State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210046, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Bull Environ Contam Toxicol. 2021 Jan;106(1):10-17. doi: 10.1007/s00128-020-02891-0. Epub 2020 May 30.
Improvement of water quality has frequently been delayed due to high recycling rates of nutrients across the sediment-water interface in a reservoir. Diffusive fluxes and annual loads of ammonia nitrogen (NH-N) and phosphate (PO-P) in sediments from Guanting Reservoir (GTR) were estimated according to their vertical distribution. The average contents of NH-N and PO-P in surface pore water were higher by factors of 6.9 - 11.7 and 1.3 - 6.4 than those in overlying water, respectively. The ranges of fluxes were 1.59 - 13.0 (mg m d) for NH-N, and 0.002 - 0.196 (mg m d) for PO-P. The annual load contributions from sediments of GTR were 659 t a for NH-N and 4.83 t a for PO-P. Notably, the upstream of GTR accounted for 50.7% annual loads for NH-N, while the downstream contributed 71.2% loads to PO-P. This study will better inform future environmental management for the reservoir.
由于水库沉积物-水界面中养分的高循环率，水质的改善经常被推迟。根据垂直分布，估算了官厅水库（GTR）沉积物中氨氮（NH-N）和磷酸盐（PO-P）的扩散通量和年负荷。表层孔隙水中的 NH-N 和 PO-P 平均含量分别比上覆水中的含量高 6.9-11.7 倍和 1.3-6.4 倍。NH-N 的通量范围为 1.59-13.0(mg m d)，PO-P 的通量范围为 0.002-0.196(mg m d)。GTR 沉积物的年负荷贡献分别为 659 t a 的 NH-N 和 4.83 t a 的 PO-P。值得注意的是，GTR 的上游占 NH-N 年负荷的 50.7%，而下游对 PO-P 的负荷贡献为 71.2%。本研究将更好地为水库的未来环境管理提供信息。
