Abstract: 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.

Key words: drought stress, abscisic acid, Machilus yunnanensis