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作 者 ：韩广,张桂芳

期 刊 ：生态学报 2001年 21卷 7期 页码：1057~1063

关键词：风成沙丘；固定程度；因子分析；综合指数α；植被演替；

Keywords:aeolian sand dune, fixing extent of dunes, factor analysis（FA）, integrated index（ α ）, vegetation succession,

摘 要 ：用因子分析的方法确定影响沙丘固定程度的主导因素 ,并根据其共同度在总方差中所占比例来确定各主导因素的权重 ,然后对原始数据进行无量纲化处理 ,通过加权平均的方法计算出各样地沙丘固定程度的综合指数α。结果表明 :1流动沙丘的α值一般低于 0 .6,半固定沙丘的α值介于 0 .6～ 0 .7之间 ,固定沙丘的α值大于 0 .7;2单纯以植被盖度或特定植物种作为判断依据是片面的 ;3灌丛和土壤对沙丘的固定和演化起着非常重要的多重积极作用 ,应当加强对其保护和人工抚育工作。

Abstract:The study area is located in the central part of Naiman Banner,Korqin Sandy Land, a stretch of dunefield where there is a very favorable temperate climate, with the mean annual precipitation of 362 3 mm , for fixing aeolian sand dunes Nevertheless, the fixing extent greatly varies with different sites due to wide and intensive human activities (i e overgrazing, irrational cultivation, cutting woods for fuel, fencing dunes, afforestation, etc ) Therefore, this is an optimal area for studying quant...

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