高寒矮嵩草草甸不同退化演替阶段植物群落地上生物量分析  

Study on the aboveground biomass of plant communities among the stages of regressive succession in alpine Kobresia humilis meadow

作　　者：李海英[1] 彭红春[1] 王启基[2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [2]中国科学院西北高原生物研究所,青海西宁810001

出　　处：《草业学报》2004年第5期26-32,共7页Acta Prataculturae Sinica

基　　金：中国科学院知识创新工程项目(KSCX-1-07);国家自然科学基金项目--中国西部地区陆面同化系统研究(90202014);中国科学院寒区旱区环境与工程研究所知识创新工程项目(2003102)资助。

摘　　要：通过对高寒矮嵩草草甸不同退化演替阶段植物群落的研究显示,随着退化程度的加重,群落的组成和优势种等发生了很大的变化,植物群落从以禾本科为主,向以杂类草为主的群落演替。中度和重度退化样地与原生植被样地的禾草类、莎草类以及群落总生物量差异极显著(P<0.01)。随退化程度的加深,禾草类、莎草类等优质牧草比例下降,取而代之的是杂类草,其比例明显升高,在群落中占据优势地位。The results of the study on the plant communities among the stages of regressive succession indicated that the dominants and components of the communities changed with the aggravation of degradation, and the plant communities changed from the grass family-dominant community to the forbs-dominant one. The above-ground biomass of grasses, sedges and communities among primary plot, moderate-degraded plot and heavy-(degraded) plot showed significant difference. The proportion of the fine forages such as grasses and sedges decreased with increase in regressive succession, that of the forbs got higher instead, and in the communites the forbs were dominant.

关 键 词：高寒矮嵩草草甸 植物群落 退化演替 地上生物量 

分 类 号：S812[农业科学—草业科学]