中国生态农业学报2017，Vol.25Issue(10)：1545-1553,9.DOI:10.13930/j.cnki.cjea.170153
辽河干流坝间耕地土壤重金属污染特征研究
Characteristics of soil heavy metals pollution in cultivated land in zones between ipsilateral dams of Liaohe River
摘要
Abstract
The heavy metals [zinc (Zn), lead (Pb), copper (Cu) and cadmium (Cd)] contents in the 0-5 cm, 5-15 cm and 15-30 cm soil depths of zones between ipsilateral dams in ten sections along Liaohe River were detected and the pollution situation of single heavy metal was evaluated using the geological accumulation index method. The potential degree of ecological damage by heavy metals was comprehensively evaluated using potential ecological risk index. The aims of the study were to evaluate the pollution degree of heavy metals, and explore the agricultural safety in zones between ipsilateral dams of Liaohe River. The results showed that the average contents of Cu, Pb and Zn were 32.42 mg·kg-1, 38.23 mg·kg-1 and 47.35 mg·kg-1, respectively. The contents of heavy metals in different sections and at various soil depths were lower than the GradeⅡstandard of the National Soil Environmental Quality Standard. The average content of Cd was 1.625 mg·kg-1, which was 1.70 times higher than the GradeⅡ standard of the National Soil Environmental Quality Standard. While from Zhuer Mountain to Yu-baoTai Grand Bridge, the trend of soil Cd content increased, it decreased from Yubaotai Grand Bridge to the estuary. Then using the Liaohe Bridge as the divide, the average content of Cd in the upper stream region was 6.47 times that in the lower reaches. The geological accumulation indexes of Pb, Cu and Zn in each sample section were all lower than 1.0, but the geo-logical accumulation index of Cd obviously reflected a pollution trend in the study area. Strong pollution in excess of Grade V standard mainly occurred in the upper reaches of Liaohe River. From Tongjiang port to Yubaotai Bridge, potential ecological risk index of various heavy metals was very strong. Hudedian, Daniudukou, on to Liaohe Bridge was an area with a strong ecological hazard. Then the dawn bridge area had a medium ecological hazard. Finally, Lengdong Bridge, Zhaoquan River and Liaohe River estuary constituted the area with slight ecological hazard. The contribution of Cd in various sections to potential ecological risk of multi-metal was 78.77%-98.23%, which was positively correlated with the potential ecological risk index. The performance trend of various heavy metals in terms of potential ecological risk index was similar to the distribution trend in geological accumulation index of Cd, with the maximum value in Tongjiang estuary.关键词
重金属污染/辽河干流坝间/耕地土壤/地质累积指数/潜在生态风险指数Key words
Heavy metal pollution/Zone between ipsilateral dam of Liaohe River/Cultivated soil/Geological accumulation index/Potential ecological risk index分类
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刘强,张婉秋,周贵宇,梁雷,白晓亮,陈杨..辽河干流坝间耕地土壤重金属污染特征研究[J].中国生态农业学报,2017,25(10):1545-1553,9.基金项目
格平绿色助学行动辽宁环境科研'123工程'(CEPF2010-123-2-4)、沈阳市科学计划项目(121807, F12-178-9-00)和辽宁省自然基金项目 (201104526)资助 This study was supported by the '123 Project' of China Environment Protection Foundation (CEPF2010-123-2-4), Shenyang Science Program (121807, F12-178-9-00) and the Natural Science Foundation of Liaoning Province (201104526). （CEPF2010-123-2-4）
