高寒草甸物种多样性和生产力对养分添加的初期响应
Initial Response of Species Diversity and Productivity to Nutrients Addition on Alpine Meadow

以高寒草甸为对象，通过N、P、K及其不同养分组合的添加处理，研究养分添加对高寒草甸生态系统物种组成、物种多样性和生产力的影响。结果表明：养分添加改变群落物种组成和群落中的优势种，除P、K单独添加外，其他养分及其组合添加使草地群落物种丰富度显著减小，物种多样性和均匀度变化不大；N、P及其不同养分组合添加极显著增加群落地上生物量；N、P是高寒草地生态系统草地生产力的主要限制性养分，人为输入土壤养分将在短期内影响高寒草地生态系统的物种组成、物种多样性以及生产力。
Species diversity and productivity are the important indices of the structure and functioning of ecosystems. With an alpine grassland as tested object, this paper studied its species composition, species diversity, and productivity under effects of different nutrients (N/P/K) and their composition addition. Nutrients addition altered the species composition and the dominant species in the community. The species richness decreased significantly in different nutrients and their composition addition except P/K adding lonely. The diversity and evenness had little change. Aboveground biomass of community increased significantly under N/P and their different composition. N and P are main limited nutrients of productivity in alpine grassland eco-system. It indicates that artificial soil nutrients inputting would affect the species composition, species diversity, and productivity of alpine grassland ecosystems.