不同水深下太湖草/藻型湖区沉积物污染特征及释放通量OA
Depth-related sediment pollution characteristics and release fluxes in phytoplankton-and macrophyte-dominated areas of Lake Taihu
太湖作为一个大型富营养化湖泊,不同湖区沉积物内源污染及释放特征差异显著.以太湖草型湖区胥湖和藻型湖区竺山湖为研究对象,分析不同水深下草/藻型湖区底泥内源污染和氮磷扩散通量的变化规律.结果表明,胥湖和竺山湖沉积物中总氮含量分别为2.59～3.33 g/kg和2.95～3.63 g/kg,总磷含量分别为0.462～0.652 g/kg和0.749～0.916 g/kg.藻型湖区沉积物中营养盐含量显著高于草型湖区,且均随水深变化呈不规律波动.沉积物磷形态分析表明,胥湖沉积物中以钙结合态磷为主,且钙结合态磷在总磷中的占比随水深增加而明显下降;竺山湖沉积物中磷形态以铁结合态磷为主,且铁结合态磷、铝结合态磷和钙结合态磷在总磷中的占比随水深增加而逐步上升.胥湖浅水区域沉积物—水界面可溶性活性磷(SRP)浓度明显高于深水区域,亚铁离子(Fe2+)和氨氮(NH3-N)浓度在不同水深下差别较小;竺山湖浅水区域沉积物—水界面SRP、Fe2+和NH3-N浓度均高于深水区域.胥湖和竺山湖内源释放风险均较小,胥湖NH3-N扩散通量和竺山湖SRP、NH3-N扩散通量均在浅水区域较高.研究结果对于深入理解水深对太湖草/藻型湖区沉积物—水界面氮、磷迁移规律具有重要作用.
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.
Zong Yuqing;Li Hui;Wu Donghao;Shi Yadong;Sheng Huiwen;Yuan Lin;Guo Qing-chun;Zou Yue
Taihu Basin Monitoring Center of Hydrology and Water Resources,Wuxi 214024,P.R.China||Taihu Basin Shallow Lake Ecosystem Observation and Research Station,Ministry of Water Resources,Wuxi 214000,P.R.China||Key Laboratory of Taihu Basin Water Resources Management and Protection of the Ministry of Water Resources,Wuxi 214131,P.R.ChinaWuxi River and Lake Management and Water Resources Management Center,Wuxi 214031,P.R.ChinaTaihu Basin Monitoring Center of Hydrology and Water Resources,Wuxi 214024,P.R.China||Taihu Basin Shallow Lake Ecosystem Observation and Research Station,Ministry of Water Resources,Wuxi 214000,P.R.China||Key Laboratory of Taihu Basin Water Resources Management and Protection of the Ministry of Water Resources,Wuxi 214131,P.R.ChinaTaihu Basin Monitoring Center of Hydrology and Water Resources,Wuxi 214024,P.R.China||Taihu Basin Shallow Lake Ecosystem Observation and Research Station,Ministry of Water Resources,Wuxi 214000,P.R.China||Key Laboratory of Taihu Basin Water Resources Management and Protection of the Ministry of Water Resources,Wuxi 214131,P.R.ChinaTaihu Basin Monitoring Center of Hydrology and Water Resources,Wuxi 214024,P.R.China||Taihu Basin Shallow Lake Ecosystem Observation and Research Station,Ministry of Water Resources,Wuxi 214000,P.R.China||Key Laboratory of Taihu Basin Water Resources Management and Protection of the Ministry of Water Resources,Wuxi 214131,P.R.ChinaTaihu Basin Monitoring Center of Hydrology and Water Resources,Wuxi 214024,P.R.China||Taihu Basin Shallow Lake Ecosystem Observation and Research Station,Ministry of Water Resources,Wuxi 214000,P.R.China||Key Laboratory of Taihu Basin Water Resources Management and Protection of the Ministry of Water Resources,Wuxi 214131,P.R.ChinaTaihu Basin Monitoring Center of Hydrology and Water Resources,Wuxi 214024,P.R.China||Taihu Basin Shallow Lake Ecosystem Observation and Research Station,Ministry of Water Resources,Wuxi 214000,P.R.China||Key Laboratory of Taihu Basin Water Resources Management and Protection of the Ministry of Water Resources,Wuxi 214131,P.R.ChinaTaihu Basin Monitoring Center of Hydrology and Water Resources,Wuxi 214024,P.R.China||Taihu Basin Shallow Lake Ecosystem Observation and Research Station,Ministry of Water Resources,Wuxi 214000,P.R.China||Key Laboratory of Taihu Basin Water Resources Management and Protection of the Ministry of Water Resources,Wuxi 214131,P.R.China
藻型湖区草型湖区沉积物水深内源污染扩散通量
Phytoplankton-dominated areamacrophyte-dominated areasedimentswater depthendogenous pollutiondiffusion flux
《湖泊科学》 2026 (1)
91-101,11
水利部重大科技项目(SKS-2022065)资助.
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