没有被植物吸收的营养物质和水可以被循环利用，而不是流失到土壤中。
Any nutrients and water that are not taken up by the roots can be recycled, rather than being lost into the soil.
这可以从有机物质、氮素的循环和土壤肥力因素的改善得到证明。
This could be confirmed by the organic matter and nitrogen circulation and the improvement of soil fertility.
土壤动物是生态系统中特殊的组成部分，在生态系统的物质循环和能量转化过程中起着重要的作用。
Soil animals are special composition in ecosystem that play an important role in the substance circulation and energy transform.
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