Biomass Distribution in 40-year-old Trees of Japanese Black Pine

概要

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Measurements were carried out to survey the quantity of above- and below-ground biomass and its distribution of five Japanese blackpines (Pinus thunbergii Parl.) growing on a sandy soil. The roots. divided into diameter groups. were surveyed using two nlethods-soil coring and excavation. Average dry weight of total biomass of the trees was 176, 185 g. Roots represented 13.2%, below-groundstump 6.5%, stem 70.4% and branches with needles 9.9% of total biomass. Roots made up about two thirds and stump one third ofbelow-ground biomass. Total length of below-ground biomass (except roots with diameter < 0.1cm) was 479.1 m/tree. Roots withdiameter of 0.1-0.2 cm represented only 0.7% of below-ground biomass, however as much as 49.9% of their total length. Roots withdiameter over 10.0 cm constituted as much as 21.6% of below-ground biomass, however were only 0.3% of its total length. Rootsystems had well developed tap roots to maximal depth of 231 cm. The results indicated that mass and length of roots with diameter 0.5-2.0 cm had a close correlation with branch mass. Mass and length of roots with diameter 2.0-10.0 cm closely correlatedto stem mass. Stem mass, root mass and root length closely correlated to DBH. A rather low correlation was found between DBHand mass of branches and below-ground stump. DBH was a suitable variable for predicting total biomass.
一般社団法人日本森林学会の論文
2000-08-16