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Chinese Journal of Applied Ecology ›› 1998, Vol. 9 ›› Issue (2): 150-154.

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Effect of no-tillage on energy flow in cotton agroecosystem

Ge Feng, Xie Baoyu, Ding Yanqin   

  1. Institute of Zoology, Academia Sinica, Beijing 100080
  • Received:1996-03-19 Revised:1996-12-09 Online:1998-03-25 Published:1998-03-25

Abstract: Comparative studies on the effect of conventional and no tillage methods on soil microbes, insect pests, natural enemies, cotton plants and energy flow in cotton agroecosystems show that the biomass and respiration rate of soil microbes were respectively 1.32 times and 1.63 times higher in no tillage than in conventional cotton agroecosystem. In no-tillage cotton agroecosystem, the productivity of seedling aphid (Aphis gossyppi), autumn aphid, 2nd and 4th generation cotton bollworm (Helicopavar armigera) populations was increased, but the productivity of summer aphid and 3rd generation cotton bollworm populations and the productivity and prey utilization efficiency of natural enemy populations were decreased. No-tillage could enhance the light utilization efficiency and gross production, with an additional benefit of reduced energy expense in cotton agroecosystem.

Key words: No-tillage, Cotton agroecosystems, Energy flow, national wetland park, analytic hierarchy process (AHP), protection value, entropy method, GIS analysis