Studies on the phytoplankton development trend in Lake Fuxian, China

Abstract

对二十多年来抚仙湖表层湖水中藻类的第一手监测资料做了比较系统的分析研究，以揭示其发展趋势与成因．结果表明，抚仙湖浮游植物生物量增长了10．5倍，种群结构从45种增加到78种，主要原因是人湖TN、TP滞留率高达88．5%和93%，星云湖泄水高浓度藻量，为抚仙湖藻类增长提供了种源及营养源．;Analysis was carried out on the monitoring data of phytoplankton in the top layer of Lake Fuxian since 1980. It revealed that the phytoplankton community has been developing on both species diversity and total biomass in the past two decades. The species has increased from 45 to 78, and the biomass has increased 10. 5 times. The dominant forcing factor for the development was the accumulation of nitrogen and phosphorous in the lake, the retention radio of nitrogen and phosphorous was as high as 88.5% and 93% in the lake. The source of increased species was Lake Xingyun in the drainage basin of Gehe River, the largest inflow river of Lake Fuxian.