Abstract: Applying x² test with 2×2 contingency table and the analysis of species diversity of the Yunnan Malong upland meadow, we learned that there are 27 spermatophyte species belonging to 12 families and 25 genera in the meadow. The dominant plants are (Zmperata cylindrica)and Potentilla fulgens. The principal species in the communities are remotely related, with a slight species diversity and low Simpson ecologic dominance index. The productivity of the upland meadow has declined and the coverage of the upland meadow fallen to 70%. Very few of the plant species are esculent. Many are poisonous and deleterious. The sum of their IV account for the overall IV is 36.29%. The meadow has been overgrazed and undergone deterioration.

Key words: Yunnan province, Upland meadow, Species diversity, Community structure, Deterioration

摘要： 对云南马龙县山地草甸植物群落进行调查并运用2×2列联表、x²检验法对该群落的15个主要植物种进行种间相关分析以及物种多样性分析。结果表明:该地区植物群落主要由27个植物种组成,隶属12个科26个属;优势种为白茅(Imperata cylindrica)和西南委陵菜(Potentilla fulgens);群落主要植物种间多呈不显著关联,群落丰富度指数低,物种多样性散失,Simpson生态优势度指数低;草甸生产力低,总盖度70%,饲用草本植物较少,出现大量有毒有害植物,其重要值之和占总重要值的36.29%,草甸呈现过牧退化现象。

关键词: 云南, 山地草甸, 物种多样性, 群落结构, 退化