太湖表层沉积物中多磷酸盐检出的环境意义  

Detection of polyphosphate in surficial sediments of Taihu Lake and its environmental significance

作　　者：李军 周志华[1] 朱兆洲[2] 陈孝军[3] 王仕禄[1] 汪福顺[4] 

机构地区：[1]中国科学院地球化学研究所//环境地球化学国家重点实验室,贵州贵阳550002 [2]天津师范大学城市与环境科学学院,天津300387 [3]天津市引滦工程于桥水库管理处,天津301900 [4]上海大学环境与化学工程学院,上海200072

出　　处：《生态环境》2007年第3期719-724,共6页Ecology and Environmnet

基　　金：中国科学院创新团队国际合作伙伴计划资助项目;国家重大基础研究计划(973)项目(2006CB403200);国家自然科学基金重点项目(90610037);中国科学院知识创新工程项目(KZCX1-SW-12)

摘　　要：在氮限制型富营养化湖泊中,沉积多磷酸盐（Poly-P）可以用来示踪营养盐磷的输入和湖泊的富营养化过程。太湖是一个典型的磷限制型富营养化湖泊,通过对太湖表层沉积物中总有机碳（TOC）、总氮（TN）、总磷（TP）、氢氧化钠可提取磷（NaOH-P）以及Poly-P的提取分析,初步探讨了太湖营养盐磷输入的历史记录,并揭示了该湖Poly-P的主要来源和保存机制。太湖Poly-P的质量浓度较低,变化范围为0.004-0.065mg·g^-1。NaOH-P占TP组成的22%,是太湖沉积物总磷的主要组成部分之一。结果显示,在湖泊水体藻类生物量较大和NaOH-P是沉积物TP重要组成部分的磷限制型湖泊中,Poly-P也是沉积物磷汇组成的一个重要部分,同时还是一个可以反映由人为磷输入增大导致湖泊富营养化程度加剧的敏感指标。In N-limited lakes, polyphosphate （Poly-P） has often been considered as an important P sink with anthropogenic enrichment, but which has been few reported in P-limited lakes. Taihu Lake is a both P-limited and typical eutrophication lake. The sedimentary records of Poly-P were investigated to recognize its depositional mechanisms and the eco-environment changes in Taihu Lake. Low concentrations of Poly-P in the sediments are found in Taihu Lake, ranging from 0.004 to 0.065 mg·g^-1. The NaOH-P, which accounts for about 22% of sedimentary total P （TP）, is a main composition of sedimentary TP. The concentrations of Poly-P have increased during the latest years （the top 5 cm sediments） with the increase of the nutrients concentrations and the algae biomass, which may be responsible for the deposition ofpoly-P in the sediments of Taihu Lake. In P-limited lakes, Poly-P sedimentation could be an important P sink stored by algae without increasing algae biomass when there is high algae biomass and large fraction of NaOH extractable P （NaOH-P） in sedimentary TP. In addition, the increase of Poly-P concentration in sediments is a sensitive indicator which can reflect the accelerated eutrophication caused by the increased input of anthropogenic P in the past.

关 键 词：总磷 多磷酸盐 氢氧化钠可提取磷 富营养化 太湖 

分 类 号：X131.2[环境科学与工程—环境科学]