环境因子对香溪河春季藻类生长影响的模拟实验_龙天渝.pdfVIP

中国环境科学 2011,31(2) ：327~331 China Environmental Science 环境因子对香溪河春季藻类生长影响的模拟实验 * 龙天渝 ,周鹏瑞,吴 磊 (重庆大学三峡库区生态环境教育部重点实验室,重庆 400045) 摘要：2010 年 3~5 月间,分 3 批次采集了香溪河水样, 以水体营养盐浓度、水温、光强和流速为环境因子, 以 Chla 比增长率为评价指标,在 4 室内进行 L (3 ) 的正交藻类培养实验,研究了环境因子对春季优势硅藻生长的影响.结果表明,在实验所设定的水平范围内,水体营养盐浓度 9 总氮(TN)为 3.5mg/L、总磷(TP)为 0.3mg/L,水温 20 ℃,光强为 4700lx 以及流速为 0.1m/s 时,最适宜藻类生长.4 因子对藻类生长影响大小依 次为光强、流速、水温、营养盐浓度.流速在 0.05m/s 和 0.1m/s 的情况下,藻类生长率明显高于静水.当 TN1.5mg/L,TP0.1mg/L 时,增加 TN、 TP 浓度可显著促进藻类生长;当 TN 、TP 浓度分别达到 3.5mg/L、0.3mg/L 时, N、P 浓度的增加对藻类生长影响甚微. 关键词：香溪河；正交实验；比增长率；适宜生长条件 中图分类号：X522 文献标识码：A 文章编号：1000-6923(2011)02-0327-05 The simulating experiment for the impacts of environmental factors on Spring algae growth in Xiangxi River. * LONG Tian-yu , ZHOU Peng-rui, WU Lei (Key Laboratory of the Three Gorges Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China). China Evironmental Science, 2011,31(2)：327~331 Abstract ：Three batches of water samples were collected from Xiangxi River between March to May 2010, and the L 4 9(3 ) orthogonal experiments of algae growth were conducted in laboratory. Nutrient concentrations in water, water temperature, light intensity and water flow velocity were selected as environmental factors, and the growth rate of Chla was taken as evaluation index. The effects of environmental factors on the growth of preponderant diatoms in spring were studied. The optimal conditions for algal growth under the condition of the orthogonal experiments were 3.5mg/L for total nitrogen (TN), 0.3mg/L for total phosphorus (TP), 20℃ for water temperature, 4700lx for light intensity and 0.1m/s for flow velocity. The degree of i