同位素溯源解析地下水库对地下水氮分布影响  

Analysis of influence of underground reservoir on nitrogen distribution through tracing of isotope source

作　　者：康萍萍[1] 许士国[1] 禹守泉 

机构地区：[1]大连理工大学水利学院水环境研究所,辽宁大连116024 [2]莱州市水务局,山东莱州261400

出　　处：《水资源保护》2016年第5期79-84,90,共7页Water Resources Protection

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB430403)

摘　　要：以山东省王河地下水库为研究对象,利用氮氧双同位素分析地下水库的氮分布特征、来源以及转化过程,并利用IsoSource软件计算了不同污染源对地下水的贡献比例,进而分析地下水库对地下水中氮分布的影响。结果表明:库区内地下水中NO_3^-和TN浓度高于库外地下水,并且空间差异性小,地下水氮来源以化肥为主;库区内地下水中存在着反硝化过程,库区外地下水氮来源以海水养殖和化肥为主;地下水库阻隔了氮的水平流动,造成库区内地下水中氮的累积,进而增强了氮的反硝化作用。Taking the Wanghe River Underground Reservoir in Shandong Province as an example,we used nitrogen and oxygen isotopes to analyze the distribution,sources,and transformation of nitrogen in groundwater. We used the Iso Source software to calculate the contribution ratios of different pollution sources,in order to analyze the influence of the underground reservoir on nitrogen distribution in groundwater. The results show that NO3-and TN in groundwater within the underground reservoir had higher concentrations and smaller spatial differences than they did outside of the underground reservoir,and the main nitrogen source was fertilizer in groundwater within the underground reservoir. Denitrification occurred in groundwater within the underground reservoir. The nitrogen in groundwater outside of the underground reservoir was mainly from mariculture and fertilizers. All the results mentioned above indicate that the underground reservoir prevents nitrogen from flowing horizontally,resulting in the accumulation of nitrogen and the enhancement of denitrification of nitrogen in groundwater within the underground reservoir.

关 键 词：地下水库 氮氧同位素 环境影响 氮来源 IsoSource 氮贡献比例 

分 类 号：P597.2[天文地球—地球化学] X523[天文地球—地质学]