农田氮素流失模型的构建与应用

农田氮素流失一直是困扰农业生产发展和影响生态平衡的一个重要问题，当前世界各国致力于研究提高氮肥利用率和减少氮素损失的方法与途径，但是仍没有一个普遍适用的模型能定量化地阐明氮素流失的规律与特征。综述近年来国内外在农田氮素流失方面的定量方法与模型构建等研究成果，同时提出该领域亟待解决的问题。

The establishment and application of nitrogen loss models in the fields

The nitrogen loss has had a bad effect on agriculture production and environment for a long time. The scientists from all over the world are committing themselves on improving the utilization and decreasing the nitrogen loss, and so on. But until now, there are no fit models on explaining the process of nitrogen loss. The establishment and application of the methods and models on the nitrogen loss inland and abroad are reviewed. At the same time, the problems needed badly solving in this research field are put forward.