Responses Of Attached Algae Colonization And Succession To Ammonia Nitrogen Supply Of Lake Taihu

In order to recognize community succession rules of attached algae in the eutrophic water body, using macroscope Counting method and Field sampling study the responses of attached algae on Taihu Lake submerged macrophyte Vallisneria natans, Potamogeton crispus and inert Stroma to ammonia nitrogen(AN) supply by static incubation test to investigate the relationship with the nutrient salt. And the relationships of the Colonization succession to the attached algae with attached stromas in differenr consistency of the ammonia nitrogen are studied. Simultaneously, the disciplines of the Colonization succession to the attached algae with different season are also researched.The responses of attached algae on submerged macrophytes and inert Stroma to ammonia nitrogen(AN) supply by static incubation test show that Frailaria of Bacillariophyta, Melosira, Cymbella, Navicula; Chroococcus of Cyanophyta is dominant species at the collected sample,it evolved into Navicula,Frailaria is dominant species at low AN level and Stigeoclonium of Chlorophyta; Cyclotella,Navicula of Bacillariophyta at high level AN when it be laid into glass cylinder of tested group of different AN level,biomass is positively correlated to low AN level (≤2.5mg/l).Showing A N level is important to attached algae.In same level of AN, the different stromas have no Significant influence on the most of the algae,but the different stromas influence the attached speed of the algae, the attached speed on the smooth surface is slower than on the pulled surface. The abundance ratio of the Stigeoclonium Chlorophyta on the slide is larger than on the Potamogeton crispus.The Stigeoclonium becomes the most abundant one on the slide, but it’s hard for Stigeoclonium to be the dominant species on the Potamogeton crispus. And the biomass per unit area on the slide is higher than the Potamogeton crispus.The community structure of the attached algae on submerged plant in Kornhill Bay Taihu Lake does not have much difference, but it is different in Ankistrodesmus Chlorophyta, Navicula Gomphonema Chrysophytax; in August, the dominant species are Navicula, Cymbellaceae, Melosira, Fragilaria of Bacillariophyta and Chroococcoid of Cyanophyta.By analyzing the AN with indoor test, the change of community structure of the attached algae is closely related to the AN in water and the seasons.