Abstract: The characteristics of macrozoobenthos and environmental factors in water and sediment in Baiyangdian Lake were investigated in 2018. The relationship between community structure of macrozoobenthos and environmental factors were analyzed. Results showed that macrozoobenthos consisted of 6 classes and 21 species in Baiyangdian Lake, with Gastropoda and Insecta being the dominant classes. The mean biomass and abundance had temporal and spatial variations. The mean biomass of macrozoobenthos peaked in summer, while the mean abundance of macrozoobenthos peaked in spring. The maximum of mean biomass was found in Nanliuzhuang site, while the maximum of mean abundance was found in Dongtianzhuang site. Quantified by the diversity index, water quality of Baiyangdian Lake was at a low level. Nitrogen and phosphorus contents in water and carbon and nitrogen in sediment were relatively high. NO₃^--N, TN, temperature and TOC in water and NO₃^--N, pH and NH₄⁺-N in sediment were the main environmental factors influencing macrozoobenthos. Our results could provide a basis for restoration and management of macrozoobenthos in Baiyangdian Lake.

Key words: macrozoobenthos, water environmental factor, sediment environmental factor, redundancyanalysis.