2005 Vol. 13, No. 2

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Developing circulative economy with great efforts in a realistic spirit
XIE Zhen-Hua
2005, 13(2): 1-3.
Abstract(1180) PDF(1150)
Abstract:
The feasibility of developing circulative economy with great efforts in China,and the necessity of the constructions of its theory and institution are stated.At the same time,some prior fields in developing circulative economy are put forward.
The new position and far-reaching impact of ecological province construction in our country
SHI Shan
2005, 13(2): 4-6.
Abstract(928) PDF(950)
Abstract:
The new position and importance of ecological province construction in our country are stated and its tactics,approaches and existing problems are pointed out also.
Study on the economical loss of ecological damage by the construction of express ways
ZI Chun-Xia, LI Shu-Qing
2005, 13(2): 7-10.
Abstract(1138) PDF(1399)
Abstract:
Based on the value of ecosystem services,the influence on and damage to the ecosystem by express ways construction are discussed and the indexes selection,calculation method and application conditions of economicalloss of ecological damage by the construction of express ways are studied in combination with the projects of constructed and constructing express ways in Chongqing City.Finally,the countermeasures of eco -environmental protection in the construction of express ways are put forward.
Research progress in the evaluation of sustainable agriculture
HU Chen-Xia, FU Bo-Jie, CHEN Li-Ding
2005, 13(2): 11-14.
Abstract(1218) PDF(1107)
Abstract:
The research status of evaluation indicators and methods and the existing problems of sustainable agriculture overseas and at home are analyzed.And it is pointed out that the dynamic monitoring,study of scale effect,varied evaluation and evaluating model should be strengthened and improved in the evaluation of sustainable agriculture in the future.
Analysis on the sustainability of the eco-system value—A case study from Chizhou City,Anhui Province
XU Xin-Wang, WU Xin-Min
2005, 13(2): 15-17.
Abstract(1019) PDF(873)
Abstract:
From the viewpoint of eco-economy,the capital value,the benefits of the eco-system and the economical losses caused by the ecological destruction in the Chizhou City,Anhui Province are calculated and the sustainable development potentials of the eco-economy in this region are also analyzed.
Comprehensive assessment on the agricultural ecological safety of Chongqing
SHEN Xing-Ju, CHEN Zhi-Jian, ZHANG Jin-Shan
2005, 13(2): 18-21.
Abstract(1318) PDF(1144)
Abstract:
By using hierarchical analysis process,an indicator system is set up to assess the agricultural ecological safety in hongqing.Using the mathematic model,the insecurity indexes in 1998 and 2000 are calculated.Finally,the major problems of agricultural ecological safety in Chongqing are analyzed and the development countermeasures are put forward.
Application of ‘closed-opened coupling’ theory in the eco-economy development of West China
ZHOU Sheng-Qi, JIANG Xue-Min
2005, 13(2): 22-24.
Abstract(932) PDF(933)
Abstract:
The concept and the main content of the ‘closed-opened coupling’ theory are stated and the policy implication (including investment policy,incentive policy,binding policy and personnel policy) and the practical function of the theory in eco-economy development of West China are analyzed.Finally the measures on the mode of eco-economy construction,[JP2]the ecological industry,eco-economy zone and the establishment of eco-economy institutions of West China are put forward.
Analysis on the flow direction for agricultural resources utilization at county region—A case study from Funan County of poverty-stricken region in Anhui Province
WANG Guang-Yu, HU Yong-Nian, DONG Rong, JIANG Hong-Zhi, NIE Zhong-Sheng
2005, 13(2): 25-27.
Abstract(1278) PDF(1097)
Abstract:
Based on the theory of Gray Relevant Degree,the agricultural fund,labor force,and technology progress in the flow direction of every agricultural classification were studied.The results show that the marginal benefit of fishery fund is superior;the best profession of marginal value of output for labor force is animal husbandry,and the technology progress of best require is agricultural technology progress.If the total output value of agriculture needs a steady improvement,the limited fund must flow to forestry,the surplus labor force must transfer to animal husbandry,and the attention must be paid to the agricultural technology progress.
Ecological and social effects of water used in agriculture
SUN Yan, LIN Zhen-Shan
2005, 13(2): 28-30.
Abstract(921) PDF(1079)
Abstract:
A nonlinear dynamic model of water used in agriculture-water resources-city population is established and also the ecological effect of water used in agriculture and its stability of this model are stated in the paper.The results show that the excess water used in agriculture may lead the suburb area to urbanism or the town to ruralism;the stable city population is linear to the total crops yield;with a very low irrigation rate,more water used in agriculture can not lead to the increase of crops yield,but the decrease of the crops yield and reducing of the city scale;in order to increase more agriculture～used water to increase the corps yield and to expand the city scale,[JP2]the only way is to improve the agricultural irrigation rate.
Relationship between soil charcoal in Holocene and wildfire in the Zhouyuan Region
TAN Zhi-Hai, HUANG Chun-Chang, PANG Jiang-Li, LI Ping-Hua
2005, 13(2): 31-33.
Abstract(1286) PDF(1142)
Abstract:
The relationships among soil charcoal in Holocene,wildfire and its change of ecological environment were studied.The results show that in the phase of piling of Malan loess,the climate was arid and wildfire often occurred on semi-desert grassland.During the period of soil formation,bio-pedogenic processes were so active that forests or forest-grassland formed. However,by the time of 3100aB.P,with the settlement of Zhouyuan people and human manipulation of the environment through the use of the fire,great changes had taken place,varying from natural ecology to semi-natural and semi-artificial ecology.Since 1500aB.P,the arable farmland almost disappeared,resulting in artificial ecology in place of natural ecology.For hundreds of years,with the growth of the world population,tremendous requirements of fires had increased with a large amount production of rubbish and human activities had also caused great damage to the soil environment.
Comparison of the population structures between the natural forest and the high-yield forest of Phyllostachys heterocycla cv.pubescens in Wuyi Mountain
Dong-Jin, HONG Wei, FAN Sheng-Feng, WANG Ying-Zi, LAN Bin
2005, 13(2): 34-36.
Abstract(1057) PDF(996)
Abstract:
The population structures of Phyllostachys heterocycla cv.pubescens (P.pubescens) obtained from Wuyi Mountain Nature Reserve Zone in Wiyi City and the high-yield forests in Jian'ou City were comparably analyzed.The results show that the percentages of the old age and dead bamboo are fairly high in the natural P.pubescens forest and its age structure approaches the “J” distribution while the structure of age approximates the normal distribution in high-yield forest because of the interference of farmers.The relationship between the diameter and tree height is positive in natural forest while that is not obvious in high-yield forest.The stand structure of high-yield P.pubescens forest is better than that of natural forest,and the even degree and uniform degree of high-yield P. pubescens forest are both larger than those of natural P. pubescens forest.
Studies on the cutting propagation of Taxus chinensis var.mairei.Ⅰ.Effects of medium,season and biological measures on the cutting propagation
FU Rui-Shu, HUANG Qi, Zong-Qing
2005, 13(2): 37-38.
Abstract(1051) PDF(1348)
Abstract:
Effects of medium,season and biological measures on the rooting,growth and chlorophyll content in cutting plant of Taxus chinensis var.mairei were studied.The results show that the mixture of river sand and pearl-rock at the ratio of 8∶2 is the best medium of seedling bed.The green plant rate,rooting rate and survival rate are 86.0%,84.3% and 81.7%,respectively,being significantly higher than those of the other three media.Then,the mixture of river sand and fired-soil is the second,the yellow soil is the third,and the river sand is the worst.The efficiencies of season and biological measures show that the fourth season in a year is the most optimal period for cutting propagation and significant differences are observed between seasons.Also,the cultivatioin of soybean along with cutting of Taxus is better than without cultivation of soybean and the significant difference is observed between them.
Application of molecular genetic maker techniques in Chinese fir research
WANG Xiao-Li, MA Xiang-Qing
2005, 13(2): 39-42.
Abstract(1010) PDF(1198)
Abstract:
The application of molecular marker techniques in Chinese fir is stated,i.e.the identification of genetic resource,genetic diversity research of populations,construction of genetic linkage maps,loci mapping of quantitative trait and marker-assisted selection.The problems in current research are discussed and the application trends of molecular genetic marker techniques in Chinese fir research are put forward.
Research advance in allelopathy of forest plants
LIN Wu-Xing, HONG Wei, ZHENG Yu-Shan, YE Gong-Fu
2005, 13(2): 43-46.
Abstract(1399) PDF(1559)
Abstract:
The types of forest plants possessing allelopathy,the discharging ways,types and acting mechanisms of allelopathic substances,the factors to affect the allelopathic efficiency and studying status,the ecological meaning and developmental direction of allelopathy of forest plants are stated in this paper.
RNA silencing—a new strategy for the control of virus diseases in plants
NIU Yan-Bing, GUO Shi-Mi, SONG Yan-Bo, LEI Wan-Jun, SHEN Lin-Yan
2005, 13(2): 47-50.
Abstract(1113) PDF(1581)
Abstract:
RNA silencing occurs in plants is conceived as a natural antiviral defense system that is activated as a response to double-stranded RNA (dsRNA) formed during virus replication.To compensate for the disadvantages on RNA silencing by using dsRNA to specifically interfere with virus infection in transgenic plants,several approaches of obtaining dsRNA used for virus-resistance have been developed which differ from strategies based on transgenic expression of RNAs but still rely on RNA silencing as a means to achieve pathogen-derived resistance (PDR).In this paper,the dsRNA produce strategies for RNA silencing,their applications for virus resistance,disadvantages and perspectives are reviewed.
Study on autotoxic effects of aqueous extracts from eggplant residues
WANG Fang, WANG Jing-Guo
2005, 13(2): 51-53.
Abstract(1538) PDF(1406)
Abstract:
Autotoxic effects of aqueous extracts from eggplant residues were studied. The results show that the aqueous extracts inhibit obviously its radicle growth at the concentration of 0.015g/mL. Although the embryo growth is simulated at low levels,the inhibitory effect is observed as the concentration reaches 0.075g/mL, indicating that the aqueous extracts have strong autotoxic effects on eggplant. Moreover, methanol isolatable components in aqueous extracts inhibit the growth of embryo, radicle and seedling, indicating that the methanol-dissolved components contain some autotoxic substances.The root vigor of eggplant seedling declines as the concentration of the methanol isolatable components increase. Autotoxic substances in the methanol isolatable fraction depress the uptake of NO-3、PO3-4、K＋、 Mg2+ and Ca2+, indicating that the inhibition on ion uptake is an important aspect of autotoxic effects.
Inhibition of the extractions of Stemona tuberosa Lour and Sophora flavescans on some plant pathogenic germs
WEI Ping-Ying, WANG Hu-Yin
2005, 13(2): 54-55.
Abstract(1481) PDF(1070)
Abstract:
The inhibitions of the extractions of Stemona tuberosa Lour and Sophora flavescans and their mixture on some plant pathogenic germs were studied.The results indicate that the extractions and their mixture can inhibit Bipolaris oryzae, Rhizoctonia solani, Fusarium moniliforme, Alternaria brassicae,Xanthonomas compestris var. compestris, Erwinia carotovora var. carotovora and Ralstonia soslanacearum. The inhibiting-effects of the extractions get better when their concentrations rise. The minimum inhibition concentrations of the extractions and their mixture are under 0.5mg/mL. The extractions and their mixture can also inhibit the sprouting of Alternaria brassicae's spore. Compared with the simplex extractions, the inhibiting- effects of mixture on Bipolaris oryzae and Erwinia carotovora var. carotovora get better, but there are no obvious effects on Xanthonomas compestris var. compestris, Fusarium moniliforme, and Ralstonia soslanacearum.
A primary study on the repellent activities of tree extracting solution against white ants
YI Ke-Er, LIN Jie, YE Gong-Fu, ZHANG Zhen-He, YE Zhou
2005, 13(2): 56-58.
Abstract(1223) PDF(1363)
Abstract:
The extracting solutions were derived from 83 tree species,and the repellent activities of them against white ants were tested respectively.The results show that there are not any white ants entering the chambers treated with 29 species of extracting solution after 24 hours.Considered with the factors of plant resource and the cost,18 species of extracting solutions having better repellent activities are selected primarily for the second selection test during one year.And 2 species of extracting solutions are selected finally and can be used to make new pesticides for kill white ants.Among those whose repellent activities are not obvious,based on their killing effects on white ants,the better ones are selected and can be used to provide the scientific bases in making new medicine for killing white ants.
Study on production of bio-fungicide by using maize stock
TIAN Lian-Sheng, LI Shu-Sheng, SHI Yan-Mao, ZHANG Gen-Wei, HUANG Ya-Li
2005, 13(2): 59-61.
Abstract(1203) PDF(977)
Abstract:
‘T41’，a strain of Trichodermasp.,is isolated by antagonism selection,which has suppression on the pathogen of vegetable blight.Trichobermasp.agent can be produced with maize stock powder by liquid-solid two-phase fermentation process.The suppression efficiency of ‘T41’ on several vegetable blights is high and stable and it is more efficient than that of chemical fungicides.
Monitoring of the virulence of Erysiphe graminis f.sp.tritici in different ecological areas of Shanxi Province
WU Ying-Peng, YUAN Zong-Ying, LI Yan-Fang
2005, 13(2): 62-64.
Abstract(1011) PDF(1032)
Abstract:
The frequencies of virulence genes for 61 isolates of Erysiphe graminis f.sp.triticifrom different ecological areas of Shanxi Province were monitored.The results show that pm2,Pm4a,Pm4b,Pm13,Pm20,PmXBD,Pm2+6,Pm4+8,Pm2+Mli,Pm4b+Mli and Pm5+6 are effective resistant genes to Erysiphe graminis f.sp.tritici and may be applicated as resistant parents;Pm6,Pm21,Pm2+Ta and Pm1+2+9 have applicable values in some extent;Pm1,Pm3a,Pm3d,Pm3f,Pm17 and Pm19 are little applicable value in breeding;Pm3b,Pm3c,Pm3e,Pm5,Pm7 and Pm8 have no applicable values in breeding if they are utilized as the only resistant sources.Finally,the virulence frequencies are arranged in order and the common prevailing virulent genes in different ecological areas are selected.
Effect of plucking flowers and bagging on the preventing and curing Botrytis cinerea Pers of cucumber
CHEN Zhi-Jie, ZHANG Shu-Lian, QUAN Qing-Zhuan, LIANG Yin-Li, XU Fu-Li
2005, 13(2): 65-67.
Abstract(1606) PDF(1095)
Abstract:
The systematical survey in the farm shows that botrytis cinerea Pers mainly infects the withered petals of cucumber,and the incidence accounts for 90.2%～93.0% of the total infected amount,the incidence on stigma and calyx makes up 6.9%～9.3%.The new technologies of preventing and curing botrytis cinerea Persof cucumber by plucking flowers and bagging are put forward firstly.The effects of the two measures on prevention and cure of botrytis cinerea are 80.3%～94.7% and 61.4%～95.6% respectively.The best stages of taking the measures are from blooming to 1～2d after withering and before blooming to florescence.The former stage has no evident reaction on the development of the fruits,and incidence of wilting fruits is decreased by 18.0%～20.6%.At the different developing stages of the fruits,bagging all have the effect of increasing production,and the lengths of the fruits are increased by 7.4%～10.3%,the weights increased by 6.7%～10.8%.The incidence of wilting fruits is decreased by 11.3%～30.2% by bagging before flowers wither,and abnormal fruits are decreased by 41.2%～61.6%.
Modification of the kinetic model for degradation of pesticides
SONG Ping, HONG Wei, WU Cheng-Zhen, FAN Hai-Lan
2005, 13(2): 68-70.
Abstract(1204) PDF(2475)
Abstract:
A nonlinearly effective function of biotic and abiotic factors, 1-a(c/c0）θ, was constructed. The modified model, which contains exponential decrease, the linear and nonlinear effects in pocess of degradation through adjusting the parameters by itself, is a self-adaptive model of nonlinear kinetics for degradation of pesticides. The modified model can describe the case in which the degradation curve descends in two forms of concave and convex with inflection point and can be applied to calculate the accumulative residualand the limit of pesticides used continually within the same time interval that, is applicable to a good many cases. The model shows higher fitness and accuracy than other models in the examples of practical applcation.
Relationship between incidence of Verticillium wilt on egt and nematode population in the rhizosphere soil
ZHU Jian-Lan, CHANG Yong-Yi
2005, 13(2): 71-73.
Abstract(1178) PDF(1039)
Abstract:
The results show that the relationship between nematode population in field of eggplant and the incidence of Verticillium wilt on eggplant is significant; the numbers of nematode in rhizosphere of serious symptomon eggplants are more than those of light disease eggplants and health plants; the nematodes in root of the serious disease plants are more dense than those of light disease and health ones, but there are no differences between rhizosphere and out-rhizosphere of eggplant field; the incidence of Verticillium wilt on eggplant is much seriously inoculated by the mixture of the pathogen and nematodes than only by the fungus, and the more nematodes are inoculated, the much seriously the disease is; the nematodes population inoculated by the mixture is more than that only by the fungus; the parasitical nematodes species are Tylenchu, Prathylenchus, Tylenchornychus and Aphelenchoidae.
Effect of antiｂiotics on the regeneration of sorghum shoot and the estaｂｌishment of sorghum regeneration system
LIN Feng, ZHANG Chun-Yu, WANG Hong-Yan, CHEN Dan, SHI Tai-Yuan
2005, 13(2): 74-76.
Abstract(1098) PDF(1139)
Abstract:
The effect of 4 kinds of antibiotics (Cb, Cef, Hyg, Kan) on the regeneration of sorghum shoot and the establishment of sorghum regeneration system were tested. The results indicate that the MS with glycine, Fe-EDTA and vitamin C is the best regeneration medium for sorghum shoot. Meanwhile, 250mg/L of agrobacterium is the most suitable antibiotic concentration for Cb in genetical transfrmation of sorghum shoot and the screening tactics of anti-fungus and transformed tissue are established.
Effects of in sitol and silver nitrate on the shoots proliferation of Jojoba cultured in vitro
XU Jin, WANG Yu-Zhen, LUO Jing-Lan, LIU Xiao-Jing
2005, 13(2): 77-78.
Abstract(1465) PDF(1093)
Abstract:
The Jojoba plantlets were in vitro treated by the subculture medium containing a suitble concentration of inositol and the result shows that it has a significant promotion to the shoots differentiation and leaf growth. 1～3.5mg/L of Silver nitrate significantly affects the shoots proliferation, but the plantlet height unremarkably. Exorbitant concentration of silver nitrate inhibits the plantlets growth in a certain extent,the best concentration is 3mg/L. A very significant effect on shoots growth and proliferation can be attained by using 500mg/L of inositol together with 3mg/L of Silver nitrte and the proliferation coefficient is 10.9.
Effects of salt and water stress on the seed germination of Chenopodium glaucum L.
DUAN De-Yu, LIU Xiao-Jing, LI Cun-Zhen
2005, 13(2): 79-81.
Abstract(1287) PDF(1260)
Abstract:
The effects of different salts and water stresses on the seed germination of Chenopodium laucum L. were studied. The results show that the seed germinatiｏn percentage decreases significantly with salinity or omotic potential increase when salt solution concentration is higher than 0.05 mol/L or the omotic potential of PEG sｏllutiｏns is lｏwer than -0.2MPa.Germination of seeds treated by MgSO4 is less affected and then the order is those by mixed salt, NaCl, Na2CO3,　Na2SO4 and MgCl2. In solutions with the osmoic potential of less than -0.5MPa,the seed gemination percentage is lower in NaCl than that in iso-osmotic PEG.After the non-germinated seeds from all the treatments are transferred to distilled water, the finial germination percentage indicates that a certain degrees of salt and water stress have no much effects on the seed germination pｏtential ability.Basically the germination recovery percentage increases with an increase oｏf pre-transfer salinity.The osmotic stress in which seed germination ability is not hurtful varies with the kind of solutions.
Osmoregulation changes in Casuarina equisetifolia seedlings under acid rain stress
YUAN Jian-Jun, LI Yu-Hong
2005, 13(2): 82-83.
Abstract(956) PDF(1015)
Abstract:
The osmoregulation matters were investigated in Casuarina equisetifolia seedlings under acid rain stress with a series of acidity (pH2.5～4.5)for 3 months.The results show that the soluble sugar contents in seedling twigs under acid rain stess with low acidity are lower than that of control,however,it is significantly higher under moderate and intensive acid rain stress.The soluble protein contents of the twigs increase under the treatment of acid rain,and the proline and GSH contents increase as well. The high concentration of osmoregulation matters in Casuarina equisetifolia seedlings under acid rain stress is accumulated to improve the physiological responses of osmoregulatants.
Effect of low temperature stress on some physiological and biochemical characteristics of Chinese cabbage in field
MENG Fan-Zhen, ZHANG Zhen-Xian, YU Xian-Chang, AI Xi-Zhen
2005, 13(2): 84-86.
Abstract(1292) PDF(1308)
Abstract:
Under low temperature stress, the contents of osmosis adjustment matter (OAM), malondialdehyde (MDA) and the activities of superoxide dismutase (SOD), perｏoxidase (POD),catalase (CAT) enzymes in Chinese cabbage leaves were determined. The results show that the contents of OAM, such as the soluble protein, soluble sugar, free proline increase with the temperature decreasing, but the activities of SOD, POD and CAT increase at first and then decrease. The contents of OAM among different Chinese cabbage cultivars are different.The contents of OAM of “Qiuzhenbai No. 16” and “Chundawang" are higher than those of others, which shows they have strong resistance to low temperature. Higher OAM content and higher activities of SOD, POD, and CAT are the intrinsically physiological and biochemical characteristics of Chinese cabbage to resist low temperature.
Metabolism of nucleic acid and changes of cell ultrastructure in stem apex o tea seedling induced by Cd2+
SU Jin-Wei, WANG Xiang-Ping
2005, 13(2): 87-90.
Abstract(1156) PDF(979)
Abstract:
Tea seedlings were treated for 12 days by different concentrations of culture solution with Cd2+. The results show that the ｂbiomass of the seedlings is not affected when Cd2+2+ concentration and treatment time when Cd2+ concentration is ≥0.10 mmol/L.The content of nucleic acid increases at Cd2+ level of 0.05mmol/L and decreases at Cd2+ levell ranging from 0.10mmol/L to 0.50mmol/L. RNA is more sensitive toCd2+ stress compared with DNA. The Rnase activity increases at Cd2+ level ranging from 0.00mmol/L to 0.10mmol/L and decreases at Cd2+ level ranging from 0.25mmol/L to 0.50mmol/L. The nucleus ultrastructure changes progressively with the increase of Cd2+ concentration. When seedlings are treated with 0.05mmol/L Cd2+, the nucleolus disintegrates and the chromatin condenses, the perinuclear spaces are slightly dilated. The deeply expanded perinuclear membrane contains nuclear materials at Cd2+ level of 0.10mmol/L. More serious damage is shown in the nucleus with higher Cd2+ concentrations, such as deformation of nucｌeus, shrinking ｏof nucleus, scattering of condensed chromatin and eventually disruption of nuclear membrane.
Biological effect of sodium humate on the Cd-stressed wheat seedlings
MA Jian-Jun, ZOU De-Wen, WU He-Ping, LIU Shu-Ping
2005, 13(2): 91-93.
Abstract(1095) PDF(1199)
Abstract:
Under the Cd stress conditions, the wheat seedling development and the effects on assimilation and accmulation of contamination element Cd and nutrition elements Cu, Zn, Fe and Mn in pot experiment under different sodium humate treatments such as seed soaking, irrigating and mixed manuring were studied. The results indicate that different treatments of sodium humate can mitigate the harmful effect of heavy metal Cd and improve the accumulation of dry matters in wheat seedlings. In light polluted soil, it can remarkably inhibit the assimilaion of Cd and increase the assimilation and accumulation of Cu, Zn, Fe and Mn. With the aggravation of Cd pollutiｏon, sodium humate's ability of inhibiting the assimilation of Cd weekens, and may have different effects on the assimilation of nutrition elements Cu, Zn, Fe and Mn. So the better effects of averseness resistance are shown.
Changes of N metabolismin water spinach after applying quinhydrone in soil
WANG Yu-Qi, LI Rui-Hong, YE Chen-Liang
2005, 13(2): 94-95.
Abstract(1287) PDF(1034)
Abstract:
Changes of N metabolism in water spinach after applying different levels of quinhydrone in soil were studied by pot experiment.The results show that the activities of nitrate reductase,glutamate dehydrogenase and glutamine synthetase in water spinach leaves are enhanced,the contents of total N and protein are increased, but the content of free amno acid is decreased.The suitable level of quinhydrone for water spinach in pot experiment is 20～40mg/kg.
Distriｂutiｏn ｏf zinc in sｏiｌ-crｏp systeｍ after ｌｏng-terｍ ｌｏcated appｌicatiｏn ｏf zinc fertiｌizer
WEI Xiao-Rong, HAO Ming-De, TIAN Mei-Xia
2005, 13(2): 96-98.
Abstract(947) PDF(982)
Abstract:
A ｌｏng-terｍ ｌｏcated experiｍent ｏf appｌicatiｏn ｏf zinc fertiｌizer is cｏnducted tｏ study the distriｂutiｏn ｏf Zn in sｏiｌ-crｏp systeｍ. The resuｌts shｏw that zinc can ｂe accuｍuｌated in sｏiｌ after ｌｏng terｍ continuous appｌicatiｏn ｏf zinc fertiｌizer, the avaiｌaｂｌe zinc cｏncentratiｏn in sｏiｌ is enhanced, which is higher than the criticaｌ vaｌue fｏr ssess whether Zn deficiency is occured or not.High zinc cｏncentratiｏns in crｏps and different tissues are ｏｂserved ｏwing tｏ cｏntinuｏus appｌicatiｏn ｏf zinc, ｂut their distriｂutiｏns are different. Zinc is accuｍuｌated in sｏiｌ after a ｌｏng terｍ cｏntinuｏus appｌicatiｏn ｏf zinc and zinc aｍｏunt carried ｏut ｂy the crｏp is ｏnｌy 4.11% ｏf the appｌied aｍｏunt. Sｏ, it ｍakes a pｏtentiaｌ risk fｏr sｏiｌ ecｏsysteｍ.
Infｌuence ｏf fertiｌizing ｍｏdes ｏf ｏrganic agricuｌture ｏn the sｏiｌ ｍicrｏｂiaｌ activities
LI Dong-Po, WU Zhi-Jie, CHEN Li-Jun
2005, 13(2): 99-101.
Abstract(1917) PDF(1872)
Abstract:
The infｌuence ｏf fertiｌizing ｍｏdes ｏf ｏrganic agricuｌture ｏn the sｏiｌ fertiｌizatiｏn and sｏiｌ ｍicrｏｂes activity at hｏｍe and aｂrｏad is stated. The sｏiｌ ｍicrｏｂiaｌ nuｍｂer is increased significantｌy ｂy fertiｌizing ｏrganic ｍanure, and the sｏiｌ ｍicrｏｂiaｌ pｏpuｌatiｏn structure is adjusted and cｏntrｏｌｌed, the ｂeneficiaｌ pｏpuｌatiｏn density in sｏiｌ is iｍprｏved, the ｂiｏｍasses C and N ｏf sｏiｌ ｍicrｏｂes are increased in tiｍes. It is necessary that ｏrganic ｍanure is used in ｍaintaining the sｏiｌ ｍicrｏｂiaｌ diversity and sｏiｌ ｍicrｏcｏsｍic staｂiｌity. The trends ｏf the reｌatiｏnships ｂetween fertiｌizing ｍanure and sｏiｌ ｍicrｏｂiaｌ activity are prｏspected.
Dynaｍics ｏf invertase activity ｏf ｂｌack sｏiｌ treated ｂy a ｌｏng-terｍ ｌｏcated fertiｌizatiｏn and its infｌuence
LI Dong-Po, WU Zhi-Jie, CHEN Li-Jun, ZHU Ping, REN Jun
2005, 13(2): 102-105.
Abstract(1237) PDF(1358)
Abstract:
The dynaｍics ｏf the invertase activity in the sｏiｌ with a ｌｏng-terｍ ｌｏcated fertiｌizatiｏn during the crｏp grｏwing seasｏn were studied. The resuｌts shｏw that a significant difference is fｏund in sｏiｌ invertase activity ｏf ｂｌack sｏiｌ treated ｂy high ｏrganic fertiｌizer in crｏp grｏwing seasｏn, whiｌe there is nｏ significant difference in that treated ｂy ｌｏw ｏrganic fertiｌizer. The invertase activity is graduaｌｌy increased in the earｌy crｏp grｏwing stage, and dｏes nｏt changed in the ｌate pｌant grｏwing seasｏn when the sｏiｌ is treated with cheｍicaｌ fertiｌizer ｏr withｏut fertiｌizer. The invertase activity in the sｏiｌ with ｏrganic ｍanure treatｍent is higher than that with cheｍicaｌ fertiｌizer treatｍent, withｏut fertiｌizer treatｍent, and with ｌｏw ｏrganic fertiｌizer treatｍent, it is cｏnserved ｏver 56ｍg/g·d and changes ｌittｌe in different seasｏns. The ｏrganic ｍatter can prｏtect the sｏiｌ invertase significantｌy. Significant and pｏsitive significant cｏrreｌatiｏns are fｏund ｂetween sｏiｌ invertase activity and sｏiｌ ｂiｏｌｏgicaｌ, physicaｌ and cheｍicaｌ prｏperties ｏf partiaｌ sｏiｌ in withｏut and with ｌｏw ｏrganic fertiｌizer treatｍent and ｍｏstｌy sｏiｌ factｏrs, N, P and K cｏntents ｏf pｌants.
Cｏntriｂutiｏn ｏf ｏrganic residue cycｌing tｏ the sｏiｌ ｏrganic ｍatter in red paddy systeｍ
ZHOU Wei-Jun, WANG Kai-Rong, LIU Xin, DENG Xian-Jun
2005, 13(2): 106-109.
Abstract(1138) PDF(1132)
Abstract:
Based ｏn a ｍediuｍ-ｏr ｌｏng-terｍ ｌｏcated experiｍent, the cｏntriｂutiｏns ｏf ｏrganic residue cycｌing tｏ the sｏiｌ ｏrganic ｍatter in red paddy systeｍ are studied. The resuｌts shｏw that the seｌf-returned aｍｏunt and artificiaｌ returned aｍｏunt ｏf ｏrganic residue are up tｏ 6162kg/hｍ2 and 13480kg/hｍ2, respectiveｌy; the sｏiｌ ｏrganic matter shows a decreasing trend merely depending on the self-returned organic residuce,and the deficit of soil organic matter is up to 50% or so; surplus of soil organic matter is up to 80% while all ｏrganic residues are returned. The siｍuｌatiｏn resuｌt shｏws that the cｏntent ｏf sｏiｌ ｏrganic ｍatter can increase ｂy 19.4～32.6g/kg and the increasing ratiｏ is up tｏ 83.6%～140.5% after 50 years with ｏrganic residue cycｌing.
Study ｏn the ｍeasures ｏf fｏstering fertiｌity ｏf aeｏｌian sand sｏiｌ in farｍｌand—A case study frｏｍ Ningxia Hui Autｏnｏｍｏus Regiｏn
YANG Yan-Wei, YANG Wen, ZHOU Tao
2005, 13(2): 110-112.
Abstract(996) PDF(914)
Abstract:
The ｍeasures ｏf fｏstering fertiｌity ｏf aeｏｌian sand sｏiｌ in farｍｌand are studied thrｏugh fieｌd experiｍent. The resuｌts shｏw that aｌｌ the ｍeasures ｏf fｏstering fertiｌity can increase the whｏｌe and the avaiｌaｂｌe nutrients distinctｌy, and affect the duｍpｌing structure ｏf sｏiｌ ｏｂviｏusｌy. The ｏrganic fertiｌizer treatｍent is the ｂest ｏf aｌｌ, and the capacity ｏf restraining water ｏf sｏiｌ increases. A cｏｏperative appｌicatiｏn ｏf N, P and K can increase the cｏntents ｏf ｏrganic ｍatter, avaiｌaｂｌe N, avaiｌaｂｌe P and avaiｌaｂｌe K. Cｏｍpared with fertiｌizing sｏｌeｌy inｏrganic ｏr ｏrganic fertiｌizer, the cｏｏperative fertiｌizatiｏn ｏf inｏrganic and ｏrganic fertiｌizer can iｍprｏve the whｏｌe and availaｂｌe nutrients ｏf sｏiｌ.
Iｍpact ｏf ｏrganic ｍanure ｏn the envirｏnｍent and its cｏrrespｏnding preventive researches
YAO Li-Xian, ZHOU Xiu-Chong
2005, 13(2): 113-115.
Abstract(1727) PDF(1300)
Abstract:
Dｏｍestic appｌicatiｏn practice ｏf ｏrganic ｍanure is anaｌyzed. The infｌuences ｏf ｏrganic ｍanure ｏn the envirｏnｍent ｍainｌy cｏｍe frｏｍ nitrate nitrｏgen pｏｌｌutiｏn, nｏn-pｏint P runｏff, heavy-ｍetaｌ pｏｌｌutiｏn, saｌinity stress and pathｏgen daｍage, and the cｏrrespｏnding preventive researches and cｏunterｍeasures are reviewed as welｌ.
Factors influencing the N and P loss from farmland runoff in Dianchi watershed
DUAN Yong-Hui, ZHANG Nai-Ming, HONG Bo, CHEN Jian-Jun
2005, 13(2): 116-118.
Abstract(1023) PDF(1171)
Abstract:
The present status and influential factors of N and P loss from farmland runoff were studied in 15 villages and towns around Dianchi Lake.The results show that the pollutional loads of N and P in farmland runoff in the investigated areas are very high.The mean annual discharges of N and P are different greatly,the total N is 5.07～113.16kg/hm2 and the total P is 0.15～10.14kg/hm2.Excessive application of fertilizer is the primary reason of large N and P loss,which is also related to the land use pattern,water and soil management,and farming system.The discharges of N and P vary with slopness,increase rapidly with the slopness from 6° to 12°and increase slowly with the slopness above 12°.In a rainfall or in a crop growing period,the concentrations of N and P in the runoff submit to a downtrend following the temporal process.The discharges of N and P vary with different fertilizer applications and urea and superphosphate application can reduce the N and P loss and heighten the cabbage yield.
The crop yields and water use efficiencies under different water and fertilizer conditions in the field of Black soil
MENG Kai, ZHANG Xing-Yi, SUI Yue-Yu, ZHAO Jun
2005, 13(2): 119-121.
Abstract(1328) PDF(1332)
Abstract:
Through a long-term located experiment,the crop yields and water use efficiencies under different water and fertilizer conditions in the field of black soil were studied.The results indicate that the yield of soybean more relies on the water conditions,but the corn yield more relies on the fertility.The yields and water use efficiencies of spring wheat,maize,and soybean increase along with more fertilizer under reasonable water conditions;and they also increase as soil water content goes up under manure and organic conditions.
Effect of different management patterns on the fraction of water stable aggregates and accumulation and distribution of particulate organic matter in black soil
SHI Yi, ZHANG Lu, CHEN Xin, YU Wan-Tai
2005, 13(2): 122-124.
Abstract(1184) PDF(1090)
Abstract:
Rule of accumulation and distribution of particulate organic matter and formation of water stable aggregates were studied by long-term located experiments in the typical black soil region of Songnen Plain.The results show that there are great effects of different fertilization patterns and cultivation systems on the formation of water stable aggregates.＜1mm water stable aggregates is the dominance in fraction of water stable aggregates from cultivated land.Particulate organic C exists mostly in the water stable macro-aggregates,its content decreases with the decrease of particulate levels,indicating that particulate organic C plays an importent role in maintaining the water stability of aggregates in cultivated black soil.
Characteristics and environmental impact of non-point pollution of groundwater under the high-yield farmlands of North China—A case study from Huantai County,Shandong Province
LIU Guang-Dong, WU Wen-Liang, LIU Zhong-Lan, WANG Li-Ping
2005, 13(2): 125-129.
Abstract(1319) PDF(1017)
Abstract:
Based on a case study of the typical highly yielding farmlands in Huantai County of North China,it is found that the polluted areas of non-point nitrate from farmlands develope unevenly.In a certain region, it is the flow of groundwater containing nitrate that differentiates the region into net-output and net-input zones,i.e.source zones and catchment zones.Groundwater pollution in the source zone is relatively stable but worsening in the catchment zones.The uniform spatial distribution of the polluted zones and the isolines of groundwater level strongly support an assumption that water flow decides the differential process of different polluted zones.The area of the polluted groundwater in the studying region accounts for about 56.57% of the total lands, among which 20.5% is more seriously contaminated with a nitrate concentration of 10mg/L.During a four years period,the nitrate concentration of groundwater increases by 27.2mg/L in the catchment zone, whereas the source zone keeps a little variation of 5.5～7.2mg/L. The nitrate-polluted shallow groundwater may cause the low-grade pollution of 5.8% and middle-grade pollution of 0.2% of the drinking water source, leading 38000 residents in health risk.In general,there is no inexorable correlation between the nitrate concentration of underlying groundwater and the farmland managements owing to not only the slow leaching but also the groundwater flowing.
Evaluation techniques on the losses of environmental value of groundwater nitrate pollution sourced from high-yielding farmlands in North China—A case study from Huantai County,Shandong Province
LIU Guang-Dong, WU Wen-Liang, JIN Le-Shan, Gabriel Gulis
2005, 13(2): 130-133.
Abstract(1193) PDF(1071)
Abstract:
By using the human capital approach (HCA),preventive expenditure approach (PEA) and contingent valuation method (CVM),the losses of environmental value of groundwater nitrate pollution sourced from a typical highyielding farmland,Huantai County,are evaluated.And the suitabilities of different methods for estimating the agriculture-related groundwater problems are analyzed.The precedence order of suitability is PEA by well-drilling project＞PEA by de-nitrate project≥HCA＞CVM.For the whole county in 2002,the loss of environmental value of groundwater nitrate pollution caused by farming is about 8.8 million yuan/year,ranging from 8.608 to 11.701 million yuan/year.This value accounts for 1.1%～1.5% of the gross agricultural production.
Relationships between root and shoot of winter wheat under different soil water conditions and their effects on the water use efficiency
CHEN Xiao-Yuan, GAO Zhi-Hong, LUO Yuan-Pei, LIU Xiao-Ying
2005, 13(2): 134-137.
Abstract(1162) PDF(1091)
Abstract:
Relationships between root and shoot of winter wheat under different soil water conditions and their effects on the water use efficiency of leaf(WUEL)were studied.The results indicate that the effect of soil moisture on the dry matter allocation pattern between root and shoot is little,but is great on the relationship between root function and shoot structure forming.Water stress inhibits the structure forming of plant,with the crop growing from vegetive period to reproductive period,the inconsistency between root function exerting and shoot structure forming is more and more distinct.Rewatering during the jointing stage is favorable to strengthen the function of root and improve the structure of shoot.The correlation curve between ratios of root and shoot(R/S)and WUEL is a single peak of inverse “V”figure,and water content can influence the slope and intercept of the curve.WUEL increases with the decreasing of R/S before the root biomass reaches its maximal value;WUEL arrives at the peak value when the root biomass reaches its maximal value,while the R/S is between 0.1 and 0.2.WUEL reduces with the minishing of R/S after the heading stage.
Effects of different mulch materials on the soil ecology and corn yield
BU Yu-Shan, WANG Jian-Cheng, SHAO Hai-Lin, MIAO Guo-Yuan
2005, 13(2): 138-141.
Abstract(1244) PDF(1294)
Abstract:
The results of a field experiment show that the wheat straw,mulch film,sorghum straw mat,and cardboard as mulch materials can preserve the soil moisture and especially increase the soil moisture in the upper layer (0～10cm in depth).Mulch film also has a high capacity for increasing the soil temperature,but the soil temperatures in the fields mulched with straw,mat,and cardboard are lower than those of control.All the mulch materials but cardboard increase the quantities of bacteria,fungus,and actinomyces in soil in varying degress.Microorganisms are the highest in the quantity in the soil mulched with straw.Straw,mulch film,and mat mulching treatments significantly increase the height,stem diameter,and leaf area index of corn plant.The mulch materials also have some influences on the net photosynthetic rate of corn plant in the earlier stages of its growth and development.Straw,mulch film,mat,and cardboard mulching treatments increase the corn yield by 19.4%,17.2%,16.1%,and 13.3% respectively.The direct reason of the mulch materials increasing the corn yields is mainly because of the increases of ear length and grains per ear.
Comparison research of growth development of high quality maize in Huang-Huai-Hai Plain
ZHANG Zhi-Cheng, CHEN Fu, XIE Zhong-Lun, XU Qiang
2005, 13(2): 142-144.
Abstract(809) PDF(1181)
Abstract:
Field experiment on the growth development and yield formation of the high quality maize shows that the numbers of the whole growing days of the high quality maize variety‘zhongdan 9409’and ‘gaoyou 115’are similar to those of the local variety ‘jifeng 58’,but significantly less than ‘laiyu 2’.There are no significant differences in the accumulated dry weight between the high quality maize and local maize variety,but the economic production of the variety ‘zhongdan 9409’is higher than that of ‘jifeng 58’. The lysine content of the high quality maize is significant higher than that of local maize variety.
Study on potential limit of crop yield
CAI Cheng-Zhi, CHEN Fu, SUI Peng, CHEN Jun-Sheng
2005, 13(2): 145-148.
Abstract(1581) PDF(2075)
Abstract:
The variation trends of the main crops yields in recent five decades were simulated by linear,quadratic,cubic and exponential models simultaneously.The results show that the main crops yields over years evolve in curve S trend in a long run,and their present yields are around its sharpest point.It will become more and more difficult for man to increase the crop yield from now on because cropping benefit has begun to decline.The maximal potentials of the main crops yields will probably be two to three times of their present levels.The approaches how to enhance the crop yield potential can be generalized as hydraulic infrastructure construction,breeding techniques,cultivation measures,input optimization and environmental improvement.
Buffer study on the suitable pH value of tobacco soil in part areas of Yunnan Province
QIANG Ji-Ye, ZHU Hai-Ping, ZHOU Zhen-Chun, YIN Rui-Xin
2005, 13(2): 149-151.
Abstract(1068) PDF(1117)
Abstract:
The range of suitable pH value of tobacco soil in part areas of Yunnan Province was studied.The results show that compared with 1982,the average of pH value diminishes 0.30 in 2002,accounting for 4.8% of the general average of pH value.The acidity is high in mountain soil,and the acidity changes fast in the soil of advanced areas.Ca(OH)2 should be applied to regulate the soil pH value in some areas of Yunnan Province.
Impact of land use on the emission fluxes of greenhouse gas in North-South Transection of Eastern China
LI Yu-E, LIN Er-Da, XIE Jun-Fei, YANG Zhi-Wei
2005, 13(2): 152-154.
Abstract(1270) PDF(1115)
Abstract:
The North-South Transection of Eastern China is used as a working platform for the study on the emissions and removals of greenhouse gases from forest,grassland and farmland ecosystems.
Study on hydrological response of eco-construction in a small watershed of Loess Hilly region
XU Xue-Xuan, LIU Wen-Zhao, WANG Wei
2005, 13(2): 155-157.
Abstract(1110) PDF(998)
Abstract:
The hydrological response of eco-construction in a small watershed of Loess Hilly region was studied.The results show that the soil moisture increases along the down slope direction,and the spring flow increases with the soil water content increase.When runoff happens, the spring flow may increase 3～10 days afterwards.Eco-construction is caused the decrease in runoff modules in density rainfall fairs,but fully absorbs the rainfall in a long duration with low intensity rainfall fair,showing the eco-construction can be water bearing sustainability in the test region.
Research on the restraint of the soil and water erosion of scarp cultivate land by using plants embankments in the Three Gorges area
JIANG Da-Bing, FAN Dan, GAN Xiao-Ze
2005, 13(2): 158-160.
Abstract(1206) PDF(931)
Abstract:
The composition of cultivated lands and the reason of soil and water erosion in the Three Gorges area are stated.The techniques to restrain the soil and water erosion of scarp cultivate land by using plants embankments in the area are studied also.Finally,the ways to restrain the soil and water erosion and the pesticide pollution of agriculture in the Three Gorges area are put forward.
Influences of sod culture on the soil water content,effect of soil nutrients,fruit yield and quality in citrus orchard
LI Guo-Huai, YI Hua-Lin
2005, 13(2): 161-163.
Abstract(1840) PDF(1630)
Abstract:
The influences of sod culture on the soil water content,effect of soil nutrients,fruit yield and quality in citrus orchard were studied.The results show that the average value of soil water content in planting grass plot is increased compared with that of the clean cultivation plot between July and November.At the early stage of sod culture,the effective contents of soil N,P,Ca,Mg,Mn,Cu and Zn are decreased in sod plot.However,after 2-years sod culture,the effective contents of soil N,K,Fe and Zn in sod plot are increased significantly compared with those of the check plot.The fruit yield and the content of soluble solid state material of the fruit are increased,while the citrus acid content of the fruit is decreased in planting grass plot.The better effects are in planting bahia grass plot.
Benefits analysis of bamboo-chicken agroforestry system pattern
ZHAO Xing-Zheng, LU Jian-Bo, TIAN Xiao-Ming
2005, 13(2): 164-166.
Abstract(1340) PDF(1280)
Abstract:
There are good social and ecological benefits in bamboo-chicken agroforestry system pattern.The soil erosion has reduced from 870t/hm2 per year before the system building to 2～3t/hm2 per year now;soil organic matter,total N,total P and total K have separately increased by 71%,40%,93%and 102%;at the same time 1200 person·day/hm2·year is increased.The net income of the farmer is more than 0.1 millon Yuan,including 90% from chicken subsystem.
High-efficiency complementary technologies for double-chain eco-agricultural model of forage grass-goose-fresh eatable maize
HANG Jia-Hong, WANG Shou-Hong, BAI He-Sheng, CHEN Jin-Song, GUO Jia-Deng
2005, 13(2): 167-169.
Abstract(1068) PDF(1032)
Abstract:
Double chain eco-agricultural model of forage grass-goose-fresh eatable maize and its complementary technologies are presented in this paper,and the effective linkage of growing forage grass and raising goose in order to increase the forage yield and its application rate is discussed.Then the compared benefits of forage grass-goose-fresh eatable maize model and rotation cropping of rice and wheat are analyzed.
Application of eco-techniques in installation agriculture
ZHOU Yi-Tian, CUI Shao-Rong
2005, 13(2): 170-172.
Abstract(1164) PDF(1216)
Abstract:
The importance and the prospect of the eco-engineering applied in installation agriculture are discussed.The intension of eco-agricultural models,the existing problems and suggestion in the installation agriculture are analyzed also.
Study on the temperature and energy-saving in multi-span greenhouse with simple inside thermal screen
LI Hai-Ming, CUI Qing-Fa
2005, 13(2): 173-175.
Abstract(1415) PDF(1418)
Abstract:
The temperature and energy-saving in multi-span greenhouse with simple inside thermal screen was studied.The results show that the simple thermal screen can postpone the time of starting up heating facilities for about 14 days in early winter,increases the temperature by 2.65℃ at 7:00 in comparison with the double inflated plastic greenhouse and saves 6250.5g/m2·d coal,with the energy saving rate of 38.24%.After starting up the heating facilities,the simple thermal screen increases the temperature by 2.16℃ at 7:00 in comparison with the PC greenhouse and saves 70g/m2·d coal,with the energy saving rate of 11.84%.In the greenhouse with the simple thermal screen,the illumination decreases,better than that in the double inflated plastic greenhouse and PC greenhouse.
Analysis on the sustainable development models of wetland agriculture in China
WANG Shi-Yan, YANG Yong-Xing, YANG Bo
2005, 13(2): 176-178.
Abstract(1135) PDF(1249)
Abstract:
The intension of wetland agriculture and many problems related to ecology and environment caused by unreasonable agriculture exploitation are analyzed.And three typical sustainable development models of wetland agriculture are expounded.Finally,the countermeasures of sustainable development of wetland agriculture are put forward.
Effects on the functions of ecosystem services of Dongting Lake from silt deposit and land reclamation
LI Jing-Bao, ZHONG Sai-Xiang, YANG Yan, WANG Ke-Lin
2005, 13(2): 179-182.
Abstract(1201) PDF(1529)
Abstract:
The effects on part functions of ecosystem services from silt deposit and reclamation were studied in this paper.The results show that silt deposit,reclamation,and wetland have the relationship of mutual condition,mutual reason-result and the mutual circulatory cause-and-effect.And the circulatory cause-and-effect relationship,therefore,forms the 3 ecological chain-reacting，i.e.silt depositwetland swellingoncomelania hupensis breeding,rat breeding,land deteriorate;silt depositwetland reclamationreducing of bio-resources;silt deposit and land reclamationfunction reduce of water conservancythe frequency of flooding,water pollution,the blocking of navigation lane.All of the chains weaken and/or do harm to the functions of lake services,and further reduce part of their value,namely the losses of aguatic product resources,of saving and supplying water,of adjuting and saving and biology diversities,of ecology environment and shipping,reaching 3210 million yuan,153 million yuan,4192 million yuan and 7476 million yuan respectively,with appropriate estimation of the potential value.
Research on regionalization of economic types of eco-agriculture in Shanxi Province
ZHAO Yi-Xue
2005, 13(2): 183-186.
Abstract(1017) PDF(1116)
Abstract:
The dominant and basic influential factors of ecological fragility of Shanxi Province are stated and the values of comprehensive index of ecological fragility of Shanxi Province is calculated also.Finally,five types of economic regions of eco-agriculture are classified combining the index value of agricultural economy，and the problems in classifying the economic regions of eco-agriculture are put forward.
Countermeasures of sustainable development of agriculture in Poyang Lake area
]MA Yi-Lin, MEI Li-Hui
2005, 13(2): 187-189.
Abstract(1214) PDF(1175)
Abstract:
The current situation and existing problems of natural resources in Poyang Lake area are stated and the goal and countermeasures of sustainable development of agriculture in Poyang Lake area are put forward.
The application of information technology in the manure disposal of intensive livestock or poultry
ZHAO Yu-Jie, GAO Huai-You, ZHANG Ke-Qiang, WANG Yue-Hua, SHI Rong-Guang
2005, 13(2): 190-192.
Abstract(992) PDF(1179)
Abstract:
The applications of information technology in the manure disposal of intensive livestock or poultry are introduced,i.e.making the plans of manure disposal,calculating the physical and chemical characters of manure,designing the equipment for manure disposal,assessing the environmental and economic benefits of manure disposal,and providing the technological guidance for processed manure applied in farmland.The disadvantages and perspectives of information technology applied in the manure disposal of intensive livestock or poultry are analyzed also.

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