霍邱县城湖泊沉积物营养盐分布及污染评价

为阐明霍邱县城西湖和城东湖表层沉积物营养盐的空间分布及污染特征，测定了城西湖和城东湖各30个表层沉积物样中的总氮(TN)、总磷(TP)和有机质(OM)含量，分析了其污染水平和来源.结果表明，城西湖总氮(TN)、总磷(TP)、有机质(OM)含量显著高于城东湖，其含量平均值分别为746.23mg·kg^-1、538.38mg·kg^-1、1.17%和470.80mg·kg^-1、492.08mg·kg^-1、0.68%,城西湖的北部及西北部显著高于其他湖区，且大致由北向南呈递减的特点.C/N值表明城西湖和城东湖的有机质主要来源于无纤维束植物和浮游植物，相关性分析表明城西湖和城东湖TN、TP和OM具有同源性；城西湖和城东湖沉积物的TN单项指数(S_TN)的平均值分别为0.67和1.18,而TP单项指数(S_TP)平均值分别为0.42和1.08,表明两湖的TN处于清洁状态而TP处于中度污染状态，综合污染指数(FF)平均值分别为1.51和1.31,整体处于中度污染状态.有机指数...

Distribution and Pollution Assessment of Nutrients in the Surface Sediments of Lake in Huoqiu County

To clarify the spatial distribution and pollution characteristics of nutrients in the surface sediments of Chengxi Lake and Chengdong Lake in Huoqiu County, total nitrogen (TN), total phosphorus (TP), and organic matter (OM) in 30 surface sediment samples of Chengxi Lake and Chengdong Lake were determined, and their pollution levels and sources were analyzed. The results showed that the contents of total nitrogen (TN), total phosphorus (TP), and organic matter (OM) in Chengxi Lake were significantly higher than those in Chengdong Lake, and their average contents were 746.23 mg·kg^-1, 538.38 mg·kg^-1, and 1.17% and 470.80 mg·kg^-1, 492.08 mg·kg^-1, and 0.68%, respectively. The spatial distribution in the north and northwest of Chengxi Lake was significantly higher than that in other areas and decreased from north to south. The C/N value indicated that the organic matter in Chengxi Lake and Chengdong Lake mainly came from unbundled plants and phytoplankton. Correlation analysis showed that total nitrogen (TN), total phosphorus (TP), and organic matter (OM) in Chengxi Lake and Chengdong Lake were homologous. The average values of TN and TP single index (S_TN and S_TP) of sediments in Chengxi Lake and Chengdong Lake were 0.67 and 1.18 and 0.42 and 1.08, respectively, indicating that TN in the two lakes was clean whereas TP was moderately polluted, and the average comprehensive pollution index (FF) was 1.51 and 1.31, respectively. The evaluation of organic index and organic nitrogen index showed that both Chengxi Lake and Chengdong Lake were clean.