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首页> 外文期刊>The Science of the Total Environment >Changes of solute transport characteristics in soil profile after mining at an opencast coal mine site on the Loess Plateau, China
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Changes of solute transport characteristics in soil profile after mining at an opencast coal mine site on the Loess Plateau, China

机译：中国黄土高原Opencast煤矿现场矿井后土壤平均溶质转运特性的变化

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摘要

Dramatic changes in soil during opencast coalmine activities inevitably change soil water and solute movement. The objectives of this study were to assess the effects of mining on solute transport in different soil profiles and to find the relationships between solute transport parameters and soil physicochemical characteristics. After taking undisturbed soil columns from the different soil profiles of natural land (NLs) and reclaimed mine land (RLs), ammonium nitrate displacement studies were conducted, and the breakthrough curves (BTCs) of NO3- and NH4+ were obtained. Due to mining and reconstruction, soil texture became coarser, bulk density increased 2.77-15.15%, cation exchange capacity (CEC), soil organic matter (SOM), and total nitrogen (TN) content decreased 19.54-37.25%, 53.66-72.05%, and 42.58-58.55%, respectively. Additionally, the distributions of the physicochemical properties changed. The BTCs of NO3- for all soil columns can be well explained by both the convection-dispersion equation (CDE) and the two-region model (T-R). The transport parameters average pore water velocity (nu), dispersion coefficient (D), and dispersivity (lambda) were lower in RLs, which indicates that solutes became difficult to penetrate after mining. A significantly correlated relationship of bulk density and soil texture with the nu, D, and lambda parameters only occurred in the RLs samples. This result indicates that transport processes in NLs columns became more complicated and that soil texture and bulk density played an important role in the transport process of RLs columns. The two-sitemodel couldwell describe NH4+ transport for both NLs and RLs and provided a slightly better fit in RLs. This finding also gave evidence that RLs became homogeneous after mining and reconstruction. The parameter retardation factor (R) was significantly correlated to CEC, bulk density and soil texture in RLs. These results suggest that soil becomes homogeneous after mining and reconstruction and that high bulk density and fine soil texture could decrease the risk of leaching of solutes. (c) 2019 Published by Elsevier B.V.
机译：Opencast煤矿活动期间土壤中的巨大变化不可避免地改变土壤水分和溶质运动。本研究的目的是评估采矿对不同土壤曲线溶质转运的影响，并找到溶质转运参数与土壤理化特征之间的关系。从自然土地（NLS）的不同土壤曲线和再生矿地（RLS）采取不受干扰的土壤柱后，进行硝酸铵位移研究，获得NO 3和NH 4 +的突破曲线（BTC）。由于采矿和重建，土壤质地变得粗糙，散装密度增加2.77-15.15％，阳离子交换能力（CEC），土壤有机物（SOM），和总氮（TN）含量下降19.54-37.25％，53.66-72.05％分别为42.58-58.55％。另外，物理化学性质的分布改变了。通过对流分散方程（CDE）和两区模型（T-R），可以很好地解释NO 3-对于所有土柱的BTC。 RLS中运输参数平均孔隙水速度（Nu），分散系数（D）和分散性（Lambda）较低，表明在采矿后难以渗透难以渗透。在RLS样品中仅发生散装密度和土壤纹理与粗糙度和λ参数的显着相关关系。该结果表明，NLS列中的运输过程变得更加复杂，土壤纹理和散装密度在RLS柱的运输过程中起着重要作用。两个站点模型可能会描述NH4 +对于NLS和RL的运输，并在RLS中提供稍微更好的适合。这一发现还提供了证据，即矿业和重建后RLS变得同质。参数延迟因子（R）与RLS中的CEC，散装密度和土壤纹理显着相关。这些结果表明，在采矿和重建后，土壤变得均匀，并且高散装密度和细土质地可能会降低溶质浸出的风险。 （c）2019年由elestvier b.v发布。

著录项

  • 来源
    《The Science of the Total Environment》 |2019年第may15期|142-152|共11页
  • 作者

    Zhen Qing; Zheng Jiyong; Zhang Xingchang; Shao Mingan;

  • 作者单位

    Chinese Acad Sci Key Lab Ecosyst Network Observat & Modeling Inst Geog Sci & Nat Resources Res Beijing 100101 Peoples R China|Northwest A&F Univ State Key Lab Soil Eros & Dryland Farming Loess P Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China|Chinese Acad Sci Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China|Minist Water Resources Yangling 712100 Shaanxi Peoples R China;

    Northwest A&F Univ State Key Lab Soil Eros & Dryland Farming Loess P Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China|Chinese Acad Sci Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China|Minist Water Resources Yangling 712100 Shaanxi Peoples R China;

    Northwest A&F Univ State Key Lab Soil Eros & Dryland Farming Loess P Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China|Chinese Acad Sci Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China|Minist Water Resources Yangling 712100 Shaanxi Peoples R China;

    Chinese Acad Sci Key Lab Ecosyst Network Observat & Modeling Inst Geog Sci & Nat Resources Res Beijing 100101 Peoples R China|Northwest A&F Univ State Key Lab Soil Eros & Dryland Farming Loess P Inst Soil & Water Conservat Yangling 712100 Shaanxi Peoples R China|Univ Chinese Acad Sci Coll Resources & Environm Beijing 100190 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nitrate; Ammonium; Solute transport; Breakthrough curves; Soil properties; Mining area;

    机译：硝酸盐;铵;溶质运输;突破性曲线;土壤性质;矿区;

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