The structure and dynamics of pest insect communities in jujube sites of different intercropped systems
不同间作枣园害虫的群落结构与动态(英文)

Studies on the structure and dynamics of pest insect communities in five jujube sites with different Intercropped systems were conducted in the suburb of Taigu County, Shanxi Province, China from 2000~2002. There were different numbers of families, species and individuals of pest insects, as well as different indices of diversity, evenness and Berger-Parker in the jujube sites of different intercropped. There were larger (p<0.05) numbers of families and species in the jujube site with herbage and weeds than in those with wheat, soybean and mono-cultivated jujube site. The smallest (p<0.05) numbers of pest insect individuals were found in the jujube site with herbage and weeds, the largest (p<0.05) in the mono-cultivated jujube site. Larger (p<0.05) indices of Shannon-Wiener and evenness were recorded from the jujube site with herbage and weeds than in those with wheat, soybean and the mono-cultivated jujube. However, larger (p<0.05) indices of Berger-Parker were in the mono-cultivated jujube site than in the other four jujube sites. The temporal dynamics of the insect pest individuals went through continuous change with the change of seasons. There were larger (p<0.05) numbers of insect pest individuals from April to August than in March, September and October. The results suggested that intercropped crops, herbage or properly remaining weeds were beneficial not only in making full use of field space but also in reducing the number of insect pest individuals and increasing net income in the jujube sites.