腐殖质是树叶被细菌和真菌迅速分解和根部表面循环过程的必需品。
Humus is necessary for rapid decomposition of leaves by bacteria and fungi and for recycling by surface roots.
这个生物质是在一个连续的分解状态下，最后生成了一种半稳定的物质叫做腐殖质。
This biomass material is in a continuing state of decomposition, ultimately becoming that semi-stable material called humus.
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.
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