The algal community structure and seasonal variation in Taizi River catchment,Liaohe River basin

Abstract

2010年9月到2011年9月分4次对太子河流域的藻类植物群落组成、丰度及优势种进行调查分析.共设置17个采样点,经鉴定共有藻类植物8门120属328种(包括21种变种).藻类植物群落以硅藻最多,有36属144种,占总体的43.77%;其次是绿藻,有49属117种,占总体的35.56%;蓝藻居第3位,有22属38种,占总体的11.85%.调查期间,太子河流域藻类植物细胞丰度在夏、秋季较高,丰度平均值分别为6.80×10⁷和3.29×10⁷cells/L;在春季较低,丰度平均值为1.36×10⁷cells/L.优势度分析显示,太子河流域各季节的藻类植物优势种都在5种以上,主要优势种有巨颤藻(Oscillatoria princeps Vauch.)、链丝藻(Hormidium flaccidum(Kütz.)Br.)、偏生毛枝藻(Stigeoclonium subsecundum(Kütz.)Haz.)等.藻类植物的Jaccard种类相似性指数在0.19~0.46之间.太子河流域藻类植物种类组成及细胞丰度均有明显的季节变化.;To understand the algal community structure,cell abundance and dominant species,Taizi River catchment,Liaohe River basin were investigated four times,from September 2010 to September 2011.Algae,including 8 phyla,120 genera,328 species (including 21 varieties) were identified from 17 sampling sites.Bacillariophyta were the dominant algae and included 36 genera,144 species,accounting for 43.77% of the algae.Chlorophyta,with 49 genera,117 species,accounted for 35.56% of the algae.Cyanophyta,included 22 genera,38 species and accounted for 11.85% of the algae.The cell abundance of algae was higher in summer and autumn,which were 6.80×10⁷ and 3.29×10⁷ cells/L,respectively.However,it was lower in spring with 1.36×10⁷ cells/L.This study also demonstrated that the dominant species of algae in Taizi River catchment were more than five, including Oscillatoria princeps Vauch.,Hormidium flaccidum (Kütz.) Br.and Stigeoclonium subsecundum (Kütz.) Haz.ect.Species Jaccard index of the algae varied from 0.19 to 0.46.Both algal community structure and cell abundance have obvious seasonal variation in Taizi River catchment.