School of Environment, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China.
Environ Sci Pollut Res Int. 2019 Mar;26(8):7476-7485. doi: 10.1007/s11356-018-04059-0. Epub 2019 Jan 18.
Sediment resuspension has been recognized as a crucial internal process in aquatic ecosystems. However, there is still a lack of reliable measuring methods due to the complex hydrodynamic conditions in large shallow eutrophic lakes. In this study, sequential sediment traps (SST) and instantaneous multiple point (IMP) methods were compared at 6 sites located in the littoral zone of Zhushan Bay in Lake Taihu. Results show that the average resuspension rates (RRs) estimated using the IMP method at sites 1 to 6 were 266.39, 272.79, 235.17, 254.95, 392.25, and 483.85 g·md, respectively. While the RRs estimated using the SST method were 195.16, 236.99, 116.76, 156.23, 389.53, and 509.85 g·md, respectively. In wind-disturbed areas, both methods were suitable for RR analysis in large and shallow eutrophic lakes and SST provides high-resolution temporal RR estimations. However, in the areas with cyanobacterial blooms and vegetation cover, the IMP method overestimated the RR. Therefore, SST was more suitable across different conditions in large and shallow eutrophic lakes, providing a simple, accurate, and high-resolution temporal estimation of RR, while furthering our understanding of lake evolution processes.
底泥再悬浮已被认为是水生生态系统中一个至关重要的内部过程。然而，由于大型浅水富营养湖泊中复杂的水动力条件，仍然缺乏可靠的测量方法。本研究在太湖竺山湾湖岸带的 6 个站点比较了顺序沉积物捕集器（SST）和瞬时多点（IMP）方法。结果表明，站点 1 至 6 处使用 IMP 方法估算的平均再悬浮速率（RR）分别为 266.39、272.79、235.17、254.95、392.25 和 483.85 g·md。而使用 SST 方法估算的 RR 分别为 195.16、236.99、116.76、156.23、389.53 和 509.85 g·md。在有风扰动的区域，两种方法都适用于大型浅水富营养湖泊的 RR 分析，SST 提供了高分辨率的时间 RR 估计。然而，在蓝藻水华和植被覆盖的区域，IMP 方法高估了 RR。因此，SST 更适用于大型浅水富营养湖泊的不同条件，提供了 RR 的简单、准确和高分辨率的时间估计，同时进一步了解湖泊演化过程。
