| In this paper, the contents of organic matter (OM), total nitrogen (TN) and total phosphorus (TP) in core sediments of Qiandao Lake were determined, the distribution characteristics were analyzed and the pollution status was evaluated. The results showed that the average contents of OM, TN and TP in sediments were 1.44%, 1.86 mg/g and 0.89 mg/g, respectively. The spatial distribution differences were obvious. The pollution in urban bay area and along the main stream of Xin，an River was relatively severe. In terms of vertical distribution, the contents of OM, TN and TP gradually increased from the bottom to the top of the lake. Correlation analysis showed that OM, TN and TP in sediments had high homology. Nitrogen and phosphorus mostly existed in organic form. The ratio of C/N indicated that organic matter in sediments mainly derived from endogenous decomposition of aquatic organisms. The evaluation results showed that the comprehensive pollution index ranged from 1.1 to 4.2, indicating that the lake was heavily polluted on the whole. TP pollution was heavier than TN. The organic index ranged from 0.04 to 0.52, indicating a light pollution level on the whole. |
