Geochemical characteristics and ecological risk assessment of heavy metals in surface sediments of Baiyangdian Lake, Xiong'an New Area
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摘要:
研究目的 白洋淀为雄安新区核心生态功能区，为支撑白洋淀湿地生态修复与保护，系统开展了全淀区表层沉积物环境质量调查。
研究方法 在白洋淀湿地采集表层沉积物样品484组，查明了白洋淀表层沉积物重金属地球化学特征，并采用地累积指数法、潜在生态风险指数法等多种方法开展了重金属生态风险评价。
研究结果 白洋淀表层沉积物重金属含量普遍偏高于河北省表层土壤重金属含量背景值，府河入淀口及白沟引河入淀口为重金属元素主要富集区，入淀河流输入为白洋淀重金属主要来源；环境地球化学综合评价结果为清洁无污染等级分布面积144.54 km2，占表层沉积物分布总面积的96.68%；各重金属污染程度由重到轻排序为Cd＞Cu＞Hg＞Pb＞Zn＞Ni＞Cr＞As，Cd元素污染程度等级以中度和偏中度为主，Cu元素以轻度和清洁为主，其他元素以清洁无污染为主；重金属潜在生态风险以轻度和中度为主，河流入淀口所在淀区重金属潜在生态风险高于其他淀区，潜在生态风险由高到低排序为南刘庄＞烧车淀＞小白洋淀＞王家寨＞藻苲淀＞捞王淀＞池鱼淀＞泛鱼淀。
结论 白洋淀表层沉积物环境质量总体较好，南刘庄等局部淀区存在重金属污染潜在生态风险，以Cd元素污染最为突出。
Abstract:This peper is the result of environmental geological survry engineering.
Objective Baiyangdian Lake(BYD Lake)is the main ecological function area of Xiong'an New Area. In order to provide support for ecological restoration and protection of BYD Lake, we conducted a comprehensive survey on the environmental quality of the surface sediments in BYD Lake.
Methods We collected 484 sets of surface sediment samples from Baiyangdian wetland, identified the geochemical characteristics of heavy metals in surface sediments of Baiyangdian lake, and used multiple methods such as geo- accumulation index method and potential ecological risk index method to evaluate the ecological risk of heavy metals.
Results The results indicate that the average content of most heavy metal elements in the surface sediments of BYD Lake is significantly higher than the soil background value in Hebei Province. The entrance of Fuhe river and Baigou river are the main rich areas of heavy metal elements, rivers are the main sources of heavy metals in the surface sediments of BYD Lake. The distribution area of clean and pollution-free grade is 144.54 km2, accounting for 96.68% of the total surface sediment distribution area. The pollution degree of each heavy metal can be ranked as Cd > Cu > Hg > Pb > Zn > Ni > Cr > As. The pollution degree of Cd is mainly moderate, the pollution degree of Cu is mainly light and clean, and the pollution degrees of other elements are mainly clean and pollution-free. The potential ecological risk of heavy metals in the surface sediments of BYD Lake is mainly mild and moderate, and the potential ecological risk level of heavy metals near the river entrance is higher than that of other areas. The potential ecological risk levels can be ranked as Nanliuzhuang > Shaochedian > Xiaobaiyangdian > Wangjiazhai > Zaozhadian > Laowangdian > Chiyudian > Fanyudian.
Conclusions The environmental quality of the surface sediments in BYD Lake is generally good, with heavy metals exceeding the standard in some areas. The environmental quality of surface sediments in Baiyangdian is generally good. There are potential ecological risks of heavy metal pollution in Nanliuzhuang and other areas, and Cd is the main pollution element.
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表 1 农用地土壤污染风险筛选值与管制值
Table 1. Risk screening values and risk intervention values for soil contamination of agricultural land
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表 5 白洋淀表层沉积物重金属含量特征统计
Table 5. Characteristics of heavy metals in surface sediments of BYD Lake
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表 6 中国中东部主要湖泊表层沉积物重金属含量统计
Table 6. Statistics of heavy metals in surface sediments of main lakes in eastern China
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表 7 白洋淀表层沉积物各重金属元素污染指数及各等级样本数统计
Table 7. Statistics of pollution index and sample numbers of each grade of heavy metal elements in surface sediments of BYD Lake
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表 8 白洋淀表层沉积物地累积指数分级统计
Table 8. Classification statistics of geoaccumulation index of surface sediment in BYD Lake
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表 9 白洋淀表层沉积物重金属元素潜在生态风险指数分级统计
Table 9. Statistics of potential ecological risk index of heavy metal elements in surface sediments of BYD Lake
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表 10 白洋淀表层沉积物重金属含量相关性
Table 10. Correlation of heavy metal content in surface sediments of BYD Lake
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