| 农田表层土壤中重金属潜在生态风险效应研究 |
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| 引用本文： | 王茜,张光辉,田言亮,严明疆,张希雨. 农田表层土壤中重金属潜在生态风险效应研究[J]. 水文地质工程地质, 2017, 0(4): 165-172 |
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| 作者姓名： | 王茜 张光辉 田言亮 严明疆 张希雨 |
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| 作者单位： | 中国地质科学院水文地质环境地质研究所，河北 石家庄050061 |
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| 基金项目： | 国家自然科学基金项目（41502253）；中国地质调查局地质调查项目（12120115049701，121201236000160009） |
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| 摘 要： | 皖江经济区南陵县是我国商品粮生产基地之一，该区农田表层土壤中重金属元素潜在生态风险效应研究对于提高粮食安全具有重要意义。文章以南陵县基本农田区作为主要研究区，按土地质量地球化学调查评价要求，布设和采集了0~20 cm深度的表层土壤样品500组，分别监测了土壤中Cd、Pb、Cr、Hg、As、Cu、Fe、Mn和Zn等重金属含量现状，并采用地质累积指数法和潜在生态风险指数法量化解析了这些重金属在土壤中的潜在生态风险效应。结果表明:（1）土壤中除了Cr元素，其余重金属元素都不同程度存在异常；（2）局部土壤中Cd、Hg和Fe等元素含量存在异常，平均含量分别是所在区域背景值的1.92，1.95，7.13倍，存在潜在生态风险的影响；（3）土壤中重金属元素的潜在生态风险值（平均RI值）为164.5，Cd和Hg元素为主要影响元素。
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| 关 键 词： | 农田区表层土壤 重金属 潜在生态风险 粮食安全 地质累积指数法 |
| 收稿时间： | 2016-10-25 |
| 修稿时间： | 2017-02-20 |
Research on the potential ecological risk of farmland top-soil of heavy metals |
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| WANG Qian,ZHANG Guanghui,TIAN Yanliang,YAN Mingjiang,ZHANG Xiyu. Research on the potential ecological risk of farmland top-soil of heavy metals[J]. Hydrogeology and Engineering Geology, 2017, 0(4): 165-172 |
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| Authors: | WANG Qian ZHANG Guanghui TIAN Yanliang YAN Mingjiang ZHANG Xiyu |
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| Affiliation: | Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang,Hebei050061, China |
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| Abstract: | Basic farmland plays an important role in grain quality and security. Research on the potential ecological risk of farmland top-soil of heavy metals is of great guiding significance for increasing grain yield and security. Based on the assessment standard of the soil quality geo-chemical survey, this article selects the basic farmland in Nanling county in Anhui as the main study area, and a total of 500 top-soil samples (depth of 0~20 cm) are collected. By using the methods of geo-accumulation index and potential ecological risk index, the potential effects of heavy metals in the top-soil of Nanling farmland are examined. The results show that (1) there is no pollution of the heavy metal element Cr in the top-soil, however, the rest of heavy metals occur harmful effects in varying degrees; (2) the contents of heavy metals Cd, Hg and Fe exist regional abnormal in top-soil and mean concentration of these heavy metals are more than the geo-chemical background value of Nanling county 1.92, 1.95 and 7.13 times, respectively, which carries potential risk for the grain quality and security; (3) the mean RI value is 164.5, indicating that the Nanling farmland sufferes from a moderate-level potential ecological risk and the principle heavy metals element are Cd and Hg. |
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