受控与自控棉田生态系统的能量流动研究  

Study on the Energy Flow of Cotton Field Ecosystem Controlled by Insecticide and by Nature

作　　者：竺锡武 汪世泽[2] 

机构地区：[1]湖南农科院植保所 [2]西北农业大学植保系

出　　处：《西北农业大学学报》1998年第5期76-80,共5页Journal of Northwest Sci-Tech University of Agriculture and Forestry（Natural Science Edition)

摘　　要：对陕西关中棉区受控与自控两类棉田生态系统的能量流动作了比较研究。结果表明：（１）两类棉田系统的食物网结构、营养层、生态锥体、生态效率等基本特征相似，在能量分配方面有量的差异；（２）天敌的利用效率在两类系统间有显著差异；（３）受控棉田系统的现存量与摄能量的营养级金字塔具有更快的递降率。The energy flow is studied in cotton field ecosystems controlled by insecticide and by nature in the middle district of Shaanxi.The food web,trophic levels,ecological pyramid and ecological efficiencies are similar in the two ecological systems.The two kinds of ecosystems differ greatly in preyer utilization efficiency.The energy pyramid sharpens down rapidly in the ecosystem controlled by insecticide.

关 键 词：棉田生态系统 能量流动 受控 自控 

分 类 号：S511.01[农业科学—作物学]