中国土壤系统分类均腐殖质特性应用中的问题和意见

Problem and Advice of Isohumic Property in Chinese Soil Taxonomy

中国土壤系统分类,以均腐殖质特性(Rh值≤0.4)作为分异特征,建立了均腐土纲。经对172个具有暗沃表层、符合美国土壤系统分类软土的单个土体进行Rh值计算,有46个不具均腐殖质特性,占26.7%,其中黑龙江省占的比例较大,达1/3,主要是由于荒地和新开垦的土地以及具寒性土壤温度状况的土壤,表层腐殖质含量高所致。将这部分发育很好的土壤归入雏形土纲,是值得商讨的。

The Isohumsols in Chinese soil taxonomy use the Isohumic property as differentiating characteristics.However,through 172 soil pedon which have mollic epipedon and accord with criterion of mollisols in US soil taxonomy,there are 46 pedon without Isohumic property（Rh value0.4）,occupy 26.7%,most of them are in Heilongjiang,caused by the richer humus in top soil layer,on account of the land cultivated lately,and have cryic temperature regime.Those mollisols（Rh0.4） included in Cambisols,this is a problems be worth discussing.