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田间条件下含水量与无机黏粒和有机质含量关系的一个用于鉴别土壤类型的诊断特性。有助于预测土壤能否放牧或支承其他负载,以及排水后土壤的沉陷程度。在美国土壤系统分类、世界土壤资源参比基础和中国土壤系统分类中都有应用。
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