滋賀県日野町にある63年生コウヤマキ人工林の物質生産

概要

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Biomass, litterfall and net production of a 63-year-old plantation of S. verticillata were invesitigated at the down hill side of Mt. Watamuki-yama in Shiga Prefecture. Six sample trees were felled and weighed after the stratified clip technique. The values per hectare were estimated by means of allometric relations between D^2H and the amount of each part of a tree. The leaf biomass (34.0 t/ha in ovendry wt.) was one of the largest amount among various other forests in Japan, which might be due to the lasting leaf longevity and the large live crown length. Biomass density (1.85 kg/dm^3) was also large in comparison with the values of various forests in Japan. The leaffall began in May, and as time goes on, the amount of leaffall increased recording the maximum value from August to September, then decreased to the end of the growing season. The seasonal fluctuation of leaffall seems to have a close relation to the temperature increase or development of new leaves. Such a pattern has not yet found in the evergreen forests in Japan except young dense stands.
1981-09-30