Analysis of the factors affecting soil nitrogen loss through runoff

This paper systematically analyzed the impacts of landform,rainfall,soil,vegetation,fertilizer and cropping system on soil nitrogen loss and introduced the latest achievements of research in this field.Based on complex interactions of the above factors,suggestions on future research on soil nitrogen loss are advanced.Firstly,experiments on multi-factor interactions and quantitative evaluation of their relationships should be done to provide scientific understanding of the basic mechanisms of soil nitrogen loss and non-point source pollution model parameters.Secondly,cooperation among various research disciplines should be enacted to establish profound theoretical basis.Thirdly,large-scale models on soil nitrogen loss should be established by conduction on field experiments and micro-runoff plots in combination with remote sensing and GIS to provide support for environmental macroscopical decision on spatial-temporal scales.