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作 者 ：陈玉福,于飞海,董鸣

期 刊 ：生态学报 2000年 20卷 4期 页码：568~572

关键词：空间异质性；沙生半灌木群落；植被盖度；半方差分析；分形分析；毛乌素沙地；

Keywords:spatial heterogeneity, the psammophytic half shrub community, vegetation coverage, semivariance analysis, fractal analysis, Mu Us Sandland,

摘 要 ：在使用 5m× 50 0 0 m样带进行调查获得的植被盖度数据的基础上 ,通过半方差分析和分形分析揭示了毛乌素沙化草地沙生半灌木群落植被盖度的空间变异特点。半方差分析揭示出植被盖度的多尺度变异和等级斑块结构 ,在取样范围内至少存在着 3个等级。分形分析得出毛乌素沙地沙生半木群落植被盖度的分维 D=1 .90 ,接近于 2 ,指示着大部分空间变异发生在较小的尺度上 ;分段分形分析得出不同尺度范围内的分维 ,反映了空间异质性的多尺度变异性。这一结果揭示了荒漠化过程引起的生境破碎化。

Abstract:Based on the data from field investigation along a 5 km transect,spatial variant features of the vegetation coverage of the psammophytic half shrub community in Mu Us Sandland was described through semivariance analysis and fractal analysis.Nested structure of the vegetation coverage and its multiple scale of variability were revealed by semivariance analysis.There were at least three scales of variability over the sampling range.Fractal dimension of the vegetation coverage was estimated by fractal analys...

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