广西植物2011，Vol.31Issue(6)：775-781,848,8.DOI:10.3969/j.issn.1000-3142.2011.06.013
四川若尔盖县不同退化程度高寒草地群落比较研究
Comparative study of the alpine grassland communities in varying degradation in Zoige County, Sichuan Province
摘要
Abstract
The monitoring of species diversity and evenness of alpine grassland along the degradation gradient was conducted to characterize changes of the community structure in varying degradation and suggest possible causes in Zoige County in both 2008 and 2009. The results showed that:(l)the coverage,species richness,Shannon-Wiener and Pielou indexes of species diversity of communities were decreasing from the non-degradation to the highest degradation; (2)The aboveground biomass was decreasing from the non-degradation to the highest degradation,with 836. 78 g/m2, 726. 37 g/m2 ,and 542. 78 g/m2 in fresh weight for non-degraded,moderate degraded and heavy degraded communities. The weight of dry biomass of moderate degraded communities was quite close to non-degraded communities and obvious-ly higher than heavy degraded communitiess (3)Excavating discharge ditches in 1965-1973 might be the main drivingfactor of community degradatioa Other driving factors included overgrazing,highway construction and tourism.关键词
高寒草地/退化梯度/群落结构/物种多样性指数/生物量/干扰Key words
alpine grassland/degradation gradient/community structure/index of species diversity/biomass/disturbance分类
农业科技引用本文复制引用
唐明坤,李明富,赵杰,陈薇薇,索朗夺尔基,孙治宇..四川若尔盖县不同退化程度高寒草地群落比较研究[J].广西植物,2011,31(6):775-781,848,8.基金项目
国家林业局林业公益性行业专项(200704004) （200704004）
