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文章摘要
成都市平原区浅层地下水中“三氮”来源解析
Source Apportionment of “Three Nitrogen Species” in Shallow Groundwater of the Chengdu Plain Area
  
DOI:
中文关键词: 氮  来源解析  主成分分析  绝对主成分得分〖CD*2〗多元线性回归模型  地下水  成都市
英文关键词: Nitrogen   Source apportionment  Principal component analysis  APCS MLR model  Groundwater  Chengdu
基金项目:国家自然科学基金资助项目(U2444219);自然资源部部省合作基金资助项目(2024ZRBSHZ021);中国地质调查局地质调查基金资助项目(DD20211256)
作者单位
刘灏 四川省国土空间生态修复与地质灾害防治研究院 
孙鸿志 四川省国土空间生态修复与地质灾害防治研究院 
刘艳明 中国地质环境监测院 
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中文摘要:
      以成都市平原区地下水为例,结合水化学离子分析、主成分分析(PCA)和绝对主成分得分〖CD*2〗多元线性回归(APCS-MLR)受体模型等方法解析该地区地下水中“三氮”的来源和演化规律。结果表明:研究区浅层地下水水质状况较好,地下水类型为HCO3-Ca型,平均矿化度为51581 mg/L,pH值为640~768,整体呈弱碱性;NO-3 N、NH+4 N检出率>90%,NO-2 N检出率较低,部分点位NO-3 N、NH+4 N含量超标,存在局部富集现象;研究区地下水质量的影响因素主要为蒸发盐溶解(4603%)、还原作用(1565%)、生活污染(1398%)、硅酸岩溶解(1062%),累积方差贡献率为8628%;自然源是影响研究区地下水质量的主要因素(贡献率为7680%),人类活动贡献率为917%;从单项影响因子来看,生活污染对研究区NO-3 N的贡献率(3885%)最高,还原作用是NH+4 N的主要影响因子(贡献率为4972%)。
英文摘要:
      Taking the shallow groundwater of the Chengdu Plain area as a case study, hydrochemical ion analysis, principal component analysis(PCA), and absolute principal component score multiple linear regression(APCS MLR) receptor model were used to decipher the sources and evolution patterns of “three nitrogen species” in the region. The results indicated that the shallow groundwater in the study area was of generally good quality. The hydrochemical type was HCO3 Ca, with an average total dissolved solids of 51581 mg/L and pH values ranging from 640 to 768, indicating weakly alkaline conditions. Detection frequencies of NO-3 N and NH+4 N exceeded 90%, whereas NO-2 N was detected much less 〖JP3〗frequently. At several sampling sites, NO-3 N〖JP〗 and NH+4 N concentrations exceeded the permissible limits, suggesting localized enrichment. The primary controls on groundwater quality in the study area were evaporite dissolution(4603%), reduction processes(1565%), domestic pollution(1398%), and silicate rock dissolution(1062%), with a cumulative variance contribution of 8628%. Natural sources were the main 〖GK!87mm〗factors affecting groundwater quality, contributing 7680%, whereas anthropogenic activities accounted for 917%. Among the individual influencing factors, domestic pollution exhibited the highest contribution to NO-3 N(3885%), while reduction processes were the dominant factor controlling NH+4 N, with a contribution rate of 4972%.
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