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作者在群落水平上,从5个方面探讨了保护利用农田天敌的理论基础。增加农田生态系统的多样性,可以增加天敌群落种库的多样性,进而加速天敌群落的迅速重建和发展,这对控制早期迁入害虫的发生有重要意义。多样性高的天敌群落能减轻害虫发生程度,推迟害虫发生高峰的出现。群落内各子系统的相互联系和相互作用维持了天敌群落的稳定,增强了天敌对害虫的控制作用。群落多样性是影响稳定性的一个重要因素,它在一定程度上反映稳定性。
At the community level, the author explores the theoretical basis for protecting and using natural enemies of farmland from five aspects. Increasing the diversity of farmland ecosystems can increase the diversity of natural enemy community seed banks and accelerate the rapid reconstruction and development of natural enemy communities, which is of great significance to control the early occurrence of pests. The high diversity of natural enemy communities can reduce the occurrence of pests and postpone the emergence of pests. The interdependence and interaction of the subsystems within the community maintained the stability of natural enemy communities and enhanced the control effect of natural enemies on pests. Community diversity is an important factor affecting the stability, which to some extent reflects the stability.