オーストリアにおいて個人の森林所有者が活発に林業を行っている要因を明らかにした

2025-07-14 森林総合研究所

オーストリアの林家は、日本と比べて森林の所有面積が大きく、所有箇所も少ないため、1カ所あたりの面積が顕著に広い。若年層への早期の所有権移譲が進み、平均年齢が若く、自伐率が90%と高い。これにより丸太販売による林業収入も高く、経営意欲が維持されている。背景には、一子相続の慣習や森林法・土地取引法による細分化防止、年金制度による承継促進がある。対照的に、熊本県阿蘇の林家では、後継者不足や所有林の細分化が進み、収益性や持続性に課題がある。今後は、日本でも意欲ある所有者への集約制度や自伐支援の必要性が指摘される。

オーストリアにおいて個人の森林所有者が活発に林業を行っている要因を明らかにした
図1. 林業収入が2つの組合で異なる背景

<関連情報>

日本の家族林における林業の活性化と持続可能性に影響する要因-阿蘇とオーストリア・シュタイアーマルク州の比較から Factors Affecting Activeness and Sustainability on Forestry in the Family Forests in Japan—From the Comparison between Aso in Japan and Styria in Austria

Hirofumi Kuboyama,Nobuyuki Tsuzuki and Seira Eda
Forests  Published: 28 August 2024
DOI:https://doi.org/10.3390/f15091509

Abstract

Forestry in Japan and Austria share many similarities in their natural and social conditions. However, the Family Forest Owners (FFOs) in Japan seem not to be active and sustainable. To understand the factors affecting activeness and sustainability in family-owned forests in Japan, in 2021 and 2022, questionnaire surveys were done with members of Forest Owners’ Cooperatives (FOCs) in Aso, Japan, and Styria, Austria. Survey responses were comparatively analyzed via correlation analysis and binary logistic regression. Timber production was found to be more active in FOC Styria than in FOC Aso. One reason for this was the high-income dependence on forestry in Styria. Higher income was realized by self-harvest and the larger size of forest holdings and forest stands. The younger age of the members in FOC Styria, strongly affected by the pension system, leads to a higher self-harvest ratio. The culture of a sole child inheriting the family forest maintains the general size and scale of owned forests and stands in Styria. High distribution costs in FOC Aso reduced forestry income. As a result, sustainability was reduced in Aso because the availability of successors was low, and elderly forest owners who were once motivated by forestry tended to quit forestry.

 

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