荔枝-牧草复合系统节肢动物群落多样性与稳定性分析

1997年9月到1998年9月在广东东莞对荔枝－牧草复合系统和单一系统的节肢动物群落进行了比较研究，结果表明，荔枝－牧草复合系统同单一系统相比节肢动物群落数量，物种丰富度及均匀性增加，多样性提高，复合系统中各类群的多样性几乎在一年中的任何时期都比单一系统要高，但不同系统各类群的多样性对夏季高温和荔枝树生长阶段的反应极不一致。利用3个指数来评价群落的稳定性，结果都说明复合系统中的节肢动物群落显得较为稳定，看来，荔枝－牧草复合系统是荔枝园中维持，保护和利用节肢动物群落多样性的一种很好的模式，用有序样品的最优分割方法，把荔枝－牧草复合系统的节肢动物群落最优划分为了5个阶段，各个阶段节肢动物各类群的多样性特征及主要害虫和天敌状态的明确能对复合系统中荔枝害虫综合防治措施的适时采用起指导作用。

Diversity and stability analyses of arthropod community in litchi-herbage complex system

The experimental orchards were located at Qiaotou town of Dongguan city,Guangdong Province,China.The litchi trees were planted between 1993 and 1994 with a distance of 3m between trees and 5m between rows.In a 2 hm 2 orchard,Desmodium intortum (Mill.Urb.),a forage legume,was planted in litchi orchard.This orchard is subsequently referred to as a complex system consisting of a litchi subsystem and a forage subsystem.In an adjacent 2 hm 2 orchard,ground cover plants (mostly weeds) were removed by farmers,an...