Abstract
Quantitative vegetation such as number of species, area and coverage of each species and ground level data were obtained from surveys with portable point positing GPS devices for 165 reed communities around Lake Biwa shore from 2008 to 2011 in order to discuss regional characteristics of environmental condition of reed communities for endangered botanical species. Main results are as follows; 1) 13 RDB species of environmental ministry and 25 RDB species of Shiga prefecture were obserbed. 2) Five RDB species (Pogostemon Stellatus, Persicaria hastatosagittata Nakai, Scutellaria dependens Maxim, Galium tokyoense, and Ludwigia epilobioides Maxim. subsp. greatrexii) were obserbed in the reed communities in Harie-region. 3) From examination of relationships between ground level and vertical width of reed communities and the number of endangered botanical species, there tended to be endangered species in the reed communities that had more than 45 cm of vertical width. 4) Reed communities of Harie, Enshouji, Ono, and Shiodu-hama provided favorable habitats for endangered species. Characteristics of environmental condition of them were shown.
