Extraction of Production Forests for Sustainable Forest Management Based on Economic Balances in Kanuma Area of Tochigi Prefecture(<Special Issue>Multipurpose Forest Management)

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This study developed the method to extract production forests based on economic balances with considering regeneration expenses for sustainable forest management. This study defined production forests as forests where expected revenues at clear cutting surpassed all costs such as harvesting and regeneration expenses. These revenues and costs were estimated based on forest registration and GIS data. The study site was Kanuma Area of Tochigi Prefecture. From the results of the double log prices their level from 1981, this model could relatively accurately estimate a variety of revenues and costs according to log prices. According to the result on the current conditions with considering regeneration costs, only 1.93% was extracted as production forest candidates. Thus, the implication is that conducting sustainable forest management at cutting age, 60 years is difficult based on the current conditions in this area other than 1.93% stands. This could be the reason why 94% of the forests are classified as those intended for water and soil conservation although Kanuma area is one of the famous forestry areas in Tochigi Prefecture. This situation occurred due to low log prices and high costs. All costs on smaller areas, subsequently volumes of subcompartments were much more expensive than log prices of even Hinoki cypress because all costs included indirect costs which were almost all fixed costs, the smaller the areas, subsequently the volumes, the higher the costs. Therefore, it will be necessary to decrease all costs considerably by extending forestry-operation sites while merging small subcompartments. Moreover, estimations that involved cutting ages set at 80, 100, and 120 years were conducted while considering long-term rotation management. However, the percentage of production-forest candidates increased a little because there was no change in the quality of logs, subsequently log prices. This study did not consider effects of changing log prices along with log quality and some kinds of subsidies. Developing the forest-road networks and extending forestry-operation sites through the merger of small subcompartments should be also examined. The next study will analyze these effects and which factors have the ability to decrease costs.
森林計画学会の論文

Extraction of Production Forests for Sustainable Forest Management Based on Economic Balances in Kanuma Area of Tochigi Prefecture(<Special Issue>Multipurpose Forest Management)

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