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鄂尔多斯盆地多级次地下水流系统中硝酸盐分布特征及其成因
引用本文:张晓旭,周爱国,刘运德,张俊. 鄂尔多斯盆地多级次地下水流系统中硝酸盐分布特征及其成因[J]. 地质科技通报, 2022, 41(1): 231-239. DOI: 10.19509/j.cnki.dzkq.2022.0022
作者姓名:张晓旭  周爱国  刘运德  张俊
作者单位:中国地质大学(武汉)环境学院;中国地质大学(武汉)生物地质与环境地质国家重点实验室;中国地质调查局西安地质调查中心
基金项目:国家自然科学基金项目41772263中国地质调查局干旱-半干旱区地下水与生态重点实验室基金项目KLGEAS201602
摘    要:水资源短缺的鄂尔多斯盆地内地下水遭受硝酸盐(NO-3)污染等问题日益突出,识别盆地不同地下水流系统的NO-3分布规律及其成因,对地下水资源的合理利用与保护具有重要意义。选取鄂尔多斯盆地北部湖泊集中区白垩系地下水系统为研究对象,基于水化学和聚类-主成分分析划分地下水流系统级次,在此基础上对比分析不同级次地下水流系统中NO-3分布特征,综合水化学和环境同位素分析识别多级次地下水流系统中NO-3来源及其潜在过程。研究表明:研究区ρ(NO-3)超出地下水质量标准(GB/T 14848-2017)Ⅲ类水标准的地下水样品集中在局部-中间地下水流系统,其超标率达到28%;区域地下水流系统中ρ(NO-3)均值约为1 mg/L。研究区不同级次地下水流系统中ρ(NO-3)分布特征主要与人类活动影响程度有...

关 键 词:地下水流系统  硝酸盐  水化学  环境同位素  鄂尔多斯盆地
收稿时间:2021-10-31

Distribution characteristics and genesis of nitrate in nested groundwater flow system in northern Ordos Basin
Zhang Xiaoxu,Zhou Aiguo,Liu Yunde,Zhang Jun. Distribution characteristics and genesis of nitrate in nested groundwater flow system in northern Ordos Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(1): 231-239. DOI: 10.19509/j.cnki.dzkq.2022.0022
Authors:Zhang Xiaoxu  Zhou Aiguo  Liu Yunde  Zhang Jun
Affiliation:(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430078,China;Xi'an Center of Geological Survey,China Geological Survey,Xi'an 710001,China)
Abstract:Under the situation of water shortage and increasingly serious groundwater nitrate pollution in Ordos Basin, it is helpful for rational utilization and protection of groundwater resources to identify the distribution and causes of nitrate in different groundwater flow systems in Ordos Basin, so this research was carried out in the typical groundwater-fed lakes area within the basin.Hydrochemistry and multivariate statistical analysis (i.e., hierarchical cluster analysis and principal component analysis) were combined to identify the nested groundwater flow systems.Based on this, the distribution characteristics of nitrate in different groundwater flow systems were compared and analyzed.And both hydrochemistry and environmental isotopes were considered to further identify the sources and potential evolution processes of nitrate in nested groundwater flow systems.The results show that the groundwater samples with nitrate content exceeding the groundwater quality standard (GB/T 14848-2017) were taken from the local and intermediate groundwater flow system, with an over-standard rate reached 28%, and the mean nitrate content in the regional groundwater flow system is about 1 mg/L.The distribution of nitrate in different groundwater flow systems was dominated by the extent of human activities, while the influence of evaporation enrichment and denitrification attenuation processes can be ignored.And within the nested groundwater flow systems, the local and intermediate ones were significantly affected by pollution from human activities, with inorganic ammonium fertilizer and manure and sewage the main pollution sources of nitrate, but the regional one has not been polluted, with mineralization of natural organic nitrogen as its nitrate source. 
Keywords:groundwater flow system  nitrate  hydrochemistry  environmental isotopes  Ordos Basin
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