 147-150.
Abstract(1239) PDF(765)
Abstract:
The investigation indicates that amphioxus (Branchiostoma belcheri) is mainly distributed within the area with 111°10′～111°17′longitude, 21°19′～21°27′ latitude, which covers 195.5km2 in Maoming Dafangji sea areas. The average resource density is 51～86 ind/m2 the highest is 815 ind/m2. The area with a high density is centered in the west and northwest of the Xiaofangji Island. The body length distribution of amphioxus has an obvious seasonal fluctuation and the main recruit seasons are autumn and winter. The gonad maturity and sex ratio of population significantly change with seasons and growth stages and with a highest proportion of sex mature 65% in spring. Furthermore, along with the increase of the body length,the gonad maturity is increased gradually. Gonad maturity percentage is a function of binary cubic curve to the body length. Within the scope of 35～60mm of body length, the sex ratio of population approaches 1; if the body length is longer than 60mm the individuals of female are obviously less than those of male; the body length-weight relation equation of amphioxus is W=0.0012L3.32. As the body length is longer than 50mm, the reducing coefficient of amphioxus population is 0.55/cm.
Influence of different harmony functions on the harmony degree of ecology-economy-society system—A case study from Ziyang District, Yiyang City, Hunan Province
YANG Shi-Qi, YANG Zheng-Li, GAO Wang-Sheng
2007, 15(2): 151-154.
Abstract(1061) PDF(775)
Abstract:
The harmony degree of the ecology-economy-society system was analyzed by using the harmony function and a series of basic theory of evaluating the ecology-economy-society system were established including the efficacy function, harmony function, rank of harmony degree and evaluation index. Four kinds of method were constituted about the harmony function, being the geo-mean method, weighted mean method, variation method and coefficient of variation method, at the same time the rank of harmony degree was analyzed completely. Finally, the harmony theory was validated by a case study of Ziyang District, Yiyang City, Hunan Province. The result is identical with its fact in the way, so the harmony theory is scientific and feasible.
Ecological footprint studies on sustainable development of Sichuan Province
LIU Zi-Juan, ZHANG Wen-Xiu, JIA Lin-Ping
2007, 15(2): 155-159.
Abstract(1415) PDF(1190)
Abstract:
With the ecological footprint method and based on the statistical data of Sichuan Province in 2003, the ecological footprint of Sichuan Province was calculated. The results show that the ecological footprint of Sichuan Province in 2003 was 1.361hm2per cap.,while the ecological carrying capacity was 0.392hm2 per cap. On the scales of province and country, its ecological footprint had already been far beyond the available ecological carrying capacity, so the economic and social developments were in an unsustainable development state. Finally, the reasons for the high ecological deficit in Sichuan Province were analyzed and the countermeasures of how to lower the ecological deficit and realize sustainable development were put forward.
Evaluation and zoning of agro-landscape ecological function—A case study from Maping Town in Zhangpu County, Fujian Province
CHENG Jiong, WU Zhi-Feng, LIU Ping
2007, 15(2): 160-163.
Abstract(1270) PDF(1290)
Abstract:
On the base of GIS, Maping Town, Zhangpu County, Fujian Province was zoned into units to evaluate the landscape with the index of ecological function (E) as measuring parameter of agro-landscape ecological function. Every parameter and its weight were calculated and its function ratio was analyzed by using subjection function. E value of every unit is calculated. And the landscape ecological function zoning was conducted according to E frequency of every unit. The zoning results are consistent with the practical ones and provide a scientific support for the landscape ecological design.
Rural circular economy and rural full development—A case study from Fujian Province
SU Shi-Peng, ZHANG Chun-Xia, LIN Wen-Xiong
2007, 15(2): 164-168.
Abstract(1088) PDF(1420)
Abstract:
The article expounds that circular economy is a realistic option to resolve the resources and environment problems of rural development, promote the development of rural industry cluster, urbanization, coordination between county and city and development of harmony society in a case of Fujian, and then gives some suggestions according to the analysis of specialties and evolving laws of rural circular economy system.
Applicability evaluation on the natural resources of organic agriculture—A case study from Lishui County, Jiangsu Province
ZHAI Wen-Xia, WANG Shu, HUANG Xian-Jin, DU Wen-Xing, ZHONG Tai-Yang
2007, 15(2): 169-172.
Abstract(1116) PDF(1191)
Abstract:
The indexes of applicability evaluation are selected according to OFDC organic certification standards, and the applicability of natural resources is classified. The applicability of natural resources of the organic agriculture in studied area is divided into four grades: grade 1, whose environment quality is adapted to the development of organic agriculture; grade 2, whose environment quality is adapted to the traditional agriculture but is limiting to the development of organic agriculture; grade 3, whose environment quality can be suitable for the development of organic agriculture after organic transformation; grade 4, whose environment quality is not suitable for organic agriculture through organic transformation. The soil, water and atmosphere environment all have three grades and the natural resources have four grades in Lishui County. According to the evaluation, some advices are advanced.
Analysis on landscape structure of orchard and non-irrigable cropland in the typical basins of Shandong Peninsula
CHEN Ya-Lin, CHANG Xue-Li, CUI Bu-Li
2007, 15(2): 173-177.
Abstract(1161) PDF(1361)
Abstract:
Based on 3S techniques, the study compared the landscape structures of orchard and no-irrigable cropland of 16 typical basins in Yantai City by using the land-use-map of Yantai City and the Landsat TM image in Sept. 9, 2002. The percentage of landscape, patch density, perimeter-area fractal dimension and patch cohesion index were calculated by using Fragstats 3.3. The results show that though Yantai City is famous for its vegetables and fruits, the proportion of orchard is not the largest in area. Non-irrigable cropland landscapes are dominant in area and orchard landscapes are dominant in patch number. The conclusion made through comparing different landscape indices is that the average percentage of non-irrigable cropland landscape is higher than that of orchard landscape. The average, the largest and the smallest patch densities of orchard landscape are higher than those of non-irrigable cropland landscape obviously. No significant difference between orchard landscape and nonirrigable cropland landscape in perimeter-area fractal dimension is observed, but there are great changes from orchard landscape to non-irrigable cropland landscape in patch cohesion index.
Effects of land use changes on grain yield and environment—A case study from Shuangcheng City,Heilongjiang Province
ZHANG Jiu-Ming, GU Si-Yu, ZHAO Jun, MENG Kai
2007, 15(2): 178-180.
Abstract(1435) PDF(808)
Abstract:
The land use changes of Shuangcheng City and their impacts on grain yield and environment were discussed by using the spatial analysis function of GIS on the basis of Landsat data in the years of 1986 and 2000 combined with the statistic data. The results show that the areas of cropland, meadow and water decrease annually, they were 1841.15hm2, 3030.25hm2 and 70.86hm2 less in 2000 than those in 1986, while the areas of town, countryside, woodland and paddy increased by 581.78hm2, 363.91hm2, 1103.5hm2 and 2934.77hm2 in 2000, respectively. The grain yield presented an undulated increasing tendency, which was 373 thousand ton in 1982, and 1353 thousand ton in 2001, with the highest yield, 1651 thousand ton in 1998. The annual average temperature was rising and the mean precipitation was decreasing from 1957 to 2001.
Progress of ecological techniques being the source of sustainable high yield of crops—The inspiration from the high yield fields of wheat in Xiangride area of Qinghai Province after re-visiting
SUN Hong-Liang
2007, 15(2): 181-183.
Abstract(952) PDF(1033)
Abstract:
At the end of seventies of the last century a high yield record of wheat of 15195kg/hm2 was attained, with the rate of light utilization in growing season reaching actually to 5.9% in Xiangride Town of Qinghai-Tibet Plateau. What the reason of this high efficiency of light transformation is and whether it can be maintained undeclined are the problems the people are paying more attention to. The author has made an investigation on spot and found that the creative ecological techniques are the leading factors for the high-yield formation. The successful breeding of new varieties, comprehensive application of ecological technology, and establishment of land for ecology are three key supports for the high yield and sustainable development. The progress of ecological techniques as the intrinis variable of economy development in Xiangride is a successful example of creative ecological economy theory and B-model in economy.
Research progresses of ecosystem health and its assessment
CAI Yan, WANG Hui-Xiao
2007, 15(2): 184-187.
Abstract(1352) PDF(1233)
Abstract:
The research progresses on ecosystem health and its assessments were mainly introduced in this paper, including the concept of ecosystem health, the assessment methods and indexes, etc. As a case study, agroecosystem was specially discussed. Finally, the main problems and the research directions were pointed out for the future study.
Review on carbon cycle of forest ecosystem
WEI Hai-Dong, MA Xiang-Qing, LIU Ai-Qin, FENG Li-Zhen, HUANG Yi-Jiang
2007, 15(2): 188-192.
Abstract(1229) PDF(1882)
Abstract:
The carbon cycle of forest ecosystems plays an important role in the global carbon cycle, which is closely related to CO2 concentration in atmosphere and has an obvious effect on composition of atmospheric elements. The advances in the studies on carbon cycle of forest ecosystems at home and abroad are reviewed in this paper. The vegetation organic carbon and soil organic carbon pool of forest ecosystems are 359PgC and 1220PgC, accounting for more than 86% of total vegetation carbon organic pool, 73% of soil carbon pool of terrestrial ecosystems, respectively, so the forest ecosystem is a big carbon pool. On the other hand, forest community and forest soil respiration are major ways of carbon dioxide flux from forest ecosystems to atmosphere, which increase the concentration of CO2 in atmosphere to a certain extent. Soil emission represents the largest terrestrial source of CO2 to the atmosphere, which has diurnal and seasonal dynamic changes, and is affected by environmental factors such as temperature, humidity, etc., and would actively responses to the increasing concentration of CO2 in atmosphere. At present, the critical issue in understanding the global carbon cycle is the “missing sink”of CO2 in atmosphere, being 1.7PgC, which is generally thought to be located in middle latitude region of land in the earth owing to the broad distribution and high productivity of coniferous forest ecosystems. Many researches on carbon cycle models have been done based on varied hypotheses, parametric coefficients and purposes. Proposals on carbon cycle of forest ecosystems and the direction of study in future are presented, which will contribute to a better understanding on the relationship between the global climate changes and forest ecosystems.
Biodiversity in the source regions of the Yangtse River, Yellow River and Lancang River
LI Yi-Bing, YI Hua, YANG Gai-He, WANG De-Xiang
2007, 15(2): 193-196.
Abstract(1757) PDF(1402)
Abstract:
A complete acquaintance with biodiversity of the source regions of the Yangtse River, Yellow River and Lancang River will be helpful to its environment protection and construction. The west, south, southeast and northeast of the source regions of the three rivers abutting with the biodiversity center own a variety of ecosystems and corresponding ample species. The environment resulting from the upheaval of Qinghai-Tibetan Plateau is one important reason for the abundant biodiversity which is exceptional for its special species, some of which are protected by the nation.
Review on heavy metals,soil environment quality and food safety
LU Xiao-Nan, MENG Ci-Fu, MA Wan-Zhu
2007, 15(2): 197-200.
Abstract(1465) PDF(1709)
Abstract:
Of all the elements,the most important ones related to food-chain contamination are arsenic(As),cadmium(Cd),mercury(Hg),lead(Pb),and selenium(Se).This paper reviews the connotation of soil environmental quality,discusses the present status, characteristics,sources of heavy metal pollution as well as the relationship between heavy metal and food safety,and presents the methods of heavy metal pollution control.
A review on the function of ectomycorrhiza and the effects of environmental factors on them
HE Xiao-Xiang, TAN Zhou-Jin, XIAO Qi-Ming, CHEN Li-Li
2007, 15(2): 201-204.
Abstract(1438) PDF(2845)
Abstract:
The functions of ectomycorrhiza,and the effect of environmental factors on ectomycorrhiza and ectomycorrhizal fungi are discussed.Some advice on the existing problems of ectomycorrhizal research at present in our country are put forward.
Effects of exogenous IAA on physiological characteristics of roots under sea water stress during wheat seed germination
LIU Hong-Zhan, ZHENG Feng-Rong
2007, 15(2): 205-206.
Abstract(1185) PDF(975)
Abstract:
Modes of dryland ecological farming in Chengjiang County,Yunnan Province
ZHANG Shu-Bin
2007, 15(2): 207-208.
Abstract(828) PDF(871)
Abstract:

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