棉田生态系统中害虫、天敌群落结构与功能关系的研究

为探讨生物群落结构与功能的关系，有效地开展棉田害虫、天敌的生态调控，作者在系统调查与测定华北棉区８种不同时空类型棉田害虫、天敌群落物种丰富度、总个体数、能流量多样性指数及群落生产力的基础上，分析了各类型棉田害虫、天敌群落结构与功能的关系，总结了如下的一般规律：１）上一营养层（棉株或害虫）的生产力越高，其所支持的下一营养层（害虫或天敌）群落的总个体数和生产力增加；２）害虫群落的物种丰富度与其群落生产

STUDIES ON THE CORRELATION BETWEEN THE STRUCTURE AND FUNCTION OF INSECT PESTS COMMUNITY AND NATURAL ENEMIES COMMUNITY IN COTTON AGROECOSYSTEMS

Based on the systematical investigation and determination of specieses richness, total individual numbers, diversity indices and production of insect pests comunity and natural enemies community in eight different cotton agroecosystems, the correlation between their structure and function was analysed. The results show: 1) with the enhancement of production in higher trophies, the total individual numbers and community production of insect pests or natural enemies increased, and their diversity indices fluctuated, 2) insect pests community production increased when their total individual numbers increased and its diversity indices decreased, but no significant correlation was founded between their species richness and community production, 3) natural enemies community production increased with the enhancement of its specieses richness and total individual numbers, the correlation between its production and diversity indices were found to be very complex. The theory on the correlation between the structure and function in ecocybernetics of cotton agroecosystems as well as its application to regulation of insect pests and natural enemies of the ecosystem were also discussed.