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土地利用方式对流域氮输入输出关系的影响以加州SanJoaquin流域为例

DOI: 10.11820/dlkxjz.2010.09.009, PP. 1081-1086

Keywords: San,Joaqnin流域,河流氮输出,流域氮平衡,土地利用

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Abstract:

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SanJoaqnin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。

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