对沙河水库浮游植物种类组成和现存量进行了四季调查 ,测定了其初级生产力。共计检出浮游植物 7门 2 8属 ,其中绿藻门为 1 3属 ,硅藻门和蓝藻门各 5属 ,其它为隐藻门、金藻门及裸藻门。浮游植物的年平均密度和生物量分别为 1 .50× 1 0 5 个 /L和 0 .3 1 2 mg/L。生物量以裸藻和隐藻为主 ,夏季各门类浮游植物均达到最高值。沙河水库浮游植物的初级生产力年平均为 2 .0 97g/m2·d。鲢鱼年总产量约 560 0 0 kg Four seasons of phytoplankton species composition and stock in Shahe Reservoir were surveyed and their primary productivity was measured. A total of 28 phytoplankton genuses were detected, including 13 genus Chlorophyta and 5 genus of Bacillariophyta and Cyanophyta. The others were Cryptophyta, Chrysophyta and Euglena. The annual average density and biomass of phytoplankton were 1.50 × 105 and 0.312 mg / L, respectively. The biomass is dominated by Euglena and Cryptophyta, and the phytoplankton reached its highest value in summer. The annual average primary productivity of phytoplankton in Shahe Reservoir is 2.097g / m2 · d. Annual silver carp production is about 560 000 kg