1991 Fiscal Year Final Research Report Summary

Studies on the Bio-resources of Deciduous Broad-leaved Forests

Research Project

Project/Area Number	02660155
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	林学
Research Institution	Gifu University
Principal Investigator	KOMYAMA Akira Fac. Agric., Gifu Univ., Assoc. Prof., 農学部, 助教授 (60135184)
Co-Investigator(Kenkyū-buntansha)	NINOMIYA Ikuo Fac. Agric., Ehime Univ., Assoc. Prof., 農学部, 助教授 (80172732) HIGO Mutuki Fac. Agric., Gifu Univ., Assistant, 農学部, 助手 (80198994) TANAHASI Mituhiko Fac. Agric., Gifu Univ., Assoc. Prof., 農学部, 助教授 (80093269)
Project Period (FY)	1990 – 1991
Keywords	Broad-leaved forest / Biomass / Bio-resource management / Net production / Allometry
Research Abstract	1. Allometric relationships of deciduous broad-leaved species The allometric relationships were determined respectively for stem, branch, leaf, and fruit. As for the stem, the allometric relationship showed no separation by tree species. Therefore, this relationship was considered to hold good in various kind of the forests. Slight separations were observed in the relationships of the branch and the leaf. This related to the species tendency of shade-tolerance. 2. Growth characteristics of deciduous broad-leaved tree species The growth process of each tree species was studies by the tree-ring analysis. The tree species studied were separated in the two characteristics with. growth. One was sun tree, of which growth rate wag high in earlier stage since germination, but the growth was stopped in mature stage. Another was shade trees, which continued lower growth rate through all life stages. Using the M-w diagram, the changing patterns of stratification of the forest was analyzed. It was concluded that the species composition of forest was changing with time because of the difference of species growth characteristics. 3. Disposal of hardwoods by high temperature and high pressure The stem of Betula species was placed under high temperature and high pressure to mold into rectangular wood shape. The results were quite successful. This results suggested that the so-called "unuseful tree species" can be shifted to be commercial timbers using this disposal.