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东北高寒地区麦田土壤活性有机质和环境因素关系的灰色分析
苏永春, 勾影波
Grey Model Analysis for Relationship between Soil Active Organic Matters and Environmental Factors in Northeast Heavy Frigid Region of China
Su Yongchun, Gou Yingbo
生态学杂志 . 1999, (6): 28 -32 .