Comparison of local forestry operations in the Higashimikawa Forest Planning Area of Aichi Prefecture

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  • 愛知県東三河計画区における森林施業の実施状況の地域比較

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Abstract

We compared the forestry operations, location, and topography of four local authority management areas in the Higashimikawa Forest Planning Area, Japan. The target road density was calculated for each local authority area by considering the public, forest, and strip roads and five basic forestry operations conducted from 1991 to 2000. Forestry operations generally decreased over the study period, especially in the upper-stream area. The mean access distance to worksites, which affected forestry operations more than did topography, was greatest in the mid-stream area, followed in order by the upper- and lower-stream areas. In 1997, the worksite access distance in the upper-stream area began to decrease dramatically as the price of domestic timber declined, while the difference between the mean entire-forest access distance and the mean local worksite access distance tended to increase. In the mid-stream area, the mean worksite access distance generally held steady, whereas the difference between the average entire-forest and local worksite access distances tended to decrease because of new road construction. In the lower-stream area, the mean worksite access distance also tended to decrease, although the difference between the mean entire-forest access distance and mean local worksite access distance was the smallest among the areas studied. The mid-stream area had the lowest target road density, followed by the upper- and lower-stream areas. Road improvements in the upper- and mid-stream areas are needed to improve forest management efficiency. In the lower-stream area, where the road network is already sufficient, extension activity to improve forest management is more important.

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