不同耕作方式下黑土有机无机复合体变化及有机碳分布特征

研究了不同耕作方式下黑土有机无机复合体组成及有机碳在各级复合体中的分布特征。结果表明：黑土有机无机复合体组成以粉粒复合体为主;黑土有机碳主要存在于小粒级复合体中,开垦有使有机碳向小粒级复合体中聚集的趋势。随着复合体粒径的增大,有机碳各组分的含量趋于减少,HA/FA比值趋于增加;腐殖质碳主要集中在粉砂粒以下的复合体中,且复合体的粒径越小,HA所占比重越大。开垦可导致土壤复合体分散,不利于HA类胶结物质向小粒级复合体中分配,轮作有利于土壤有机碳的累积,土壤物理性状的改善及土壤肥力的提高。

Organic Mineral Complex Component and Distribution Character of Organic Carbon of Black Soil under Various Cultivation Pattern

The paper studies organic mineral complex component and distribution character of organic carbon of black soil under various cultivation pattern.The results showed that organic mineral complex in black soil primarily compose by the silt organic mineral complex,the organic carbon in black soil primarily consist in the small granule diameter of organic mineral complex,there is a accumulation tendency for organic carbon to the small granule diameter of organic mineral complex,as the black soil are cultivated.The contents of organic carbon different fractions in black soil is decreasing and the ratio of HA and FA is increasing,with increasing of the granule diameter of organic mineral complex,and the smaller the particle size of complex,the greater the proportion of HA.Reclamation may cause the soil complex scattered and not conducive to cementing material HA category to arabica complexes distribution,crop rotation is conducive to the soil organic carbon accumulation of soil physical properties and the improvement of soil fertility improvement.