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当前位置: 首页 > 文章 > 东湖沿岸带底栖藻类群落的时空变化 水生生物学报 2007,31 (6) 836-842
Position: Home > Articles > SPATIAL AND TEMPORAL VARIATION OF BENTHIC ALGAL COMMUNITIES IN THE LITTORAL ZONE OF LAKE DONGHU Acta Hydrobiologica Sinica 2007,31 (6) 836-842

东湖沿岸带底栖藻类群落的时空变化

作  者：
裴国凤;刘国祥;胡征宇
单  位：
中国科学院水生生物研究所
关键词：
底栖藻类;东湖;时空变化;沿岸带
摘  要：
武汉东湖是一个浅水富营养湖泊,其沿岸带底栖藻类群落的季节分布特征明显,夏季的优势种群是一些体积很小的硅藻类曲壳藻(Achnanthes spp.),其他大部分季节是绿藻门的团集刚毛藻(Cladophora glomerata)和硅藻门的变异直链藻(Melosira varians)。不同样点间的底栖藻类现存量差异不显著,但优势种类不同,以团集刚毛藻为优势的绿藻在处于中富营养区域的磨山样点比例最高,以变异直链藻为优势种的硅藻在严重富营养化的水果湖样点中比例最高。底栖藻类月平均现存量(以叶绿素a计)的时间变化格局为夏季最低(41.5μg/cm2),逐渐增加到秋、冬季节的最高峰值(55.3μg/cm2)。造成东湖夏季底栖藻类现存量低的原因是雨季水体环境的不稳定性和水位升高造成的低光照。不同样点间的chlb、chlc及chlb/a、chlc/a值具有显著差异,分析这种差异显示:在东湖的富营养化条件下,过渡的富营养化能增加底栖藻类群落中硅藻的比例,却降低了绿藻的比例;不同环境条件下的底栖藻类群落结构具有特异性,分析底栖藻类群落结构可以用来评价水环境健康状况。东湖底栖藻类现存量的季节变化规律与浮游藻类不同,它和水温成显著的负相关,但温度和浮游藻类并不是影响东湖沿岸带底栖藻类生物量变化的直接因子。团集刚毛藻等底栖丝状藻类给各种底栖动物提供了食物和栖息环境,在东湖生态系统中具有重要的作用和功能。
译  名：
SPATIAL AND TEMPORAL VARIATION OF BENTHIC ALGAL COMMUNITIES IN THE LITTORAL ZONE OF LAKE DONGHU
作  者：
PEI Guo-Feng1,2,LIU Guo-Xiang1 and HU Zheng-Yu1(1.Institute of Hydrobiology,the Chinese Academy of Sciences,Wuhan 430072;2.College of life Sciences,South-Central University for Nationalities,Wuhan 430074)
关键词：
Benthic algae;Donghu Lake;Spatial and temporal variation;Littoral
摘  要：
Lake Donghu is a shallow eutrophic lake,dominant population compositions of the benthic algal communities presented significantly seasonal patterns in the littoral zone of Lake Donghu,Cladophora glomerata and Melosiravarians were the most important species during all seasons except summer,and some species of Achnanthes dominated the littoral zone in summer.Although benthic algal biomass of different sites was slight different,dominant species was significantly different.C.glomerata was the largest fraction at moderately eutrophic site C and M.varians contributed the most biomass at hypereutrophic site A.In summer,monthly mean benthic algal biomass was the minimum with chl a 41.5 μg/cm2,it increasing to peak biomass with chl a 55.3 μg/cm2 at autumn or winter.The low summer biomass was the results of physical factors such as instability of condition caused by raining and the weak of light because of water level rising.The content of chl b and chl c,the ratios of chl b/a and chl c/a among different sites had significant difference.These results suggested that the heavy eutrophic increased the relative proportions of diatoms,meantime decreased the ratio of green algae in the benthic algal communities.It also suggested that the community structure of benthic algae were good biotic indicators for the lake ecosystem health status.The seasonal patterns of benthic algae biomass were different from those of phytoplankton,meanwhile,it was negatively correlated with water temperature.It indicated that water temperature and phytoplankton were not the direct factors on the benthic algal community in the littoral zone of the lake Donghu.C.glomerata offered foods and available habitat for invertebrates,and it played an important role in the ecosystem function of Donghu Lake.

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