Therefore, study on classification and evaluation of soil function is necessary.
因此，对土壤功能的分类与评价进行研究显得尤为必要。
Moreover, some have been found to have a valuable function in building up soil fertility.
此外，已经发现一些在提高土壤肥力方面有重要作用。
The city soil is composed complicated, and has already changed whose natural function;
城市土壤构成因素复杂，已改变了其自然性能；
The city soil is composed complicated, and has already changed whose natural function;
城市土壤构成因素复杂，已改变了其自然性能；
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