摘要
为研究浅水富营养湖泊硅藻季节演替的规律,选择南京两个城市湖泊(前湖和月牙湖)作为对象,对水体硅藻和水质进行逐月采样和实验分析.结合数理统计分析手段,对2006年硅藻浓度、种群组合变化及其与环境因子的关系进行了讨论.结果表明:两湖硅藻都呈现较明显的季节演替特点,冬季浮游硅藻组合主要由Cyclostephanos的种类为主,代表了冷水富营养种组合类型;夏季和秋季以Cyclotella atomus和C.meneghiniana暖水耐营养种优势组合为主.硅藻和环境指标月富营养湖泊,春季硅藻丰度增加对初级生产量的贡献很小;随着营养程度的不断提高,温度对浮游硅藻的限制更为突出.
For exploring the seasonal succession of planktonic diatom in shallow eutrophic lakes, two small shallow lakes--Lake Qianhu and Lake Yueya in Nanjing were chosen and monitored monthly in 2006. We discussed the relationship between the diatom density, diatom assemblages and environmental factors by the analyses of CCA. The results showed the obvious seasonal successions of diatom assemblages in the two lakes. Cyclostephanos was the dominant species in winter, representing the cool eutrophic diatom assemblage; while the assemblage changed into Cyclotella atoms and C. meneghiniana dominant in summer and autumn which represented warm and eutrophic assemblage. CCA analysis using the monthly data indicated that temperature did not only control the biomass of diatom, but also affected the seasonal succession of diatom assemblages. The increasing diatom biomass in spring had a little contribution to primary production. When the level of eutrophication was higher, the temperature plays more important role in influencing the planktonic diatom.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2009年第5期693-699,共7页
Journal of Lake Sciences
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-319)
国家自然基金项目(40572177)
