| 承德伊逊河钒钛磁铁矿小流域土壤重金属地球化学基线及生态风险累积效应 |
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| 引用本文： | 孙厚云,卫晓锋,贾凤超,何泽新,孙晓明.承德伊逊河钒钛磁铁矿小流域土壤重金属地球化学基线及生态风险累积效应[J].地质学报,2021,95(2):588-604. |
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| 作者姓名： | 孙厚云 卫晓锋 贾凤超 何泽新 孙晓明 |
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| 作者单位： | 中国地质大学(北京)水资源与环境学院,北京,100083;北京矿产地质研究院,北京,100012;北京矿产地质研究院,北京,100012;中国地质大学(北京)水资源与环境学院,北京,100083;中国地质调查局天津地质调查中心,天津,300017 |
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| 基金项目： | 本文为中国地质调查局项目(编号DD20160229- 01; DD20190822)资助成果。 |
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| 摘 要： | 以承德市伊逊河红旗钒钛磁铁矿小流域为例,通过参比元素标准化法、垂向剖面似背景值法确定小流域矿集区土壤12种重金属的地球化学基线,并与不同空间尺度流域的重金属地球化学基线进行对比;采用确定的基线值结合地累积指数法、地统计学、生态风险指数法和GIS叠加法对流域土壤重金属潜在生态风险和累积程度进行了评价。结果表明:钒钛磁铁矿矿致异常元素地球化学基线值具有明显的流域尺度效应,其值随着流域空间尺度的缩小而升高;在已开采矿集区小流域土壤重金属污染生态风险评价时,可选取其上一级流域地球化学基线值作为标准。伊逊河红旗矿集区小流域V、Ti、Co、Ni和Cr元素基线值高于滦河流域,As、Pb、Zn和Cd元素基线值与滦河流域相近,Mn和Hg元素基线值略低于滦河流域,Cu元素基线值略高于滦河流域。表层土壤重金属污染累积程度由强至弱为:Cu>Cr>Ti>Cd>Co>V>Ni>Zn>As>Hg>Mn>Pb;表层土壤重金属综合潜在生态风险指数RI范围为65.89~237.70,总体生态风险水平属低风险水平。深层土壤重金属总体污染累积程度和综合潜在生态风险总体弱于浅层土壤。流域土壤重金属综合潜在生态风险累积程度空间分布与流域地貌特征具有明显的耦合关系,重金属空间迁移主要受水力作用驱动控制,土壤重金属污染来源主要为矿业活动,同时受岩石风化和土壤侵蚀等自然因素影响。
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| 关 键 词： | 重金属 地球化学基线 流域 生态风险评价 钒钛磁铁矿 承德 |
| 收稿时间： | 2020/4/17 0:00:00 |
| 修稿时间： | 2020/6/9 0:00:00 |
Geochemical baseline and ecological risk accumulation effect of soil heavy metals in the small- scale drainage catchment of V- Ti- magnetite in the Yixun River basin, Chengde |
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| SUN Houyun,WEI Xiaofeng,JIA Fengchao,HE Zexin,SUN Xiaoming.Geochemical baseline and ecological risk accumulation effect of soil heavy metals in the small- scale drainage catchment of V- Ti- magnetite in the Yixun River basin, Chengde[J].Acta Geologica Sinica,2021,95(2):588-604. |
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| Authors: | SUN Houyun WEI Xiaofeng JIA Fengchao HE Zexin SUN Xiaoming |
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| Institution: | (School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing,100083;Beijing Institute of Geology for Mineral Resources,Beijing,100012;Tianjin Center,China Geological Survey,Tianjin,300170) |
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| Abstract: | The geochemical baseline values of 12 heavy metals were determined by using the reference element method and the background-similar method in a small-scale drainage catchment of vanadium-titanium magnetite mining area located in Hongqi Town, Yixun River, Chengde City. The standard values were determined by comparison with heavy metal geochemical baselines in different spatial scale watersheds to evaluate the potential ecological risk and accumulation of heavy metals in soil based on geostatistical analysis, geo-accumulation index, ecological risk index and GIS overlay method. The results indicated that an obvious small-scale drainage catchmentaccumulation effect appears in vanadium-titanium magnetite mine-induced anomalous elements i.e. the geochemical baseline values increase as the spatial scale of the basin decreases. The geochemical baseline value of the upper drainage catchment can be used as the evaluation criteria when assessing the ecological risk of soil heavy metal pollution in a small-scale drainage catchment in an already-developed mining area. The baseline values of V, Ti, Co, Ni, and Cr of surface soil in the Hongqi mine area are higher, Mn and Hg are slightly lower, Cu is slightly higher than that in the surface soil of the Luanhe River basin,while the values of As, Pb, Zn and Cd of surface soil are similar to that in the Luanhe River basin. The average accumulation index of the surface soils followed the order of Cu>Cr>Ti>Cd>Co>V>Ni>Zn>As>Hg>Mn>Pb. The potential ecological risk of heavy metals in surface soil was relatively low with the RI range between 65.89 to 237.70. The accumulation index and comprehensive potential ecological risk of heavy metals in deep soil are generally weaker than those in shallow soil. The spatial distribution of the cumulative potential ecological risk of soil heavy metals has an obvious coupling relationship with the geomorphological characteristics of the drainage catchment. The spatial migration of heavy metals is mainly driven and controlled by hydraulic action, and the heavy metal pollution in soil is mainly caused by mining activities and affected by natural factors such as rock weathering and soil erosion. |
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| Keywords: | heavy metal pollution geochemical baseline watershed vanadium titanomagnetite ecological risk Chengde |
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