• 关键词：附泥藻类  营养盐  太湖  空间异质性  生物量

• 基金项目：国家自然科学基金（No.41471446）；南京信息工程大学大学生实践创新训练计划项目（教发[2017]）

• 宋玉芝
• 1. 南京信息工程大学应用气象学院, 江苏省农业气象重点实验室, 南京 210044;2. 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044

• 薛艳
• 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044

• 徐建强
• 南京信息工程大学环境科学与工程学院, 江苏省大气环境与装备技术协同创新中心, 南京 210044

• 王宇佳
• 1. 南京信息工程大学应用气象学院, 江苏省农业气象重点实验室, 南京 210044

• 摘要：为了揭示富营养化浅水湖泊附泥藻类空间分布及其与环境营养盐之间的关系，于2015年6月9—15日对太湖进行高密度布点采样，研究了太湖表层沉积物上附泥藻类生物量及表层沉积物和水柱中氮、磷等营养盐含量的空间分布特征及其相互关系.结果表明，太湖附泥藻类生物量（以叶绿素a表征）空间异质性明显，最小值为0.07 μg·g^-1，最大值为1.66 μg·g^-1，平均值为0.34 μg·g^-1.附泥藻类生物量在太湖西北部及东太湖较高，其次是贡湖湾、梅梁湾及东部沿岸，在西南部湖区较低；太湖水体中氮、磷等元素含量也存在明显的空间变化，水体中氮、磷含量在竺山湾、梅粱湾及太湖西部明显高于其它湖区；太湖表层沉积物中总有机碳（TOC）、氮、磷等元素含量空间异质性显著，表层沉积物中总磷及各种形态磷含量的空间分布特征与水体中总氮、总磷分布特征类似，表层沉积物总氮及TOC的含量在太湖西北部（包括竺山湾）、梅梁湾、东部湖区（包括东太湖、胥口湾）较高，在西南部湖心区较低；太湖附泥藻类生物量与水体氮、磷含量、沉积物氮、磷及不同形态磷（Ca-P除外）含量均呈显著正相关关系（r≥0.18，p<0.05）.由此可见，太湖附泥藻类生物量的空间异质性既受水体氮、磷浓度的影响，也受沉积物氮、磷等营养水平的制约.本研究结果可为进一步研究附泥藻类在太湖生态系统中功能，以及深入探求太湖富营养化治理途径提供一定的理论依据.

• Abstract：To study relationship between epipelic algae and the environmental nutrients in the eutrophic shallow lakes, epipelic algae and nutrients from surface sediment & the overlying water in Lake Taihu were analyzed by high density sampling for the period of June 9—15, 2015. The results showed that there was obvious spatial heterogeneity of epipelic algal biomass(Chl. a), with the average, minimum and maximum value of 0.34 μg·g^-1, 0.07 μg·g^-1, and 1.66 μg·g^-1, respectively.High epipelic algal biomass was founded in northwestern and eastern Lake Taihu,followed by Gonghu Bay, Meiliang Bay and the eastern coast. Relatively low biomass was in the southwest Lake Taihu.Total organic carbon (TOC), nitrogen and phosphorus from surface sediments, and nitrogen and phosphorus from overlying water in Lake Taihu exhibited distinct spatial diversity. Concentrations of nutrients were obviously higher in the overlying water from the Zhushan Bay, Meiliang bay and the west Lake Taihu than those from any other region of Lake Taihu. The spatial distribution of TP and various forms of phosphorus in the surface sediment was consistent with that of nutrients in the overlying water, and the spatial distribution of TN and TOC in the surface sediment was similar to that of epipelic algal biomass. Epipelic algal biomass was significantly correlated with nitrogen and phosphorus in water, and there was also significant relationship between epipelic algal biomass and TN, TP, TOC and various forms of phosphorus(except Ca-P) in the surface sediment(r≥0.18, p<0.05). In general, the spatial heterogeneity of the existing epipelic algal biomass was influenced by the concentrations of nitrogen and phosphorus in water, and the levels of nitrogen and phosphorus and various forms of phosphorus in the surface sediment. The results of this study provide a theoretical basis for the further understanding the functions of epipelic algae in the ecosystem of Lake Taihu, and provide a theoretical basis for the further research on the eutrophication control in Lake Taihu.

• Key words：epipelic algae  nutrient  Taihu Lake  spatial heterogeneity  biomass

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