| 三峡库区典型农田小流域土壤汞的空间分布特征 |
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| 引用本文： | 王娅,赵铮,木志坚,王定勇,余亚伟.三峡库区典型农田小流域土壤汞的空间分布特征[J].环境科学,2015,36(1):130-135. |
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| 作者姓名： | 王娅 赵铮 木志坚 王定勇 余亚伟 |
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| 作者单位： | 1. 西南大学资源环境学院,重庆,400715
2. 西南大学资源环境学院，重庆 400715; 重庆市三峡库区农业面源污染控制工程技术研究中心，重庆 400716; 重庆市农业资源与环境研究重点实验室，重庆 400716 |
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| 基金项目： | 国家重点基础研究发展规划(973)项目(2013CB430004); 国家自然科学基金项目(41373113, 41173116) |
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| 摘 要： | 为了解三峡库区农田流域汞污染现状及其生态风险,以三峡库区腹心地带的涪陵王家沟典型农田小流域为调查对象,基于Arc GIS地统计模块研究流域内不同土地利用类型(旱地、田地、林地和居民点)土壤汞(Hg)含量及其分布特征,并对其汞污染程度和生态风险进行评价.结果表明,流域内土壤Hg含量范围为9.47~94.57μg·kg-1,均值为(34.23±16.23)μg·kg-1,不同土地类型表层土壤Hg含量高低顺序为林地、田地、居民点、旱地;表层土壤出现明显汞累积现象,土壤Hg含量变化与土壤深度呈极显著负相关关系.地统计分析结果表明,流域土壤中的汞呈现出较弱的空间相关性,说明流域内土壤汞的空间分布主要受大气干湿沉降、植被覆盖和地形等自然因素影响,人为等外源干扰影响弱.流域土壤总体上虽未表现出明显的汞污染现象(污染指数为-0.08),但具有中度的汞潜在生态风险(生态风险指数为57),其中以林地较为严重.流域土壤汞承载量约为25.39 kg,旱地约占69%.
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| 关 键 词： | 汞 土壤 三峡库区 农田流域 污染评价 |
| 收稿时间： | 7/1/2014 12:00:00 AM |
| 修稿时间： | 2014/8/15 0:00:00 |
Spatial Distribution of Mercury in Soils of a Typical Small Agricultural Watershed in the Three Gorges Reservoir Region |
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| WANG Y,ZHAO Zheng,MU Zhi-jian,WANG Ding-yong and YU Ya-wei.Spatial Distribution of Mercury in Soils of a Typical Small Agricultural Watershed in the Three Gorges Reservoir Region[J].Chinese Journal of Environmental Science,2015,36(1):130-135. |
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| Authors: | WANG Y ZHAO Zheng MU Zhi-jian WANG Ding-yong and YU Ya-wei |
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| Institution: | College of Resource and Environment, Southwest University, Chongqing 400715, China;College of Resource and Environment, Southwest University, Chongqing 400715, China;College of Resource and Environment, Southwest University, Chongqing 400715, China;Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400716, China;Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China;College of Resource and Environment, Southwest University, Chongqing 400715, China;Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400716, China;Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China;College of Resource and Environment, Southwest University, Chongqing 400715, China |
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| Abstract: | |
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| Keywords: | mercury soil Three Gorges Reservoir region agricultural watershed pollution assessment |
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