Ecological risk assessment of eutrophication in Songhua Lake, China |
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Authors: | Xia Wang Shuying Bai Xianguo Lu Qiufen Li Xuelin Zhang Li Yu |
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Institution: | (1) Environmental Monitoring Centre of Jilin Province, Changchun, 130011, China;(2) Department of Spatial Information Science, Nanjing University of Information Science and Technology, Nanjing, 210044, China;(3) Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun, 130012, China;(4) Yellow Sea Fisheries Research Institute, CAFS, Qingdao, 266071, China |
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Abstract: | The Songhua Lake in the Northeast China is chosen as a study case in this paper. Monitoring of samples and analysis 18 indexes
related to the eutrophication in the Songhua Lake had been conducted in 2002–2004. Ecological risk assessment methods are
employed here. The study results showed that total phosphorus and total nitrogen were main risk factors to impact on the eutrophication
of the Songhua Lake, and influence of the phosphorus on the lake eutrophication was larger than that of nitrogen. Algal growth
potential test was also conducted to validate the results. High phosphorus and high nitrogen concentrations were mostly distributed
in Huifahekou and Jiaohe sites of the Songhua Lake. Threshold values of total phosphorus, total nitrogen and Chl-a concentrations
from dose-effective examination were 0.065 mg/L, 0.843 mg/L, and 11.90 μg/L, respectively. The probability of the eutrophication
appeared in the Songhua Lake was 0.69, of them, risk-free type area was 19.21% of total lake area, slight risk type area was
30.10%, middle risk type area was 16.50%, heavy risk type area was 25.8%, hyper risk type area was 8.39%. In order to control
the eutrophication in the Songhua Lake, maximum permission discharges of total phosphorus and total nitrogen to the lake would
be 2,123.78, 7,018.82 t/a, respectively. |
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Keywords: | Eutrophication Total phosphorus Total nitrogen Ecological risk assessment Songhua Lake |
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