humus
英 美
The rock pieces mix with humus.
岩石碎片与腐殖质混合在一起。
The Black Death of 1348 was caused by gradual loss of the humus fertility found under forest trees.
1348年的黑死病是由森林树木下腐殖质的逐渐丧失引起的。
humus is necessary for rapid decomposition of leaves by bacteria and fungi and for recycling by surface roots.
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。
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