川西北亚高山草甸植被及土壤变化对比分析  

Analysis on Sub-alpine Meadow Vegetation and Soil in Northwest of Sichuan

作　　者：成平[1] 李星亮[2] 干友民[1] 

机构地区：[1]四川农业大学草业科学系,四川雅安625014 [2]阿坝州科学技术研究院,四川汶川623000

出　　处：《草业与畜牧》2010年第1期9-13,共5页Pruataculture & Animal Husbandry

基　　金：教育部春晖计划项目(Z2006-1-61003);四川省科技厅项目(07JY029-024)共同资助

摘　　要：对比1982年与2007年2次亚高山草甸植被和土壤调查结果,从植物优势种、结构组成、物种多样性以及土壤营养成分等方面入手分析了红原亚高山草甸时间尺度的变化。结果表明,在过去26年里,亚高山草甸植被群落特征发生了显著变化,优势植物种垂穗披碱草、四川嵩草优势度分别从原来的25.34、26.33下降到18.74、18.25。禾本科、莎草科所占比例下降,杂类草的比例上升,同时物种多样性呈增加趋势。土壤有机质、全量养分降低,速效养分含量上升。从植被和土壤的分析研究都表明川西北亚高山草甸呈退化趋势。Investigation of the same site at different times revealed the types of temporal change in sub-alpine meadow in the aspects of dominant vegetation, structural components, species diversity and the soil nutrients. The results showed that, during the past 26 years, the change in community characters of sub-alpine meadow is significant, the dominance of Kobresia setchw aneusis and Elymus nutans Griseb reduced from the original 25.34 and 26.33 to 18.74 and 18.25 respectively. The proportion of gramineae and cyperaceae decreased and miscellaneous grasses went up, and the species diversity index increased. The contents of soil organic matter and total nutrients went down, while available nutrients went up. The analysis of vegetation and soil all showed signs of degeneration of the sub-alpine meadow in northwest of Sichuan.

关 键 词：亚高山草甸 优势度 群落结构 物种多样性 有机质 

分 类 号：S812.8[农业科学—草业科学]