The Analysis of Profit on Group Thinning Using Different Yarder Machines

Abstract

Using the forestry information system which includes the geographic information system (G.I.S.) technology, the differences in profit with the thinning method were compared. Spur road establishment costs and thinning profits were also taken into consideration. The thinning area of the 47th territorial joint forest management at the Kuma Village in Kumamoto Prefecture in the 1990 fiscal year was studied. Thinning was carried out within a 100-meter range on either side of the spur road. A higher profit was obtained by group thinning than by individual thinning. The profit was higher with the mobile yarder than with the standard yarder. It was also noted that the spur road establishment enterprise costs were higher than the profit on thinning. Therefore, some financial support is necessary for the spur road establishment.