紫胶林-农田复合生态系统蝗虫群落多样性

在云南绿春县采用网扫法调查了紫胶林-农田复合生态系统中稻田、旱地、天然紫胶林和人工紫胶林的蝗虫群落.共采集蝗总科（Acridoidea）昆虫1426头，5科22属，计33种.4个样地的群落物种丰富度S分别为16.333、13.000、11.000和12.000，Margalef 指数分别为2.873、2.266、2.335和2.137，Shannon-Wiener指数分别为2.034、1.976、1.982和1.488，Simpson指数分别为0.196、0.189、0.174和0.323，Pielou指数分别为0.728、0.787、0.829和0.599.紫胶林-农田复合生态系统蝗虫多样性总体较低，系统内不同农业土地利用生境蝗虫群落具有不同的物种组成及多样性特点，农田中稻田比旱地能容纳更多的蝗虫种类和数量，其蝗虫群落多样性高，均匀性和稳定性一般;天然紫胶林蝗虫群落多样性较高，群落稳定性强;而人工紫胶林蝗虫群落多样性低、群落不稳定.系统内不同土地利用生境中蝗虫群落之间存在物种的交流.

Diversity of grasshopper community in lac plantation-farmland ecosystem.

The grasshopper communities in the paddy field, dry land, natural fore st, and plantation forest of lac plantation-farmland ecosystem in Lvchun County, Yunnan were investigated by sweep netting. A total of 1426 grasshoppers belonging to 33 species, 22 genena, and 5 families were captured. In the paddy f ield, dry land, natural forest, and plantation forest of the ecosystem, the spec ies richness S were 16333, 13000, 11000, and 12000, Margalef index was 2 873, 2266, 2335, and 2137, Shannon-Wiener index was 2034, 1976, 1 982, and 1488, Simpson index was 0196, 0189, 0174, and 0323, and Pielo u index was 0728, 0787, 0829, 0599, respectively. This ecosystem had a l ower diversity of grasshop per communities, and different land use habitats in the ecosystem had different species component and diversity. In paddy field, grasshopper had a higher divers ity than in dry land, but its evenness and stability were moderate; in natural f orest, the diversity was high and the stability was strong; while in plantation forest, the diversity was low and the stability was weak. There existed species exchange in different land use habitats in the ecosystem.