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地理学报  2004 

呼伦贝尔沙地沙丘砂来源的定量分析—逐步判别分析(SDA)在粒度分析方面的应用

DOI: 10.11821/xb200402004, PP. 189-196

Keywords: 内蒙古呼伦贝尔,粒度分析,逐步判别分析,沙丘砂,海拉尔组砂,河流冲积砂

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Abstract:

以呼伦贝尔沙地砂物质的粒度分析资料为基础,利用两组间的逐步判别分析(SDA)来筛选决定不同沉积物间差异的主导因子,根据主导因子的个数、Mahalanobis距离D2、通过统计学检验的信度?琢等3个因素,来定量地确定两个总体间的相似性大小。分析结果表明呼伦贝尔沙地的风成沙丘砂主要来源于海拉尔组砂(Q3),但河流冲积砂和古土壤也有不可忽视的作用;在嵯岗镇附近及其以西的海拉尔河下游宽阔河谷中,自然条件下河流冲积砂也可以成为风成沙丘砂的主要沙源。

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