摘要
1987年1—12月对北京4海藻类群落结构进行了逐月的调查。结果表明,4个海藻类群落结构存在明显差异。由西海至前海藻类数量逐渐下降,种类和多样性指数不断上升,前海数量最低,年均为92.7万个/l,种类多达80属126种;至北海藻类数量剧增,年均达2237.0万个/l,种类和多样性指数则最低。前3个海以贫养性及中养性的硅藻占优势,到北海被喜营养的蓝藻所取代,4个海藻类的数量随水温、BOD_5、COD、TN、TP等指标的上升而增加,随水体透明度的上升而降低。用藻类学指标对4海营养水平评价结果为:西海富营养略偏中,后海和前海中营养略偏富,北海富营养。
The lake Liuhai is consisted of 6 small lakes located in central urban area of Beijing city (Fig.1)The investigation of algal community related to the trophic level in lake Liuhai was carried out monthly through Jan.to Dec.1987 The results obtained on the first 4 lakes are as follows.1. The algal species, density and diversity index in the lakes appeared obvious horizontal variations, and the number and diversity index of species in lake Shishahai, i. e., Lakes Xihai, Houhai and Qianhai, were remakbly higher than that in lake Beihai. On the contrary, the density of algae in lake Shishahai was remakbly lower than that in Beihai, Instead of cleanliness-loving species, the pollution-resisting species of algae are dominant species in Beihai. This results indicated that the trophic level of lake Beihai was much higher than that of lake Shishahai.2. It was found that the algal species and density in the four lakes exhibited obviously seasonal fluctuations. The highest content appeared in summer and autumn,and the lowest in winter.This phenomenon was light in lake Shishahai.3. The results from a correlation analysis of algal density with some ecoloogical factors in lakes indicated that the algal number increases as watertemperature, water colour, total phosphorus, total nitrogen, BOD5, COD, suspended solid increase but as water transparency decreases.4. The community successions of algae are well coincided with the variations of water quality. According to the date of algal communities,the water quality of the lake Shishahai belongs to mesoeutrophic lake, and lake Beihai is eutrophic.
出处
《生态学报》
CAS
CSCD
北大核心
1992年第2期173-180,共8页
Acta Ecologica Sinica
关键词
群落结构
水体营养
水质
藻类
algae, lake, water quality, bioassessment, eutrophication.
