论文部分内容阅读
根据荔枝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变规律。结果表明,在南宁市郊为害荔枝的害虫有7目30科76属83种。初步确定优势种为14种。优势度指数每年3～9月D值高达0.8以上。多样性指数以5、6月份最高(H′=4.1),2月份最低(H′=0.95)。害虫生物学特征、树龄、气候条件和生态环境等都是影响害虫群落结构及动态的主要因素。
According to the composition and quantity of species in the litchi pest community, several parameters of the community were used to analyze and discuss the evolution law within the community. The results showed that there were 83 species, 76 genera, 7 orders, 30 families and 7 pests in the suburbs of Nanning. Preliminary identification of 14 dominant species. Dominant index 3 to 9 months a year D value of up to 0.8 or more. The diversity index was highest in May and June (H ’= 4.1) and lowest in February (H’ = 0.95). Biological characteristics of pests, age, climatic conditions and ecological environment are the main factors affecting the structure and dynamics of pest communities.