摘要
沉积物内源磷释放往往对湖泊富营养化有着重要影响。运用SMT分级提取法提取鄂东南湖群(网湖、大冶湖、磁湖、梁子湖、保安湖、朱婆湖)表层沉积物的不同形态磷,探究了6个湖泊中磷的赋存特征、影响因素及生物有效性。结果表明:1)鄂东南湖泊总磷(TP)含量为395.81~1404.64 mg/kg,各湖泊TP平均含量大小顺序为网湖>大冶湖>磁湖>梁子湖>朱婆湖>保安湖。2)TP含量以无机磷(IP)为主,IP占TP含量的50%~90%,钙结合态磷(Ca-P)、铁铝结合态磷(Fe/Al-P)、有机磷(OP)次之,Ca-P为94.53~542.85 mg/kg、Fe/Al-P为44.04~461.90 mg/kg、OP为22.59~171.27 mg/kg。3)相关性分析显示TP含量与Fe/Al-P、Ca-P呈显著正相关,多重比较结果表明湖泊间各形态磷含量均存在显著差异,流域内的地质背景、人类活动、水生植物分布以及水动力条件是影响湖泊不同形态磷分布的主要因素。4)生物有效磷(BAP)含量为68.26~717.3 mg/kg,比同区域华阳湖群低,但其分布与Fe/Al-P分布一致。基于岩芯Fe/Al-P垂向变化趋势和沉积物磷的赋存特征,外源工农业污水输入和养殖活动是内源磷积累的主要原因。
The release of endogenous phosphorus(P)from sediments often affects the lake eutrophication significantly.Here,the Standards,Measurements and Testing Programme(SMT)based sequential extraction method was applied to quantify different forms of phosphorus in surface lake sediments of Wanghu,Daye,Cihu,Liangzi,Baoan and Zhupo lakes in eastern Hubei Province,to explore the P occurrence and bioavailability in the aforementioned lakes.The results show that(1)the total P(TP)content in lake sediments in southeastern Hubei ranged from 395.81 to 1400 mg/kg.(2)The TP content was dominated by inorganic P(IP),accounting for 50%-90%of TP,followed by calcium-bound P(Ca-P,94.53-542.85 mg/kg),iron-aluminum-bound P(Fe/Al-P,44.04-461.90 mg/kg)and organic P(OP,22.59-171.27 mg/kg.(3)The TP content correlated significantly and positively with Fe/Al-P,Ca-P.Multiple comparisons revealed significant differences in P contents among the lakes investigated.Geological background,human activities,distribution of aquatic plants and hydrodynamic conditions in the basin are the major factors influencing the distribution of different P forms in lakes.4)The contents of bioavailable P(BAP)were 68.26-717.3 mg/kg,which were lower than those of the Huayang Lake Group in the same region,but the spatial distribution of BAP in sediments was similar to Fe/Al-P.Based on the vertical distribution of Fe/Al-P along the sediment core and the occurrence of sediment phosphorus,the industrial and the agricultural sewage and fish farming activities were the prominent sources for endogenous P accumulated in sediments.
作者
张文
刘小欢
尹刚
姚书春
郑和松
柯华
桂智凡
ZHANG Wen;LIU Xiaohuan;YIN Gang;YAO Shuchun;ZHENG Hesong;KE Hua;GUI Zhifan(College of Urban and Environmental Sciences,Hubei Normal University,Huangshi 435002,China;Research Center for Resource Depletion and Urban Transformation and Development of Hubei Normal University,Huangshi 435002,China;State Key Lab of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Wanghu Lake Wetland Nature Reserve Administration of Huangshi City,Huangshi 435002,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2023年第5期505-515,共11页
Earth and Environment
基金
国家自然科学基金项目(41402152)
湖北省自然科学基金项目(2013CFB062)
湖泊与环境国家重点实验室开放基金项目(2014SKL003)
湖北省教育厅科学技术研究计划青年人才项目(Q20142503)
资源枯竭城市转型与发展研究中心开放基金(KF2022Z02)
湖北师范大学湖泊流域重金属污染机理与生态修复创新团队项目。
关键词
鄂东南
湖泊沉积物
磷形态
生物有效性
eastern Hubei province
lake sediment
phosphorus forms
bioavailability
