| 摘要: |
| 潼湖湿地是东江二、三级水系，是重要的农业生产基地，由于工业开发等人类活动，湿地土壤受到不同程度的影响。为了探究潼湖湿地表层（0~15 cm）土壤重金属污染现状，在潼湖湿地范围内采集 18 个土壤样品，测定样品中汞（Hg）、镉（Cd）、砷（As）、镍（Ni）、铅（Pb）、铜（Cu）、钴（Co）、铬（Cr）、锰（Mn）、锌（Zn）等 10 种重金属的含量特征，采用潜在生态风险指数法进行污染评价。结果表明：（1）潼湖湿地表层土壤内 10 种重金属富集系数表现为 Cd ＞ Zn ＞ Cu ＞ Hg ＞ Ni ＞ Cr ＞ As ＞Pb ＞ Co ＞ Mn，Cd 含量平均值分别是国家土壤环境质量标准和广东省土壤环境背景值的 5.05 倍、29.71倍。（2）潼湖湿地总体上属于很强—极强污染，其中潜在生态风险最大的是 Cd 元素，属于极强污染风险；其次是 Hg 元素，属于强污染风险，其余 8 种重金属元素属于轻微污染风险。（3）总体来看，受周围
农场、养殖场、工厂等污染源影响，潼湖湿地综合潜在生态风险指数达到很高生态风险水平。 |
| 关键词: 湿地 重金属 生态风险评价 潼湖 |
| DOI： |
| 分类号: |
| 基金项目:惠州市科技计划项目 (2020SC0205014) |
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| The Present Pollution Situation and the Ecological Risk Assessment of Heavy Metal Contamination in Soil of Tonghu Wetland |
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LIU De-hao, LIAO Wen-li, CHEN Zhi-tao, Yang Yan-ping, WU Bao-hong, SHU Xia-zhu, DENG Fang-dong
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Huizhou Institute of forestry,Huizhou 51600,Guangdong China
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| Abstract: |
| Tonghu wetland is not only the second and third grade water system of Dongjiang River but also an important agricultural production base. However, the wetland soil was affected to varying degrees because of human activities such as industrial development. In order to assess heavy metal pollution of surface soil (0-15cm), 18 soil samples were collected. The content of 10 heavy metals including mercury (Hg), cadmium (Cd), arsenic (As), nickel (Ni), lead (Pb), copper (Cu), cobalt (Co), chromium (Cr), manganese (Mn) and zinc (Zn) were determined to evaluate the pollutionusing potential ecological risk index method. The results showed that:(1) The coefficient of 10 heavy metal accumulation in the surface soil was in the sequence of Cd> Zn > Cu >
Hg > Ni > Cr>As >Pb>Co >Mn, then the average content of Cd was respectively 5.05 times of the national soil environmental quality standard and 29.71 times of the soil background value in Guangdong Province.(2) Tonghu wetland generally belonged to very high pollution, with the highest potential ecological risk of Cd which belonged to very strong pollution, followed by Hg which belonged to strong pollution, and the rest eight heavy metal elements belonged to light pollution.(3) Generally, the comprehensive potential ecological risk index of Tonghu wetland had reached a very strong ecological risk level due to the influence of surrounding pollution sources such asfarms, factories, etc. |
| Key words: wetland heavy metals ecological risk assessment Tonghu |
