浅水湖泊底栖附泥藻类分布特征、影响因子及其对内源磷滞留的影响

项目名称： 浅水湖泊底栖附泥藻类分布特征、影响因子及其对内源磷滞留的影响

项目编号： No.41471446

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 宋玉芝

作者单位： 南京信息工程大学

项目金额： 90万元

中文摘要： 底栖附泥藻类作为浅水湖泊重要的初级生产者，其生物量、群落组成及其代谢活动在内源磷循环中扮演着重要角色，但其具体分布特征和影响因子不是很清楚。本项目拟以大型浅水湖泊－太湖为研究区域，野外观测和室内模拟试验相结合，利用叶绿素荧光技术及常规的实验方法观测太湖沉积物上附泥藻类群落组成、生物量及光合特性，分析其时空变化及其影响因素；在此基础上，室内模拟研究水体氮、磷水平及光照水平对附泥藻类群落组成、生理代谢以及体内磷含量的影响；与此同时，利用微电极技术、磷同位素示踪技术研究附泥藻类光合作用昼夜变化及其对周围环境磷行为的影响，明确附泥藻类对系统内源磷释放影响的机制,结合野外调查数据,初步了解浅水湖泊底栖附泥藻类对内源磷滞留效应影响的大小。这些研究既丰富了水生生态系统底栖藻类生态生理学及磷生物地球化学过程的理论，也为大型浅水富营养化湖泊治理与管理提供理论。

中文关键词： 浅水湖泊；附泥藻类；影响因子；滞留效应；内源磷

英文摘要： Benthic epipelic algae is the important primary producer and its biomass, community composition play an important role in internal phosphorus cycle in shallow lake, but its distribution character and its impact factor are still not cleared. This project would be carried out in Lake Taihu, a large shallow eutrophic lakes, to investigate the spatial-temporal variation of biomass, community composition and photosynthesis characteristic of benthic epipelic algae and its relationship with environmental factors using chlorophyll fluorescence technique and routine method;the effects of the major ecological factors such as light and nutrients on phosphorus metabolism of benthic epipelic algae were also carried out in the laboratory simulation system; Meanwhile, effects and mechanisms of diurnal photosynthesis variation of periphytic algae on phosphorus loading were studed by utilizing isotope tracer techniques and microelectrode techniques . Combining field survey, anaysis on the effect of benthic epipelic algae on internal phosphorus retention capacity was carried out in Lake Taihu. the results of this project would not only enrich theories of ecophysiology of benthic algae and phosphorus biogeochemical processes in aquatic ecosystem, but also provide a theoretical basis for the treatment and management of large shallow eutrophic lakes.

英文关键词： shallow lake;epipelic algae;influence factor;retention effect;internal phosphrous