营养盐及Ca^(2+)对微囊藻和栅藻生长及竞争的影响  

Effect of Nutrient Conditions and Ca^(2+) on the Growth and Competition of Microcystis aeruginosa and Scenedesmus obliquus

作　　者：赵联芳[1,2] 丁小燕[2] 陆琳 李明[4] 

机构地区：[1]教育部浅水湖泊重点实验室 [2]河海大学环境学院,江苏南京210098 [3]溧阳市水利局,江苏溧阳213300 [4]西北农林科技大学资源与环境学院,陕西杨凌712100

出　　处：《环境科学与技术》2014年第1期13-17,59,共6页Environmental Science & Technology

基　　金：国家自然科学基金(51209070)

摘　　要：为了解营养盐及Ca2+浓度对铜绿微囊藻和斜生栅藻生长及竞争关系的影响,以M11培养基为基础,设置了不同的营养盐水平和Ca2+浓度组,进行了2种藻的单独培养试验和混合培养试验。结果表明:在单独培养试验中,2种藻在试验Ca2+浓度范围内的生长规律均为:超富营养条件>富营养条件>贫营养条件,其中铜绿微囊藻的生物量总体表现为随Ca2+浓度的升高而减少,而斜生栅藻的生物量变化规律不明显;在混合培养试验中,贫营养水平条件下,在试验Ca2+浓度范围内斜生栅藻的竞争生长能力一直强于铜绿微囊藻,而在富营养和超富营养水平条件下,低Ca2+浓度组(≤20 mg/L)铜绿微囊藻的竞争生长能力强于斜生栅藻,高Ca2+浓度组(100 mg/L)其竞争生长能力不如斜生栅藻。In order to understand the effect of nutrient conditions and Ca2＋ concentration on growth and competition of Microcystis aeruginosa and Scenedesmus obliquus, the monoculture and co-culture experiments of M. aeruginosa and S. obliquus were done based on Mll medium with different concentrations of nutrients and Ca2＋. Results indicated that in monoculture system both the two algae species grew best under hyper-eutrophic condition, followed by eutrophic condition and then oligotrophic condition under varying concentrations of Ca2＋, among which the biomass of M. aeruginosa decreased with the increase of Ca2＋ concentration, while the biomass of S. obliquus did not change regularly. In the co-culture system, the competition ability being dominant species of S. obliquus was stronger than M. aeruginosa under ohgotrophic condition. Under eutrophic and hyper-eutrophic conditions, the competition ability being dominant species of M. aeruginosa was stronger when the concentration of Ca2＋ was less than 20 mg/L, while the competition ability of S. obliquus was stronger when the concentration of Ca2＋ was as high as 100 mg/L.

关 键 词：营养水平 Ca2+浓度 铜绿微囊藻 斜生栅藻 竞争 

分 类 号：X172[环境科学与工程—环境科学]