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引用本文:孙千千,朱伟,李明.太湖贡湖湾和梅梁湾微囊藻群落的时空分布及其驱动因子.湖泊科学,2015,27(5):865-872. DOI:10.18307/2015.0512
SUN Qianqian,ZHU Wei,LI Ming.Spatial and temporal variations of Microcystis colonies and their influencing factors in Gonghu Bay and Meiliang Bay of Lake Taihu. J. Lake Sci.2015,27(5):865-872. DOI:10.18307/2015.0512
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太湖贡湖湾和梅梁湾微囊藻群落的时空分布及其驱动因子
孙千千1, 朱伟1,2, 李明3
1.河海大学环境学院, 南京 210098;2.水资源高效利用与工程安全国家工程研究中心, 南京 210098;3.西北农林科技大学资源环境学院, 杨凌 712100
摘要:
于2010年7月至2011年6月期间,对太湖贡湖湾及梅梁湾微囊藻的种类组成及其群落的时空分布差异进行调查,并探讨影响微囊藻群落时空分布的环境因子.结果表明,7-11月太湖贡湖湾和梅梁湾都表现为鱼害微囊藻(Microcystis ichthyoblabe)、惠氏微囊藻(M. wesenbergii)及铜绿微囊藻(M. aeruginosa)顺次成为优势种的演替过程,其余时间段内以鱼害微囊藻及其它微囊藻为主.通过CCA分析环境因子与微囊藻属内各种类之间的关系,发现温度是驱动其季节演替的主要因素.两个湖湾之间及同一个湖湾内中心与岸边区域的微囊藻种属分布差异不明显.但是受到风的作用,两个湖湾中下风向位置的微囊藻细胞丰度较高.惠氏微囊藻和铜绿微囊藻更易受到风的影响而向下风向位置迁移,这是因为惠氏微囊藻和铜绿微囊藻群体粒径相对较大,易于漂浮在表层而通过表层迁移聚集于下风向处.可见风引起的表层迁移是影响微囊藻群落空间分布的重要因素.
关键词:  太湖  微囊藻  季节演替  时空分布    贡湖湾  梅梁湾
DOI:10.18307/2015.0512
分类号:
基金项目:江苏省科技基础设施建设计划项目(BM2013013)和国家自然科学基金项目(51278165)联合资助.
Spatial and temporal variations of Microcystis colonies and their influencing factors in Gonghu Bay and Meiliang Bay of Lake Taihu
SUN Qianqian1, ZHU Wei1,2, LI Ming3
1.College of Environment, Hohai University, Nanjing 210098, P. R. China;2.National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing 210098, P. R. China;3.College of Resources and Environment, Northwest Agriculture and Forest University, Yangling 712100, P. R. China
Abstract:
Spatial and temporal variations of Microcystis species composition in Gonghu Bay and Meiliang Bay in Lake Taihu were observed from July 2010 to June 2011. The relationship between seasonal succession of Microcystis colonies and environmental factors was also analyzed. The results showed that M. ichthyoblabe, M. wesenbergii and M. aeruginosa were dominated successively during July to September, and only M. ichthyoblabe and other Microcystis can be found in winter and early spring. CCA analysis revealed that temperature was the main factor driving this seasonal succession. No difference was found in spatial distribution of Microcystis between the two bays, nor was that between the central and coastal areas in the same bay. However, the cell abundance of Microcystis in the downwind area was greater than that in the upwind area, especially that of M. wesenbergii and M. aeruginosa. The size of M. wesenbergii and M. aeruginosa colonies was relatively larger, which made them float to the surface and migrate by the wind much easier. Thus, it was concluded that surface migration caused by wind was an important factor in the spatial distribution of Microcystis colonies.
Key words:  Lake Taihu  Microcystis  seasonal succession  spatial and temporal distribution  wind  Gonghu Bay  Meiliang Bay
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