单季稻田节肢动物群落演替规律

 运用种类丰富度、数量、申农指数等指标，对浙江省富阳市的稻田节肢动物群落的演替过程进行了描述、分析。可将整个演替过程划分为扩展期、波动期、衰减期三个时段，依据对水稻的不同作用性质将节肢动物群落分为天敌、害虫、中性昆虫三个亚群落。从以上三个指标的分析结果来看，三种亚群落的演替过程具有不同步性。相比而言，天敌亚群落具有最高的丰富度和多样性，其贡献率几乎达到50%；中性昆虫亚群落与害虫亚群落三个指标的每周累加值具有相似性，但数量消长呈负相关性。

Succession Regularity of Arthropod Community in Single-Cropping Paddy Fields

The arthropod community's succession in the paddy fields in Fuyang,Zhejiang Province, during July-October 1995 were investigated by means of the indices such as species richness, number and Shannon intlex.The results indicate that the whole succession could be divided into three phases: expanding, fluctuation and declining. The arthropod community can also be divided into three sub communities, i. e. natural enemy, insectpests and neutral insects subucommunity, hased upon their effects on rice plants. The three sub-communities' succession are asynchronous. The sub-community of natural enemy had the highest species richness and diversity witha contribution approximate to 50%. The weekly accumulative value of neutral insects and insect pests sub-community possessed similarity. However, their quantity succession is negatively correlated.