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采用Kumada法研究了不同肥力黑土及其复合体的腐殖质组成.结果表明,黑土培肥后,粉粒和细砂复合体含量增多;土壤及各级复合体游离态和结合态腐殖质含量得到不同程度提高,但游离态腐殖质的腐殖化度降低.这种作用在粉粒和细砂复合体中表现得更为明显.随复合体粒径增大,复合体有机碳含量、腐殖质提取率、游离态腐殖质含量及游离态胡敏酸的腐殖化度等均有降低趋势.胡敏酸分类结果表明,高肥土壤游离态胡敏酸均为RP型,低肥则为RP型和B型.随复合体粒径增大,游离态胡敏酸类型变化序列主要为A型(粘粒)→B型(粉粒)→RP型(细砂);无论粒径大小,结合态胡敏酸大多为A型.土壤培肥后,可使全土及各级复合体的游离态腐殖质的腐殖化度降低,进而会发生型变.在黑土中,游离态胡敏酸的型变主要体现在粉粒复合体中,结合态胡敏酸的型变主要体现在细砂复合体中.
The Kumada method was used to study the humus composition of black soil and its composites with different fertility.The results showed that after the fertilization of black soil, the content of the composite of fine granule and fine sand increased, the content of free and bound humus increased in different degree , But the degree of humification of free humus decreased.The effect was more obvious in the composite of powder and fine sand.With the increase of complex particle size, the organic carbon content, humus extraction rate, free humus content And humic acid content of free humic acid all decreased.Humic acid classification results show that high-fat soil free humic acid are RP-type, low-fat is RP type and B. With the complex particle size (A) (type of clay) → type B (type of powder) → type RP (type of sand). Most of the bound humic acids were type A, regardless of their particle size After the fertilizer, the humus of the free humus in the whole soil and the various levels of the complex can be reduced, and then the type of humification will occur.In the black soil, the type change of the free humic acid is mainly reflected in the granular composite, Morphological changes in acid are mainly reflected in the fine sand complex.