【摘要】 为明确渭河杨凌段浮游硅藻植物群落的特点及生态类型,对采集自杨凌示范区水域的样品进行了显微镜观察,共鉴定到硅藻门植物44个分类单位,包括27种14变种2变型,分别属于2纲6目9科20属,其中优势种有平片针杆藻、梅尼小环藻、小型异极藻具领变种、小型异极藻椭圆变种。小型异极藻具领变种数量最多,是构成浮游植物的主要组成类群,是渭河杨凌段的优势种类。渭河杨凌段浮游植物生物量大,多样性状况较差。更多还原

【Abstract】 Through analysis of the samples from Yangling Reach of Weihe River by microscope,diatoms community and ecological form were estimated. The investigation showed that there were 44 species belonging to 2 classes,6 orders,9 families,20 genera,27 species,14 varieties and 2forms in Yangling Reach. Synedra tabulata( Ag) Kuetz,Cyclotella meneghiniana Kuetz,Gomphonema parvulum var. lagenula( Kuetz) Frenguelli and G. parvulum var. subellipticum Cleve were the dominant phylum. The plentiful species,G. parvulum var. lagenula was dominant in the phytoplankton community. Phytoplankton biomass was high,diversity status was not good.更多还原