| 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. |
| 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 |
| 投稿时间：2017-08-19 |
| DOI：10.11654/jaes.2017-1131 |
| 中文关键词: 沉积物 氮 磷 重金属 生态风险 |
| 英文关键词: sediment nitrogen phosphorus heavy metal ecological risk |
| 基金项目:国家水体污染控制与治理科技重大专项（2012ZX07101-002）；黑龙江省青年科学基金项目（QC2013C050） |
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| 中文摘要: |
| 以东北典型湖泊山口湖为研究对象，采用有机指数、有机氮、潜在生态风险指数及地累积指数评价研究区域沉积物氮磷和重金属污染状况，并对沉积物的生态风险进行评估。结果表明：丰水期和枯水期沉积物TN含量均值分别为3968 mg·kg-1和5780 mg·kg-1，TP含量均值分别为1557 mg·kg-1和1787 mg·kg-1，丰水期沉积物中TN、TP含量低于枯水期。丰水期沉积物C/N均值为20.76，说明沉积物中污染物主要来自外源性颗粒态有机物的输入；枯水期沉积物C/N均值为8.91，说明水体中藻类、水生动植物是沉积物中有机物的主要来源。无论是枯水期还是丰水期，山口湖沉积物氮污染处于Ⅳ级水平，受到一定的有机污染，丰水期沉积物TN、TP含量较高的区域位于上游湖叉入湖口，枯水期沉积物TN、TP含量较高的区域位于山口湖主河道及下游。不同水期沉积物中Cd的污染水平相对较高，而Cu、Ni、As、Zn基本未受到污染或污染水平相对较低，枯水期沉积物中重金属具有高生态风险，丰水期沉积物中重金属具有很高生态风险。 |
| 英文摘要: |
| 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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