复合荔枝园节肢动物群落动态的研究

对单一荔枝和复合荔枝园节肢动物群落进行了调查、分析，结果表明：复合园的捕食性、寄生性昆虫以及蜘蛛类群的数量和丰富度明显高于单一园，而植食性类群的数量和主要害虫发生数量明显少于单一园。复合园各种类型的多样性指数季节变化，其总趋势比单一园大，波动程度比单一园低。复合园的均匀度全年维持在０．８以上，而单一园的则波动很大。

Studies on dynamics of arthropod community in two kinds of litchi orchard habitats

Comparative studies on the arthropod communities between simple and complex litchi orchards were conducted in the suburb of Guangzhou.The Shannon Weiner index H' and the probability of interspecies encounter( PIE ) were used to describe and analyze the structure of arthropod communities.In the simple litchi orchard,phytophagous insects occupied 66.7% of the total arthropod community,predatory insects,parasitoids and spiders added up to 2.5% Whereas in the complex litchi orchard,phytophagous insects accounted for 42.7% of the total community,parasitoids 9.0%,predatory insects 7.9%,and spiders 12.8%.The richness of parasitoids,spiders,scavenger insects and predatory insects was higher in complex orchard than that in the simple orchard all over the year and less main pests were found in the complex orchard.The diversity indices of arthropod communities remained above 2.0 in the complex orchard and less than 2.0 in the simple orchard over the year.The higher diversity and eveness indices and less fluctuation were found in the complex orchard habitat.