Investigation of the factor that declines Charales and the restoration method for the conservation of lacustrine ecosystems

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For the conservation of Charales which is regarded to be most effective in water quality control, we developed the method to quantify the vegetated area and the biomass of submerged aquatic vegetation with a multi beam sonar. Based on the laboratory experiment using Chara braunii, we proved that herbicides, Atrazine more than 10^<-6> M and DCMU more than 10^<-8> M, affected the photosynthesis and algal growth. Using photographic interpretation and seeds analysis, we found that the lake without Charales at present used to be inhabited with several species of Chara and the transparency at the time with Chara was significantly higher than present.