湖泊科学2026，Vol.38Issue(1)：91-101,11.DOI:10.18307/2026.0112
不同水深下太湖草/藻型湖区沉积物污染特征及释放通量
Depth-related sediment pollution characteristics and release fluxes in phytoplankton-and macrophyte-dominated areas of Lake Taihu
摘要
Abstract
Lake Taihu is a large eutrophic lake.Significant variations were observed in the endogenous pollution and release char-acteristics of sediments between phytoplankton-and macrophyte-dominated areas of the lake.The present study aimed to investigate and analyze the variations in endogenous pollution and nitrogen and phosphorus diffusion fluxes in Lake Xuhu(macrophyte-domina-ted area)and Zhushan Bay(phytoplankton-dominated area)with different water depths.The results demonstrated that:The total nitrogen content in the sediments of Lake Xuhu and Zhushan Bay was found to be between 2.59 and 3.33 g/kg and between 2.95 and 3.63 g/kg,respectively.The total phosphorus content was found to be between 0.462 and 0.652 g/kg and between 0.749 and 0.916 g/kg,respectively.The nutrient content of the sediments in the phytoplankton-dominated area was found to be signifi-cantly higher than that in the macrophyte-dominated area,and the content exhibited fluctuations that were irregular in nature with respect to changes in water depth.Phosphorus speciation analysis of sediments demonstrated that Ca-P constituted the predominant sediments in Lake Xuhu,and the proportion of Ca-P in total phosphorus exhibited a marked decrease with increasing water depth.The phosphorus morphology in the sediments of Zhushan Bay was dominated by Fe-P,and the proportions of Fe-P,Al-P and Ca-P in the total phosphorus gradually increased with the increase of water depth.The soluble active phosphorus(SRP)content at the sediment-water interface in the shallow water area of Lake Xuhu was significantly higher than that in the deep-water area,while the difference in Fe2+and ammonia nitrogen(NH3-N)concentrations between different water depths was relatively small.The SRP,Fe2+and NH3-N contents at the sediment-water interface in the shallow water area of Zhushan Bay were found to be higher than those in the deep-water area.The endogenous release risk of Lake Xuhu and Zhushan Bay was determined to be minimal,and the diffusion fluxes of NH3-N in Lake Xuhu and SRP,NH3-N in Zhushan Bay were found to be higher in shallow water areas.The re-sults obtained are of great significance in understanding the nitrogen and phosphorus migration of water depth at the sediment-water interface in the phytoplankton-and macrophyte-dominated areas of Lake Taihu.关键词
藻型湖区/草型湖区/沉积物/水深/内源污染/扩散通量Key words
Phytoplankton-dominated area/macrophyte-dominated area/sediments/water depth/endogenous pollution/diffusion flux引用本文复制引用
Zong Yuqing,Li Hui,Wu Donghao,Shi Yadong,Sheng Huiwen,Yuan Lin,Guo Qing-chun,Zou Yue..不同水深下太湖草/藻型湖区沉积物污染特征及释放通量[J].湖泊科学,2026,38(1):91-101,11.基金项目
水利部重大科技项目(SKS-2022065)资助. （SKS-2022065）
