瘠薄红壤中有机物质的分解特征

通过田间定位试验观测，研究了瘠薄红壤条件下主要有机物质的分解速率和过程特征及控制因素。结果表明：瘠薄红壤中有机物质的分解速率较慢，不同有机物质的腐殖化系数在0.28-0.64之间，平均为0.45，此值约比一般红壤高34%；这与瘠薄红壤粘粒含量较高，酸度较大，原土有机质含量低有关，但在红壤地区导致有机物质分解速率差异的土壤性质诸因素中，土壤酸度占主导地位，其次是原土有机碳含量，瘠薄红壤中有机物质的分解速率在第1年比一般红壤中慢，第2年反而分解较快，其后这种差异逐渐缩小，瘠薄红壤条件下每100kg有机物质每年所能形成的土壤有机质量约在30kg左右，因此，适当施用有机肥可以较快地增加瘠薄红壤的有机碳含量。

Characteristics of Organic Materials Decomposition in Infertile Red Soils

There is currently much interest in the dynamics of soil organic matter, which is closely related to sustainable agricultural development and global warming. The infertile red soils distributed widely in South China are important resources for agricultural exploitation in the future and can sequestrate potentially large amounts of atmospheric CO 2. This paper deals with the rates, process characteristics and controlling factors of the decomposition of the representative organic materials in the inferti...