土壤腐殖物质一直是土壤学和环境学领域的研究热点。
Soil organic matter(SOM) is always a research focus in the soil and environmental science.
根据腐殖质与矿物质土壤的结合程度、分解作用中所含的有机物类型以及原有的植被，腐殖质可区分为几个类型。
Humus is classified according to how well it is incorporated into the mineral soil, the types of organisms involved in its decomposition, and the vegetation from which it is derived.
在这种堆肥化过程中，有机物由不稳定状态转化为稳定的腐殖质物质，用作肥料和改良土壤。
During the process the organic materials will be turned to the stable humus, which can be used as fertilizer and amend for the plant soil.
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