1998 Vol. 6, No. 3

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1998, 6(3): 1-6.
Abstract(760) PDF(1098)
Abstract:
1998, 6(3): 7-10.
Abstract(806) PDF(969)
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1998, 6(3): 11-12.
Abstract(848) PDF(894)
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Human,nature and society--Thinking on ecological paradox
Ye Qianji, Fan Dalu, Xie Daiyin
1998, 6(3): 13-16.
Abstract(934) PDF(52)
Abstract:
The ecological paradox,its phenomena and characteristics are expounded. The components of ecological system and the causes generating the ecological paradox are analysed. Some concrete countermeasures are provided to eliminate the ecological paradox.
Agro-ecological importance and research progresses of rape seed glucosinolates
Wang Qingren
1998, 6(3): 17-20.
Abstract(1043) PDF(1105)
Abstract:
The essential composition, main physinlogical function of glucosinolate and its adverse effects used as stock food wlth excessive content in oilseed rape(B．napus)，and some ecological problems caused by breeding are discussed．Major factors affecting glucosinolate levels，self-protection to diseases or pests，agro-ecological significance and developmental potentials of g1ucosinolate in cruciferous are also put forward．
Greenhuse gases and their ecological effects
Shen Hong, Cao Zhihong
1998, 6(3): 21-24.
Abstract(881) PDF(940)
Abstract:
The ecological effects of major greenhouse gases such as CO2，CH4,N2O，SO2，CFCs et al．are analysed．The resahs show that their ecological effects are related to their properties and concentrations in atmosphere．Some efective countermeasures for damping the emission of greenhouse gases are put forward．
Ecological effects of grassy fibre film mulch on spring corn field in dry1and
ZhongZhaozhan, Zhao Jubao, Mei Xurong
1998, 6(3): 25-29.
Abstract(856) PDF(822)
Abstract:
According to the field information from the place located in Shouyang County，Shanxi Province，a new kind of field mulch-Grassy Fibre Film Mulch(GFFM)on spring corn in dryland and its effects on soil pysieal and chemical features，soil temperature，soil water condition and the growth of spring corn are studied.The results indicate that the GFFM can improve soil structure，harmonize relations among soil temperature，soil water condition and crop deve1opment，decrease soil evaporation，and raise crop water utilizationefficiency．Under GFFM condition，the amounts of soil water storage and supply are increasedby 14．9mm and 14．6mm respectively，crop water consumption is decreased by 9．2% ，the coefficientof crop water consumption decreased by 32．3% and the efficiency of soil water utilization raised by 47.5% compared with the contro1．The water-saving and yield-raising efficiency of GFFM is obvious，so the GFFM is one of the effective ways to solve the problem such as drought and barren land in the dry farming areas in Northern China．
Effects ot mulch and ridge plant on dayland millet field at fallow stage
Zhao Ronghua, Huang Mingjing, Li Ping
1998, 6(3): 30-32.
Abstract(1384) PDF(857)
Abstract:
The experimental results show that dryland millet with mulch at the fallow stage can make the spring rainfall used in Autumn．With the method，the moisture content of soil is effectively increased，the rate of seedling emergence of millet raised，the metabolism improved,and the yield increased by 28．2%．The millet physiological changes are discussed，which provided scientific basis for the millet cultivation in dryland．
A preliminary study on the regulated deficit irrigation system of winter wheat
Zhang Xiying, You Maozheng, Wang Xinyuan
1998, 6(3): 33-36.
Abstract(893) PDF(878)
Abstract:
Field results at Luancheng Agro-ecosystem Station，CAS show that the most sensitive stage to water stress for winter wheat falls on jointing ，then the following are booting and heading to flowering stages，while too much water supply during turning green to lifting will reduce winter wheat yield．The critical levels of soil water content for winter wheat are no less than 65% of field capacity for 0～50cm soil layer during jointing stage，60% for 0～80cm during booting to heading and 60% for 0～OOcm during heading to initial milky stage，50% for 0～lOOcm during milky stage，respectively．At those stages，when soil water content is below the critical level，yield will be greatly reduced．Based on the results，regulated deficit irrigation system is established for winter wheat．
Maaure supply in organic faming
Yang Yonggang
1998, 6(3): 37-38.
Abstract(999) PDF(57)
Abstract:
The basic concept of organic agriculture，the special requirement of organic farming to manure and the present situation of manure resources in China are expounded briefly．The way of developing manure resources for propeling organic farming forward are stated.
Effects of plant residues on soil structure
Sun Haiguo, Lei Huanqun
1998, 6(3): 39-42.
Abstract(2036) PDF(1397)
Abstract:
The effects of organic manure,tstraw-paper-pulping waste using ammonium sulphite(SWUA)and chemical fertilizer on the soil structure of sandy Loamy paddy are studied．The resu]ts show that the soil porosity．water-stable aggregate and water-holding ability of organic manure treatments are significantly higher than those of other treatments among organic manure treatments，plant residue is the most favourable to improve soil structure，and the diameter of pore in which water can most actively move is O．O5～O．1Omm among capillary．There is a significant linear relationship between the porosity 0．O5～0．10mm in diameter and the water-holding capacity of soil．
Flowsand moving patterns in semi-arid ad semi-humid region—A case study from Yucheng City of Shandong Province
Zhang Xiaoyou
1998, 6(3): 43-46.
Abstract(745) PDF(758)
Abstract:
Taking Yucheng City，Shandong Province as an example,the reasons and the characteristics of flowsand moving and the harms to the agricultural production in semi-arid and semi-humid areas are analyzed．The flowsand moving patterns are approached．The resuits provide scientific basis for controlling fiowsand and establishing agro-ecological system．
Effects of exogenous sugar on rooting of poplar tube plantlets by air culture method
Feng Xuezan, Wang Yuzhen, Chen Wenlong
1998, 6(3): 47-49.
Abstract(795) PDF(946)
Abstract:
The percentage and quality of rooting are significantly improved when the tube plantlets are treated by exogenous sugar before rooting by air culture method．The results shoW that exogenous sugar treatment increased sugar，starch and protein contents in stem section，which guaranteed the carhohydrate supply and enzyme activity．
Characteristics of energy input and output in fruit tree-grain crop lntercropping ecosystem--A case study from dry valley region in the upper reaches of the MinJinng River
Bao Weikai
1998, 6(3): 50-54.
Abstract(1007) PDF(1034)
Abstract:
Characters of energy input and output for three typical fruit tree-graln crop intercropping ecosystems in the upper reaches of the Minjiang River are studied．The resuits show that the eficiency of the supplementary energy input is only 1．15～1．52 because of the irrational structure of the energy input．The light use eficiency for the three systems are 0．661%～1．205%．which is higher than single planting．Optimal management such as optimizing the components and structures of the system．improving the supplemental energy input and level，returning non-edible products and utilizing food chain cyclically should be carried out．
0ptimal models of agro-forestry ecosystem—A case study from Raoyang County of Hebei Province
Zhang Junying, Wu Bingqi, Liu Yamin, Yang Zhihan, Cai Shuangqun
1998, 6(3): 55-58.
Abstract(934) PDF(892)
Abstract:
Feasibilities,economic benefits,configuration techniques and application connditions of optimal models of five agro-forestry ecological systerm in Raoyang Experiment Zone of Hebei Province are analysed，Their order of net income is the early fruit orchard intercropping>fruit tree-grain crop intercropping>agro-forestry intereropping>forest belts farmland>forest-animal husbandry combinational system．The ratio of output／input is adverse to the net income except agro-forestry intercropping
Typical models of eco-agriealtural construction in water net plain—A case study from Deqing County,Zhejiang Province and Honghu City,Hubei Proviince
Li Quansheng, Wang Zhaoqian, Bian Zhuoping
1998, 6(3): 59-61.
Abstract(1058) PDF(850)
Abstract:
Based on the characteristics of eco-economy in the water net plain,and typical experienee in Deqing County and Honghu City，which are one of the national eco-agricultural demonstration areas,four typical models in the areas ar given,and ecoeconomica1 significance are approached，providing an effective route for agricultural sustainable development in this region．
System analysis of typical models of eoo-agricultural construction in Taihang Piedmont--A case study from Luancheng County of Hebei Produce
Lu Fubao
1998, 6(3): 62-65.
Abstract(1248) PDF(873)
Abstract:
System analysis of five typical eco-agricultural models in Taihang Piedmont is car-ried out．Energy flow of those agro-ecosystem is calculated，some ecological features are evaluated，and their efficiencies are compared．
Strategies on agricultural sustainable development in China
Lu Jianfei, Wang Jiange, Gao Deming, Wang Zhao
1998, 6(3): 66-69.
Abstract(1238) PDF(1111)
Abstract:
Based on the analysis of feasible ways and limiting factors to agricultural sustainable development in China，the results suggest that the development should rely on scientific and technical progresses，improving market environment of agricultural operation，establishing a set of mscro-control systems favourable to sound development of agriculture，enhancing agricultural comparative benefits，pursuing high input．high efficiency and high benefit.
Modern bio-technique and agricultural sustainable development
Han Donge
1998, 6(3): 70-72.
Abstract(921) PDF(822)
Abstract:
Agricultural sustainable development is a way of future aricultural development. Some effective ways about developing modern bio-technique are suggested through analyzing contribution of modern bio-technique to agricultural susainable development.
Ecosystem situations and developmental countermeasure of tea gardens in China
Liao Wanyou
1998, 6(3): 73-75.
Abstract(1271) PDF(1064)
Abstract:
The main problems on ecosystem of tea gardens in China are analyzed, and the characteristic，index，optimal configuration and ecological effects are expounded． In addition, the developmental countermeasure for establishing benign cycle artificial tea gardens ecosystem are raised．
The preliminary practice on eco-agriculture engineering construction
Shi Zhicheng, Zhao Huairen
1998, 6(3): 76-80.
Abstract(939) PDF(957)
Abstract:
Basic experiences on implementing the eco-agriculture engineering construction in ten townships and one district of Shaanxi Province from 1989 to 1995 are analysed briefly．Six different those models and twelve supporting techniques are put forward．Their ecological，economic and social benefits are also analyzed．

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