近40年坝上后山地区沙漠化因子主分量的耦合波动
孙武, 李保生
The relation between coupling among the principal components of desertification factors and desertification in rear hills of Bashang since 1950
SUN Wu, LI Bao sheng
地理研究
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2002, (3): 391
-398
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DOI: 10.11821/yj2002030015