昌平区地下水氮素空间分布特征分析

对昌平平原区浅层、深层及基岩地下水的氮素空间分布特征进行了分析，从垂向和水平向对氮素分布情况作了对比，发现昌平平原区的浅层、深层及基岩层地下水中氮素含量较高，其中浅层地下水中硝态氮和氨氮含量较高，深层地下水为氨氮含量较高，基岩层亚硝氮含量较高，且从浅层到深层、基岩层．氮素含量逐渐降低。结合氮素的分布及迁移转化规律分析可知，研究区地下水氮素来源于地表含氮物质的下渗转化。

Analysis of nitrogen spatial distribution of groundwater in Changping district based on GIS

In this paper, we analyzed nitrogen spatial distribution of shallow groundwater, deep groundwater and bedrock groundwater in Changping plain area and made vertical and horizontal comparison.The result showed that nitrogen is present in the shallow, deep and bedrock groundwater, where the contaminant in shallow groundwater is mostly nitrate and ammonia, deep groundwater is contaminated mainly by ammonia, bedrock groundwater is contaminated mainly by nitrite. From shallow to deep, bedrock, nitrogen levels gradually reduce. Combined with analysis of nitrogen distribution, migration and transformation, the nitrogen of groundwater comes mainly from infiltrated surface contamination.