黄土高原部分地区严重的水土流失有自然原因也有人为因素而以后者更为突出.自然原因是黄土土质疏松夏季多暴雨极易受流水侵蚀人为原因是历史 Template




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tomski黄土高原部分地区严重的水土流失有自然原因也有人为因素而以后者更为突出.自然原因是黄土土质疏松夏季多暴雨极易受流水侵蚀人为原因是历史 coloring