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引用本文:胡竹君,李艳玲,李嗣新.洱海硅藻群落结构的时空分布及其与环境因子间的关系.湖泊科学,2012,24(3):400-408. DOI:10.18307/2012.0311
HU Zhujun,LI Yanling,LI Sixin.Spatial and temporal distributions of diatom communities and their relationships with environmental factors in Lake Erhai. J. Lake Sci.2012,24(3):400-408. DOI:10.18307/2012.0311
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洱海硅藻群落结构的时空分布及其与环境因子间的关系
胡竹君1,2, 李艳玲1, 李嗣新3
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;2.中国科学院研究生院, 北京 100049;3.水利部中国科学院水工程生态研究所, 武汉 430079
摘要:
于2004-2005年间对洱海水体的硅藻群落进行逐月监测及研究,共发现71个种,分属于18个属.硅藻群落结构的季节变化显著,主要优势种为耐营养的属种.不同季节的硅藻优势种类有明显区别,冬季的主要优势种为Fragilaria crotonensis,春季Aulacoseira ambiguaF. crotonensis的组合占优势地位,夏季以Cyclotella ocellata为主,秋季则A. ambiguaCyclostephanos dubius组合为优势种.空间上除1#点外,硅藻分布虽然在相对丰度上存在一定的南北差异,但优势属种在全湖具有较好的一致性.说明洱海全湖的水质都已处于中富营养状态.对除1#点外的11个采样点的硅藻及水化学数据进行平均,得到逐月数据,通过数理统计分析的手段,探讨硅藻群落变化与环境因子之间的关系,结果表明影响季节尺度硅藻群落发生变化的最主要因子是气象条件,其次是营养盐.
关键词:  硅藻  群落结构  环境因子  冗余分析  洱海
DOI:10.18307/2012.0311
分类号:
基金项目:国家自然科学基金项目(40972114)资助
Spatial and temporal distributions of diatom communities and their relationships with environmental factors in Lake Erhai
HU Zhujun1,2, LI Yanling1, LI Sixin3
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.Institute of Hydroecology Ministry of Water Resource and Chinese Academy of Sciences, Wuhan 430079, P. R. China
Abstract:
A total of 71 diatom species belonging to 18 genera were indentified from Lake Erhai in Yunnan Province (Southwest China) from February 2004 to January 2005. Results revealed a distinct seasonal succession of diatom communities, which dominated by eutrophic-tolerant species. Dominant species were different in each season:Fragilaria crotonensis was the main species in winter; Aulacoseira ambigua and F. crotonensis in spring; Cyclotella ocellata in summer; and A. ambigua and Cyclostephanos dubius in autumn. Except 1#, the dominant diatom species were almost same in the whole lake, with a little difference in percentage between the north and the south part of the lake. It may suggest that the water quality of the whole lake was moderate to heavily polluted. Average monthly data of the diatom and water chemistry of all the sampling sites except 1# and the RDA analysis showed that meteorological condition was the key factor, and the nutrient was the second.
Key words:  Diatom  community structure  environmental factors  RDA  Lake Erhai
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