Department of Construction Management and Real Estate, Chongqing Jianzhu College, Chongqing, 400039, China.
Department of Ecological Sciences and Engineering, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China.
Bull Environ Contam Toxicol. 2021 Nov;107(5):904-910. doi: 10.1007/s00128-021-03236-1. Epub 2021 Apr 20.
Artificial lakes that form during rapid urbanization often fail to achieve their desired functions, and gradually become eutrophic. Whether the external discharge or internal release of nutrients dominates the eutrophication of urban lakes has rarely been reported. In this study, a lake that had been formed during ten years of urbanization had become hyper-eutrophic. TP mainly contributed to the eutrophication and algal bloom in the lake. While the release potential of TP fluctuated, TN, particularly NH-N, was constantly released from the sediment. Concentrations of anthropogenic metals (Pb, Cu and Cr) increased with the increasing depth of the sediment. Even for a lake that had formed rapidly in a short period, the internal phosphorus released from sediment was 1.9-times higher than that of the external discharge. The dominating contribution of internal pollution from sediment requires more attention to restore and manage these urban waters.
在快速城市化过程中形成的人工湖往往无法达到预期的功能，并且逐渐富营养化。关于城市湖泊富营养化是由外部排放还是内部释放营养物质主导的问题，鲜有报道。在本研究中，一个已经形成十年的城市化湖泊已经变得高度富营养化。TP 主要导致湖泊富营养化和藻类大量繁殖。虽然 TP 的释放潜力存在波动，但 TN，尤其是 NH-N，不断从沉积物中释放出来。人为金属（Pb、Cu 和 Cr）的浓度随着沉积物深度的增加而增加。即使是在短时间内迅速形成的湖泊，从沉积物中释放的内部磷也比外部排放的高出 1.9 倍。这种内部污染的主要贡献需要更多地关注这些城市水域的恢复和管理。
