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江苏西南部黄棕壤上发育的马肝土及苏北草甸沼泽土上发育的黑粘土是两种代表性水稻土,对其腐殖质组成和性质进行了分析测定。结果为:1.在两种水稻土中,游离松结态和紧结态腐殖质的含量都高于稳结态腐殖质的含量;2.马肝土的胡敏酸碳/富里酸碳比值较黑粘土为低;3.光密度及絮凝极限值表明,马肝土胡敏酸的芳环聚缩程度低于黑粘土,前者胡敏酸的分子结构较后者简单。
Maotian soil developed on the yellow brown soil in southwestern Jiangsu Province and black clay developed on the meadow soil in the Northern Jiangsu Province are two representative paddy soils, and their humus compositions and properties were analyzed and determined. The results are as follows: 1. In both paddy soils, the contents of free pine and tightly bound humus were higher than those of steady-state humus.2. The ratio of humic acid to fulvic acid Clay is low; 3. The optical density and flocculation limit values show that the degree of aromatic ring polycondensation of humic acid is lower than that of black clay, and the former has the simpler molecular structure than the latter.