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Historical variation and recent ecological risk of heavy metals in wetland sediments along Wusuli River,Northeast China |
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| Authors: | Chuanyu Gao Qianxin Lin Kunshan Bao Haiyang Zhao Zhenqing Zhang Wei Xing Xianguo Lu Guoping Wang |
| Institution: | 1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China 2. University of Chinese Academy of Sciences, Beijing, 100049, China 3. Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, Baton Rouge, LA, 70803, USA 4. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China |
| Abstract: | The 150-year historical changes in concentrations of pollution elements (Pb, Cu and Zn) in sediment profiles from two riparian freshwater wetlands along the Wusuli River (boundary river between China and Russia) were studied, and the ecological risk of heavy metals and their effects on four riparian wetlands during the urban development from Khanka Lake to Black Bear Island along the Wusuli River were assessed. Results showed that there are sharp increases of the enrichment factor and the ratio of anthropogenic/total of heavy metals in the sediment profiles during the 2000s, which showed that intensive human activities during city development had greatly affected heavy metals distribution since the 1960s. According to the principal component analysis, sediment textures, redox regimes, and organic matter contents accounted for 45.7, 23.6 and 16.5 % of the total variance of element concentrations, respectively. This study also showed that ecological risk of heavy metals was increased along the Wusuli River and closely related to the water quality of the rivers as their hydrological regimes likely affect wetlands. |
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