水位变化作为水文机制的重要方面，直接或间接的影响人工湿地环境各种形态氮质和量的变化。
As an important aspect of hydrological processes, water-level change can directly or indirectly affect the quality and quantity of nitrogen in various forms.
在耕种、施肥、灌溉等管理措施影响下，中国农田土壤中碳库的质和量发生了较大变化，这不仅影响了土壤肥力及作物产量，而且对区域及全球环境带来影响。
Management practices of tillage, fertilization and irrigation can influence the level and quality of SOC of China, having effects on soils fertility and crop yield, as well as on global environment.
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