太湖底泥主要营养物质污染特征分析

Analysis of pollution characteristics of main nutrients in Taihu Lake sediment

为进一步推进太湖流域水环境综合治理工作,给太湖水生态清淤提供决策参考,结合太湖流域管理局2018年组织开展的太湖污染底泥勘察项目调查结果,对太湖底泥中的有机质、氮磷等营养物质的含量及其平面分布、垂向变化情况进行了分析,并与2003年底泥调查结果进行了对比。结果表明:总磷主要集中分布在竺山湖底泥0~30 cm深度内,高含量的总氮和有机质主要分布在竺山湖和东太湖;在外源污染有效控制后,生态清淤工程有利于降低湖区表层底泥的营养物质含量。

In order to further promote the comprehensive treatment of water environment in Taihu Basin and provide decision reference for Taihu Lake water ecological desilting, the content of organic matter, nitrogen, phosphorus and other nutrients in Taihu Lake sediment, as well as their horizontal distribution and vertical changes were analyzed based on the survey results of Taihu Lake polluted sediment investigation project conducted by Taihu Basin Authority in 2018, comparing with those of mud investigation at the end of 2003. The results show that the total phosphorus is mainly distributed in the bottom mud of Zhushan Lake in the depth of 0-30 cm, and the high content of total nitrogen and organic matter are mainly distributed in Zhushan Lake and East Taihu Lake. After the effective control of external pollution, the ecological dredging project is beneficial to reduce the nutrient content of the surface sediment in the lake area.