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首页> 外文期刊>Ground water >Spatial Variability of Nitrate and Ammonium in Pleistocene Aquifer of Central Yangtze River Basin
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Spatial Variability of Nitrate and Ammonium in Pleistocene Aquifer of Central Yangtze River Basin

机译：长江中游更新世含水层中硝酸盐和铵盐的空间变异

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摘要

It becomes increasingly important and challenging for nitrogen pollution prevention to identify key controls for spatial variability of nitrogen in groundwater that could be affected by multiple factors, including anthropogenic input, groundwater flow, and local geochemistry. This study characterized spatial variability of both nitrate and ammonium in the Pleistocene aquifer of central Yangtze River Basin and assessed the effect of various factors in controlling nitrate and ammonium levels based on multiple statistical approaches (correlation, geostatistics, multiple liner regression). The results indicate that nitrate is mostly influenced by Cl- that represents anthropogenic input, while Eh representing local redox state is a secondary variable influencing nitrate concentrations. The groundwater with elevated nitrate concentrations are estimated to occur mainly in areas with higher-permeability near-surface sediments which can facilitate more anthropogenic nitrate transport and less nitrate removal owing to more oxidized state. Ammonium is mostly correlated to Eh, followed by dissolved organic carbon (DOC), but only DOC improves significantly the accuracy of co-kriging prediction model. The groundwater with elevated ammonium concentrations are estimated to occur mainly in areas with more organic-rich sediments within or around the aquifer which can facilitate more ammonium release owing to natural organic matter consumption accompanying strong reducing conditions. The regional groundwater flow is not a factor significantly controlling nitrate or ammonium levels owing to flat topography and sluggish lateral flow.
机译：对于确定氮素空间变异性的关键控制因素（可能受到多种因素影响，包括人为输入，地下水流量和局部地球化学因素），对于预防氮污染而言，变得越来越重要和挑战。这项研究表征了长江中游盆地更新世含水层中硝酸盐和铵盐的空间变异性，并基于多种统计方法（相关性，地统计学，多重线性回归）评估了各种因素在控制硝酸盐和铵盐水平中的作用。结果表明，硝酸盐主要受代表人为输入的Cl-的影响，而代表局部氧化还原状态的Eh是影响硝酸盐浓度的次要变量。据估计，硝酸盐浓度升高的地下水主要发生在渗透率较高的近地表沉积物区域，由于氧化态的存在，这些区域可以促进更多的人为硝酸盐运输和较少的硝酸盐去除。铵主要与Eh相关，其次是溶解有机碳（DOC），但只有DOC可以显着提高协同克里格预测模型的准确性。据估计，铵盐浓度升高的地下水主要发生在含水层内或周围含水量较高的沉积物中，这些区域由于强烈的还原条件而消耗了天然有机物，可以促进更多的铵盐释放。由于平坦的地形和缓慢的侧向流量，区域地下水流量不是显着控制硝酸盐或铵盐含量的因素。

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  • 来源
    《Ground water》 |2020年第1期|110-118|共9页
  • 作者

    Du Yao; Deng Yamin; Ma Teng; Shen Shuai; Lu Zongjie; Gan Yiqun;

  • 作者单位

    China Univ Geosci Sch Environm Studies 388 Lumo Rd Wuhan 430074 Peoples R China|China Univ Geosci Lab Basin Hydrol & Wetland Ecorestorat 388 Lumo Rd Wuhan 430074 Peoples R China;

    China Univ Geosci Sch Environm Studies 388 Lumo Rd Wuhan 430074 Peoples R China;

    China Univ Geosci Geol Survey 388 Lumo Rd Wuhan 430074 Peoples R China;

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