Ikari et al. (2026) は、100年以上にわたって人為的な管理下にある半自然草原(古草原)の分布を地図化しました(図2)。この研究では、長期にわたる人為的管理によって森林への遷移が抑止されてきた、冠水しない草本植物優占の植生を半自然草原と定義しています。こうした古草原の残存面積は、合計で60,000ヘクタール未満であることが判明しました。
Arizono S.(1995). 1.2 Land Use in Japan circa 1850 (pp.4-5), 1.3 Land Use in Japan circa 1900 (pp.6-7), Nishikawa O., Himiyama Y. et al. eds., Atlas - Environmental Change in Modern Japan (in Japanese), Asakura Publishing Co., Ltd.
Himiyama Y.(1995). 1.4 Land Use in Japan circa 1950 (pp.8-9), 1.5 Land Use in Japan circa 1985 (pp.10-11), 1.6 Land Use in Japan circa 1900-1985 (pp.12-13), Nishikawa O., Himiyama Y. et al. eds., Atlas - Environmental Change in Modern Japan (in Japanese), Asakura Publishing Co., Ltd.
Ikari, S., M. Tomitaka, Y. Kubota, and T. Kenta. (2026). Geospatial Data Layer of Semi-Natural Grasslands With Century-Old or Longer Temporal Continuity. Ecological Research 41, no. 4: e70108. https://doi.org/10.1111/1440-1703.70108.
Japanese Ministry of Land, Infrastructure, Transport and Tourism Land area by land use category https://www.mlit.go.jp/kokudoseisaku/kokudoseisaku_fr3_000033.html
Japanese Ministry of Environment Vegetation Naturalness Survey/Vegetation Survey (Accessed 2026/03/29) https://www.biodic.go.jp/english/kiso/vg/vg_kiso_e.html
Japanese Ministry of Agriculture, Forestry and Fisheries Crop Statistics Survey (Accessed 2026/03/29) https://www.maff.go.jp/j/tokei/kouhyou/sakumotu/menseki/
Japanese Ministry of Agriculture, Forestry and Fisheries Current Status of Public Pastures and Grazing (Accessed 2026/03/29) https://www.maff.go.jp/j/chikusan/sinko/lin/l_siryo/attach/pdf/index-1465.pdf
Ogura, J. (2006). The transition of grassland area in Japan Journal of Kyoto Seika University, 30, 160–172.
Inoue, T., Okamoto, T., & Kenta, T. (2021) Qualitative and quantitative analyses of changes in the grassland area in the Sugadaira Highlands, central Japan: A case study of grassland decline in a national park Japanese Journal of Conservation Ecology 26 : 219-228 https://doi.org/10.18960/hozen.2041
Tomitaka, M., Ikari, S., Seki, T., Inoue, T., Kawai, J., Yamamoto, Y., Miyamoto, N., Yoshizawa, A., Kaneko, F., Kubota, Y., and Kenta, T. (2025) Extinction risk status by habitat type: Insights from Japan’s Red Lists (1997–2025) and changes in habitat area Preprint https://doi.org/10.51094/jxiv.835
Ushimaru, A., Uchida, K., Ikegami, M., & Suka, T. (2020). Grasslands and shrublands of Japan. Encyclopedia of the world's biomes, 785-799.
本ページを引用
数字と図表の引用: Ikari, S. (2026). Basic statistics of seminatural and other types of grasslands in Japan. Japanese Old Grassland Watch by Think Nature Inc. https://doi.org/10.5281/zenodo.19758435
草原可視化方法論の引用: Ikari, S., M. Tomitaka, Y. Kubota, and T. Kenta. (2026). Geospatial Data Layer of Semi-Natural Grasslands With Century-Old or Longer Temporal Continuity. Ecological Research 41, no. 4: e70108. https://doi.org/10.1111/1440-1703.70108.