Structure of Phytoplankton Community and Evaluation of Water Quality in Yuanhe River
袁河浮游藻类群落结构与水质评价

Sampling was carried out in March and June 2010 in order to study structure of phytoplankton community and evaluation of water quality in River Yuanhe.Total 6 phylum,45 genera and 89 species of phytoplankton were identified.The phytoplankton abundance ranged from 1.79×104 cells/L to 401×104 cells/L,and biomass ranged from 0.0188 mg/L to 2.2816 mg/L. Biological assessment of water pollution and eutrophic condiction was conducted by using the method of \"indicator organism\"and \"biotic index\".The result indicates that the water quality is low-grade polluted.