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A STUDY ON THE RELATIONSHIP BETWEEN ALGAL COMMUNITY AND TROPHIC LEVEL FOUR IN LAKE SIHAI, BEIJING Using periphyton assemblages to assess stream conditions of Taizi River Basin, China Evaluation of relationship between environmental factors and diatom assemblages at genus and species levels in the Taizi River Basin, China Community characteristics of aquatic insects and bioassessment for water quality in lower order streams in Liangshui and Maoershan watersheds,Heilongjiang,China USE OF MODEL GRASSY POND OF ECOSYSTEM TO EVALUATE THE HOLISTICALLY ECOLOGICAL EFFECTS OF CHEMICAL STRESS