4 . the community structure and standing crops of periphyton in chinese reservoir were first reported . thirty - five genra of periphytic algae were collected using hanging plastic slices 8 .青梢帕culter由bryi鳞片的年轮从4月份开始形成，大部分年轮形成时间在7月。
2.
The water quality state was evaluated with shannon - weaver index and some indicators of periphyton , and results showed that the nutrient type of daoguanhe rerservoir was mesotrophic type , and it had a tendency to develop to the eutrophic type 11 .依据周丛藻类多样性指数及周丛生物某些指示种类评价该水库水质状态，判定为中营养型，并有向富营养级演化的趋势。
