深水型水库藻形态功能组(MBFG)的季节演替特征

Seasonal Succession Characteristics of the Morphologically-based Functional Groups(MBFG) in Deep-water Reservoir

以藻类形态功能组(morphologically-based functional groups,MBFG)藻种在光学显微镜下的形态特征为基础,对具有相同形态特征的藻种进行分组,形成了面向藻类集群形态属性的功能组别.为了解藻类形态功能组在研究深水型水库藻类变化规律中的应用及藻类演替特征,于2011年8月至2013年7月对西安市金盆水库进行采样分析,采用形态功能组分类方法对金盆水库中检测出的藻类进行了分类,结合冗余分析探讨了藻类形态功能组演替及其与环境因子间的相互关系.结果表明,黑河金盆水库中的藻类可以分为5个形态功能组别:Ⅱ、Ⅳ、Ⅴ、Ⅵ、Ⅶ;水库中春夏季多种藻类形态功能组共存,秋冬季藻类形态功能组结构较为单一;在沿水深的纵向演替过程中,各形态功能组的生物密度随水深的增加而减少;在影响形态功能组演替的各个环境因子中,温度对水库表层藻类形态功能组Ⅳ和Ⅵ影响较大;表层以下各研究水层,TN的质量浓度为藻类形态功能群组Ⅵ的显著影响因素.

Morphologically-based functional groups（ MBFG） is the basis for a simple way of distinguishing the phytoplankon to cluster species according to their similar morphological traits observed by optical microscope. In order to understand the application of morphologically-based functional groups（ MBFG） in the research on phytoplankton community structure and variation of deep-water reservoir,as well as the succession characteristics of algae,the Jinpen Reservoir was studied from August2011 to July 2013. Using morphologically-based functional groups（ MBFG）, the phytoplankton communities found in the reservoir were classified to functional groups,and the relations between the morphologically-based functional groups succession and environment cases were explored with redundancy analysis（ RDA） method. The results suggested that five morphologicallybased functional groups were found in the reservoir,namely Ⅱ,Ⅳ,Ⅴ,Ⅵ,Ⅶ; The succession of reservoir algal functional groups had seasonal characteristics,a variety of Morphologically-based functional groups coexisted in spring and summer,while reservoir algal functional groups were relatively simple in autumn and winter; meanwhile, the density of each morphologically-based functional group decreased with the increase of water depth among the environmental factors,morphologically-based functional groups Ⅳ and Ⅵ were respectively affected by temperature; the other water layers of the reservoir morphologically-based functional groups Ⅵ was significantly affected by TN content.