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引用本文:许慧萍,杨桂军,周健,秦伯强,张光生,邹华,胡细全.氮、磷浓度对太湖水华微囊藻(Microcystis flos-aquae)群体生长的影响.湖泊科学,2014,26(2):213-220. DOI:10.18307/2014.0207
XU huiping,YANG Guijun,ZHOU Jian,QIN Boqiang,ZHANG Guangsheng,ZOU Hua,HU Xiquan.Effect of nitrogen and phosphorus concentration on colony growth of Microcystis flos-aquae in Lake Taihu. J. Lake Sci.2014,26(2):213-220. DOI:10.18307/2014.0207
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氮、磷浓度对太湖水华微囊藻(Microcystis flos-aquae)群体生长的影响
许慧萍1, 杨桂军1, 周健1, 秦伯强2, 张光生1, 邹华1, 胡细全3
1.江南大学环境与土木工程学院, 无锡 214122;2.中国科学院南京地理与湖泊研究所湖泊环境与科学国家重点实验室, 南京 210008;3.湖北大学资源与环境学院, 武汉 430062
摘要:
大量微囊藻群体的形成和聚集是微囊藻水华形成的重要条件.氮、磷浓度是影响微囊藻群体生长的重要因素之一.为了探讨氮、磷浓度对微囊藻群体生长的影响,本研究以太湖微囊藻水华优势种之一的水华微囊藻作为研究对象,开展了不同氮、磷浓度对水华微囊藻群体生长的影响研究.以近几年太湖微囊藻水华暴发最严重的梅梁湾氮磷比的平均值作参考,氮、磷浓度设置为5个水平组,依次是T1(TN=0.1 mg/L,TP=0.005 mg/L)、T2(TN=1 mg/L,TP=0.05 mg/L)、T3(TN=10 mg/L,TP=0.5 mg/L)、T4(TN=100 mg/L,TP=5 mg/L)和T5(TN=250 mg/L,TP=5.44 mg/L)(BG-11培养基中氮、磷的浓度).结果显示,T1、T2、T3和T4 4组微囊藻群体均增大,且都发现有大于100个细胞的群体形成,群体大小分别为151、217、437和160 cells,而T5组微囊藻群体实验初期增大,实验后期变小,T5整个实验期间未发现有大于100个细胞的群体形成.研究结果表明相对低的氮、磷浓度有利于水华微囊藻群体的生长,而过高的氮、磷浓度则会抑制微囊藻群体生长.本研究结果也表明目前太湖氮、磷浓度有利于水华微囊藻群体的生长,从而有利于微囊藻水华形成.
关键词:  水华微囊藻  群体      太湖
DOI:10.18307/2014.0207
分类号:
基金项目:国家水体污染控制与治理科技重大专项项目(2012ZX07501-001-03,2012ZX07503-002,2011ZX07301-002);国家自然科学基金项目(41101053);国家自然科学基金重点项目(41230744)联合资助
Effect of nitrogen and phosphorus concentration on colony growth of Microcystis flos-aquae in Lake Taihu
XU huiping1, YANG Guijun1, ZHOU Jian1, QIN Boqiang2, ZHANG Guangsheng1, ZOU Hua1, HU Xiquan3
1.School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.School of Resources and Environment, Hubei University, Wuhan 430062, P. R. China
Abstract:
The formation and accumulation of massive Microcystis colonies was important to outbreak of Microcystis blooms. The concentration of nitrogen and phosphorus was one of the important factors affecting growth of Microcystis colony. This study was conducted to reveal the effect of different concentrations of nitrogen and phosphorus on the growth of Microcystis flos-aquae colonies. We took the mean ratio of nitrogen to phosphorus in Meiliang Bay in Lake Taihu as a reference, where was a serious region of Microcystis bloom in the past several years. The concentrations of nitrogen and phosphorus were set up to five treatments:T1:TN=0.1 mg/L, TP=0.005 mg/L; T2:TN=1 mg/L, TP=0.05 mg/L; T3:TN=10 mg/L, TP=0.5 mg/L; T4:TN=100 mg/L, TP=5 mg/L; T5:TN=250 mg/L, TP=5.44 mg/L (the concentration of BG-11 medium). The results showed that the size of M. flos-aquae colonies increased and the sizes of colony above 100 cells were 151, 217, 437 and 160 cells in treatments of T1, T2, T3 and T4, respectively. However, the size of M. flos-aquae colonies increased in initial stage of the experiment and then decreased in later stage of the experiment, and no colony of 100 + cells was found in treatment T5 during the whole experiment. The results indicated that relatively low concentration of nitrogen and phosphorus was beneficial for the growth of Microcystis colony, while high concentration might inhibit growth of Microcystis colony. This study also suggested that current concentration of nitrogen and phosphorus in Lake Taihu was in favor of the growth of Microcystis colonies which was conducive to the formation of Microcystis blooms.
Key words:  Microcystis flos-aquae  colony  nitrogen  phosphorus  Lake Taihu
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