【Key words】 Non-point pollution； Non-point TN pollution； Export coefficient modeling approach； Correlative approach； Export coefficient； Load trend.；
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Based on the conclusion of domestic and abroad agricultural non-point source pollution research improvement, Johnes Export Coefficient Model with the feature of less-and-available data and simple calculation was selected.
本文在总结国内外农业非点源污染研究进展的基础上,选择资料易得、计算简明的Johnes输出系数法开展主要污染物负荷估算研究。
参考来源 - 宁夏灌区农业氮磷流失污染负荷估算研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A method for obtaining parameters of export coefficient model by using hydrology and water quality data is presented.
针对非点源污染模型中的输出系数模型，提出了一种基于历史水文水质资料的参数确定方法。
Nutrient export coefficient of land use is an important parameter for constructing model of non-point source pollution.
各种土地利用类型营养盐输出系数是建立非点源污染模型的重要参数。
Export coefficient method is suitable for the region where there is no enough observation data. Export coefficient is the key to improve the accuracy of estimation.
输出系数方法适用于资料比较缺乏的地区，输出系数的确定是提高估算精度的关键。
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