延安北洛河流域蝗虫群落结构

Structure of Grasshoppers' Communities in North Luo River Valley of Yanan

为深入寻求有害蝗虫的防治对策，2006-2007年6—9月对延安北洛河流域的蝗虫资源进行了调查。采用Shannor—Wiener的多样性指数（H）公式、Pielou均匀度指数均匀度指数（E）公式及Simpson优势度指数（C）公式，计算群落的多样性、均匀度和优势度。结果表明，不同地区、不同生境及不同月份，延安北洛河流域蝗虫群落的物种数、多样性指数值、均匀度及优势度指数值均有明显差异，主要与蝗虫赖以生存的生境类型以及气温和降水有着密切的关系。

Shannor-wiener＇ s diversity index（H）, Pielou evenness （E） and dominance（C） were calculated for the grasshopper communities in North Luo River Valley in Yanan. The results showed that the number of species, values of diversities, evenness and dominance were distinctly different regions, habits and the months. These phenomena are mainly related to habitat types as well as temperature and precipitation.