洱海流域由于独特的地貌、面源污染发生规律和农业生产方式，农田面源污染防控研究具区域特殊性。农田面源污染控制是改善洱海水质的关键，农田土壤的碳氮管理可能是遏制氮素面源污染的重要措施。本项目首先通过解剖土壤碳氮的组分学特征、化学组成及成分，明确洱海流域农田土壤中的碳氮数量、质量，明确碳氮在土壤不同库中的质量分数和数量；通过田间试验研究揭示土壤碳氮的互惠机制和逆转因素，摸清碳氮共济关系形成的内外因素，明确不同碳氮田间管理方式对碳氮共济效应的影响，探明影响土壤碳氮共济状态的关键农艺措施和环境因子；采用田间监测和模拟试验，研究在不同土壤碳氮共济情景下土壤氮素流失机制和过程，阐明碳氮调控对氮素流失的阻控机理。通过本项目研究揭示洱海农田土壤碳氮共济效应的形成机理，明确碳氮共济效应在控制氮素面源污染的过程中如何发挥作用。洱海农田土壤碳氮共济机制研究有助于为洱海流域面源污染的防治提供田间碳氮管理的理论支撑。

Agriculture non-point source pollution prevention and control research have regional characteristics in Erhai lake watershed because of its unique landscape, non-point source pollution laws and the way of agricultural production. Farmland non-point source pollution control is the key to improve the Erhai lake water quality, soil carbon and nitrogen management may be the important measures to contain nitrogen non-point source pollution. Firstly, this project will clear the quantity of carbon and nitrogen in soil, clearly define the mass fraction of carbon and nitrogen in the soil through dissection of soil carbon and nitrogen composition characteristics, chemical composition and component. Through field experiment study of soil carbon and nitrogen reciprocity mechanism and reverse factors, understanding the internal and external factors of the carbon and nitrogen fraternal relations form, clear different carbon and nitrogen management field to the effect of carbon and nitrogen in all aid, influencing soil carbon and nitrogen in all aid state key agronomic measures and environmental factors; In the field monitoring and simulation tests study the process and mechanism of the soil nitrogen loss under different soil carbon and nitrogen in all aid situation to clarify carbon and nitrogen regulation of nitrogen loss control. Erhai lake farmland soil carbon and nitrogen in all aid mechanism research will help us to provide theory support of the field carbon and nitrogen management and non-point source pollution prevention and control.