抄録
Most of reed communities around Lake Biwa are still under difficult conditions to grow without propermaintenance. Various studies have been conducted on the reed communities, but a few studies targeted the relationbetween geological conditions and reed growth. The objective of this paper is to evaluate the influence factors on reedgrowth. Reed communities around Lake Biwa were investigated on August 2001 and the following results were drawn: 1) Average density of reed shoots was 52 shoots/m2, average reed height was 201cm, average diameter of reeds was6.0mm on Lake Biwa shore. 2) Average density of reed shoots was high on the groundbetween higher than -70cm andlower than -30cm of the Lake Biwa standard water level (B. S. L.). On the ground lower than B. S. L.-100cm and higherthan -30cm, average density of reed shoots was low. 3) Organic matter contents in soil on natural reed communities werelower than ones of reed plantation fields. 4) Analysis of variance between reed growth indices and geological indicesshowed that a coefficient of uniformity and contents of total phosphorus in soil on reed community have an influence onthe reed growth.
