富营养化湖泊刚毛藻建群特征及其影响因素  

The characteristics of Cladophora community and its influencing factors in a eutrophic lake

作　　者：郭亮亮[1,2] 李露 李莉杰[1,2] 李敦海 李根保 GUO Liang-liang;LI Lu;LI Li-jie;LI Dun-hai;LI Gen-bao(State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;University of Chinese Academy of Sciences,Beijing 100049, China)

机构地区：[1]中国科学院水生生物研究所淡水生态与生物技术重点实验室,湖北武汉430072 [2]中国科学院大学,北京100049

出　　处：《中国环境科学》2017年第12期4667-4674,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(31370472);水专项滇池项目(2013ZX07102-005)

摘　　要：为研究富营养化湖泊刚毛藻建群过程及其影响因素,在草海沿岸带水深为5,25,45,65,85cm处分别放置大理石板作为刚毛藻建群的人工基质,监测人工基质上刚毛藻群落的生物量、藻丝长度以及附着硅藻的密度和组成.结果发现,2周后,水下25cm处的刚毛藻群落的生物量最大,为9.0mg/cm2.4周后,水下5cm处刚毛藻群落的生物量为14.0mg/cm^2,是25cm处刚毛藻群落生物量的1.62倍.整个实验期间,水下65,85cm处刚毛藻群落的生物量一直较少,生物量分别为2.86,1.39mg/cm^2.相对其它深度,5cm处刚毛藻藻丝长度最长,最高值为11.8cm.在第6周,水下5cm处刚毛藻群落中附着硅藻的密度最大,为7.8×10~6cell/cm^2.分析结果显示,NH_4^+-N浓度、水下光照强度和SRP浓度是显著影响刚毛藻群落特征(刚毛藻群落生物量、刚毛藻藻丝长度和附着硅藻密度)的因子,而NH_4^+-N浓度和pH值是影响硅藻群落组成的显著性环境因子.In order to study the Cladophora community characteristics and the factors influenced the process in eutrophic lakes,the marble plates were placed in the depth of5,25,45,65,85cm in coastal of Caohai Lake used for the measurement of the biomass of Cladophora community,the length of Cladophora and the density and composition of attached diatom.After two weeks,the biggest biomass of Cladophora community was9.0mg/cm2at underwater25cm.Four weeks later,the biggest biomass of the Cladophora community was14.0mg/cm2at underwater5cm,which was1.62 times that of the Cladophora community underwater25cm.During the experiment,the Cladophora community biomass at65cm and85cm were2.86mg/cm2and1.39mg/cm2,respectively,which are less than those of other depth of water.The longest length of the Cladophora filaments was11.8cm at the depth of5cm.At the6th week,the biggest density of attached diatoms community was7.8×106cells/cm2at the depth of5cm.Statistical analysis indicated that the characteristics of Cladophora community were significantly affected by NH4+-N concentration,underwater light intensity and SRP concentration,and species composition of attached diatom were significantly affected by NH4+-N concentration and pH value.

关 键 词：富营养化 刚毛藻群落 水深 

分 类 号：X524[环境科学与工程—环境工程]