包河浮游植物与水质评价

根据对包河浮游植物群落调查,1987年共检出163种,分隶于67属、8门;藻总量年平均达42678.7×10~4个/升(细胞数,或个体数为38071.9×10~4个/升);以绿藻占绝对优势,在湖区各样点群落组成中均居各类群之首,其中小球藻(Chlorella spp.)为优势种;其次为蓝藻,其平裂藻(Merismopedia sp.)可为亚优势种。根据藻类数量、生物量及指示种评价,该水体已受到α—中度污染,属绿藻、蓝藻型α—富营养型湖泊,与理化指标评价结论基本相符。

Study on Phytoplankton in Baohe Lake and an Evaluation of Water Quality

The data from investigations of phytoplankton community in 1987 re- ported that there were 163 species belonging in 67 genera and 8 phyla in Baohe Lake.The annual mean density of phytoplankton reached 42678.7 ×10~4 per litre for ceils or 38071.9×10~4 per litre for individuals.The ab- solutely predominant species consisted of green algae especially Chlorella, their abundance when all seasons were considered attained 69%,but in spring,it was up to 99.6%,.At various sampling stations,green algae were also the dominant ones in the composition of planktonic algae community, the aveerage abundance reached 87%.The less important species were blue- green algae primarily Merismopedia,the annual average abundance in spatial and temporal distribution of planktonic algae were 10% and 24% respectively. By rising the biological parameters including population densities i.e. individual numbers and dry weights(biomass),as well as saprobic indi- cators,the waker quality of Baohe Lake was evaluated.It might be consi- dered that the lake has suffered from α-moderate pollution and belongs in green and blue-green algae-α-eutrophic one.This conclusion agrees in the main with the evaluation by means of physical and chemical parameters.