广西南宁地区龙眼害虫群落结构及其动态研究

根据龙眼害虫群落内部物种的组成和数量，采用群落的几个参数进行分析和探讨群落内部的演替规律。结果表明，为害龙眼的害虫有３１科６７属７６种。优势种有１３种。每年３－９月是主要害虫发生为害高峰期。是生产中防治的重要。多样性指数以５、６月份最高。２月份最低。害虫生物学特性、树龄、气候条件和生态环境等都是影响害虫群落结构的主要因子。

Structure and Dynamics of the Pest Community in Longan Orchards

An attempt was made to describe the structure and dynamics of the pest insect commu-nity in Longan (Euphoria longun ) orchards, Nanning, Guangxi. Atcording to the organiza-tion and quantity of the pest population such factors as dominance, diversity and evenness of the pest insect community are used for analysis to find out the succession within the community. Re-sults show that the pest insects under investigation includes 5 orders, 3l families, 67 genera and 76 species. There are 13 dominant species in the total pests. The infection peak occurs mainly in March to September each year- The diversity index is the highest in May and June (H' = 3 . 75), and the lowest in February (H' = 0. 55). The major factors affecting the structure of pest com-munity embrace pest biological characteristics, tree age, climate and ecosystem.