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| Distribution characteristics of pollution from nitrogen, phosphorus, and heavy metals in sediments of Shankou Lake in Northeast China |
| Received:August 19, 2017 |
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| KeyWord:sediment;nitrogen;phosphorus;heavy metal;ecological risk |
| Author Name | Affiliation | E-mail | | LIU Li-na | School of Civil and Architecture Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China | | | MA Chun-zi | Chinese Research Academy of Environment Sciences, Beijing 100012, China | | | ZHANG Jing-tian | Chinese Research Academy of Environment Sciences, Beijing 100012, China | | | HE Zhuo-shi | Chinese Research Academy of Environment Sciences, Beijing 100012, China | | | HUO Shou-liang | Chinese Research Academy of Environment Sciences, Beijing 100012, China | | | XI Bei-dou | Chinese Research Academy of Environment Sciences, Beijing 100012, China | xibeidou@263.net |
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| Abstract: |
| The organic index, organic nitrogen content, potential ecological risk index, and geo-accumulation index were used to estimate nitrogen, phosphorus, and heavy metal pollution in sediments from Shankou Lake, a typical mountain lake in the northeast region of China. The ecological safety of sediments was also evaluated. The results indicated that the average nutrients in sediments in the wet and dry seasons were 3968 mg·kg-1 and 5780 mg·kg-1(total nitrogen, TN), and 1557 mg·kg-1 and 1787 mg·kg-1(total phosphorous, TP), respectively. TN and TP contents in sediments during the wet season were significantly lower than those during the dry season. A high C/N ratio in sediments in the wet season(average:20.76) indicated exogenous particulate organic matter was the main source of pollutants. The low C/N ratio in sediments(average:8.91) in the dry season indicated that algae and aquatic organisms in the water column were the main sources of pollutants. Nitrogen pollution in sediments from Shankou Lake were at level Ⅳ in both the wet and dry seasons, indicating that sediments were always polluted by organic matter to some degree. High TN and TP contents in sediments were found in the upstream lake fork during the wet season, and in the main channel and downstream during the dry season. Cd pollution levels in the sediments were relatively high, while Cu, Ni, As, and Zn were either absent or observed at low levels. Heavy metals in sediments in the dry season posed ahigh ecological risk, while those in the wet season presented an even higher ecological risk. |
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