Construction of a yield–density diagram using stem weight for a Japanese cedar plantation in Yamagata University forest, and biomass dynamics simulation

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  • 山形大学上名川演習林のスギ人工林における重量値による収量–密度図の構築とバイオマス動態シミュレーション
  • ヤマガタ ダイガク ジョウメイガワ エンシュウリン ノ スギ ジンコウリン ニ オケル ジュウリョウチ ニ ヨル シュウリョウ-ミツドズ ノ コウチク ト バイオマス ドウタイ シミュレーション

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Abstract

The number of artificial plantations where appropriate forest management is not conducted is increasing owing to decreased domestic lumber demand. As a result, such plantations are facing severe forest health and sustainability problems. In addition to their wood production and ecosystem maintenance functions, the carbon fixation function of forests is also receiving attention because it limits global warming. In this study, a yield–density diagram using stem weight was constructed for cedar plantations in Yamagata University forest. Using this diagram, we simulated the effects of different thinning rates on biomass dynamics. The simulation showed that increasing the thinning rate of all forest layers from 20 % to 40 % resulted in an increasing trend of large-diameter trees in the future at all forest ages. In contrast, the total amount of biomass per forest stand, in accordance with the decreasing number of trees at higher thinning rates, was less than that of the current 100-year forest stand. The yield–density diagram that was constructed in this study can be used as a tool for new forest management and biomass evaluations that focus on carbon fixation by forests. To further increase the accuracy of the biomass dynamics simulation, a more accurate understanding of biomass growth is needed.

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