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土地利用方式影响流域氮输入的空间分布和氮素的迁移输出过程,与非点源污染的防治密切相关。本文利用加州San Joaquin流域数据,考虑不同土地利用方式的影响,在GIS平台上分析了流域氮输入与输出的关系及其空间分布。本文提出了一个新的指标(F=CN/(L/Q))来衡量河流氮输出的变化趋势,该指标综合考虑了田间产流和河道输移两个过程的影响因子,能够描述土地利用类型对流域氮素迁移转化的影响。在实例研究中,通过该指标能够指示出研究区氮素流失的高风险区,为流域土地利用规划和非点源污染防治提供了重要的科学依据。
The impact of land use on the spatial distribution of nitrogen input and the transport and export of nitrogen is closely related to the prevention and control of non-point source pollution. Based on the San Joaquin watershed data in California and the impact of different land use patterns, this paper analyzes the relationship and spatial distribution of nitrogen input and output in the basin on the GIS platform. In this paper, a new index (F = CN / (L / Q)) is proposed to measure the change trend of river nitrogen output. The indicator comprehensively considers the influencing factors of both farmland runoff and river course transport, and can describe the land use Effect of Types on Nitrogen Transport and Transformation in a Watershed. In the case study, the index can indicate the high risk area of nitrogen loss in the study area, which provides an important scientific basis for the land use planning and non-point source pollution prevention and control in the basin.