农业环境科学学报2018，Vol.37Issue(3)：520-529,10.DOI:10.11654/jaes.2017-1131
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
Distribution characteristics of pollution from nitrogen,phosphorus,and heavy metals in sediments of Shankou Lake in Northeast China
摘要
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 sea-sons were 3968 mg·kg-1and 5780 mg·kg-1(total nitrogen,TN),and 1557 mg·kg-1and 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 sedi-ments in the wet season(average:20.76)indicated exogenous particulate organic matter was the main source of pollutants.The low C/N ra-tio 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.关键词
沉积物/氮/磷/重金属/生态风险Key words
sediment/nitrogen/phosphorus/heavy metal/ecological risk分类
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刘丽娜,马春子,张靖天,何卓识,霍守亮,席北斗..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[J].农业环境科学学报,2018,37(3):520-529,10.基金项目
国家水体污染控制与治理科技重大专项(2012ZX07101-002) （2012ZX07101-002）
黑龙江省青年科学基金项目(QC2013C050)Project supported:Mega- projects of Science Research for Water Environment Improvement(2012ZX07101- 002) （QC2013C050）
The Youth Science Foundation of Heilongjiang Province,China(QC2013C050) （QC2013C050）
