Investigation and Biological Assessment of Zoobenthos Community in Daqing Reservoir
XIAO Hong,LI Zhong-wei, BAO Jun, XIAO Rong-xin (Daqing Environmental Monitoring Central Station, Daqing 163316, China)
During 2001 -2005, the biological investigation of zoobenthos was conducted in Daqing reservoir. In total, 4 families 7 genera of zoobenthos were observed, of which, 1 family 1 genus was mollusca, 1 family 2 genera were annelidan, 1 family 3 genera were aquatic insect, 1 family 1 genus was crustacean. The density of zoobenthos ranged from 96 ~ 880 ind. /m2 . The dominant genera were Procladicus genus and Chironomus genus. The water quality of Daqing reservoir was assessed by using BPI i. e. Biology Pollution Index. The results showed that BPI value ranged from 0. 73 ~ 0. 82, the water quality of Daqing reservoir belonged to theβ- type of moderately polluted type, the polluted water level was not obviously different during 5 years, and the water quality of Daqing reservoir turned for the better slightly. In mean-flow period, the water quality was a bit better than that in high-flow period.