城乡交错带复杂面源污染边界效应及模型改进研究

城乡交错带是快速城市化背景下位于城市与乡村之间的过渡性区域，兼具农业面源和城市面源污染特征，其复杂面源污染已成为水体富营养化的主要驱动因素之一。城乡交错带内土地利用空间异质性导致存在“农业/城区源区”边界效应，目前尚无合适的模型用于复杂面源污染的准确模拟。针对这一问题，本项目拟选取位于城乡交错带的汤逊湖流域作为研究区域，从土地利用空间异质性出发，定量研究“农业/城市源区”边界效应对磷素迁移转化的作用机制，在此基础上结合GIS空间分析技术和源代码修改等方法改进HSPF模型，开发反映边界效应的城乡交错带复杂面源污染机理模型，并进一步准确模拟多情景下的磷复杂面源污染负荷时空变化规律。该项目的实施将丰富我国面源污染的研究内容，研究成果对于控制城乡交错带复杂面源污染、改善城乡环境具有重要的理论意义和实用价值。

Urban-rural fringe is a special transitional zone under the context of rapid urbanization, characterized by mixed urban and agricultural non-point source (NPS) pollution. Complex NPS pollution of urban-rural fringe has become one of the major driving factors of water eutrophication. The spatial heterogeneity of land use in this area triggered the border effect on the border of agricultural and urban NPS region, and there is no suitable model for accurate simulation of complex non-point source pollution till now. Aimed at this issue, this project chooses the Tangxun watershed as research area, and plans to conduct quantitative study on the mechanism of urban-rural border effect on phosphorus transport and transformation in terms of spatial heterogeneity of land use. Based on the mechanistic analysis, combining GIS technology and source code modifications, the complex NPS mechanism model improved from Hydrologic simulation program-fortran (HSPF) will be developed to accurately simulate the spatial-temporal change of phosphorus load. This project will enrich the research contents on NPS pollution in china, and its research findings will possess vital theoretical significance and practical value for controlling NPS pollution and improving living environment in urban-rural fringe.