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- Title
东北典型湖泊沉积物氮磷和重金属分布特征及其污染评价研究.
- Authors
刘丽娜; 马春子; 张靖天; 何卓识; 霍守亮; 席北斗
- 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.
- Subjects
HEAVY metal content of lake sediments; ECOLOGICAL risk assessment; NITROGEN compounds &; the environment; PHOSPHORUS &; the environment; ORGANIC compounds &; the environment
- Publication
Journal of Agro-Environment Science, 2018, Vol 37, Issue 3, p520
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2017-1131