| Co-Investigator(Kenkyū-buntansha) |
MATSUSHITA Koji KYOTO UNIV., FAC.OF AGRIC., ASSOCIATE PROFESSOR, 農学部, 助教授 (90199787)
ITOU Eiichi GIFU UNIV., FAC.OF AGRIC., RESEARCH ASSOCIATE, 農学部, 助手 (00176322)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥900,000 (Direct Cost: ¥900,000)
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| Research Abstract |
The following characteristics of tree cutting activity in Gifu Prefecture were revealed by analysis of tree-cutting reports generated between the fiscal years 1986 and 1991.
1.The distribution curves of cutting volume peaked at age-class VI (25-30 years) for Japanese cedar and Japanese cypress. This peak corresponded to thinning. The curves showed another increase at age-class IX (40-45 years) and over, corresponding to final cutting. However, as age-class of thinning is advancing higher and clear-cutting area is decreasing, it is difficult to distinguish between thinning and final cutting, and to grasp cutting area.
2.The average distance from the cutting site to the nearest forest road (the locality class) decreased throughout almost the entire period, for both Japanese cedar and Japanese cypress ; the distance in the fiscal year 1991 was approximately 230m for both species. However there were con-siderable differentials among municipalities in the locality classes. We can not connect the local-ity class with cutting-activity easily.
Therefore we analyzed the economical factors that determine cutting-activity. First, we grouped fifty-four mumicipalities in Gifu Prefecture into several types by 'factor analysis' and 'cluster analysis' with eleven factors related to forestry such as forest resource stock, infra-structural facilities, labor and groups, the industry of sawing logs, log price, and cutting volume, in each combination of two species and two methods of cutting tree. Next, cutting volume was analyzed by 'multiple regression analysis' with eleven factors to see if there is a correlation.
The results show that three factors, the industry of sawaing logs, labor and groups, and log price deterwine the cutting volume. This relationship was clearly observed in the Tono district and its outskirts. It may be conculuded that the quality of timber producing canter eventually deter-mine the cutting-activity.
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