57-year changes in stand structure and growth for a mixed forest managed by selection cutting in central Hokkaido of northern Japan

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  • 北海道中部の北方針広混交林における択伐施業による林分構造と成長の57年間の変化
  • ホッカイドウ チュウブ ノ キタホウシンコウコンコウリン ニ オケル タクバツセギョウ ニ ヨル ハヤシ ブン コウゾウ ト セイチョウ ノ 57ネンカン ノ ヘンカ

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Abstract

<p>Changes in stand structure and growth of a mixed forest managed by selection cutting were analyzed based on long-term monitoring data (57-years) measured at three experimental plots (dominated respectively by broadleaved species, coniferous and broad-leaved species, and coniferous species) in Yubari city, central Hokkaido,northern Japan. As a result of selection cutting management, the tree mortality has decreased, the commercial timber value of the remaining trees has increased, and the growth of the stand volume has increased. However,it was found that in the plots dominated by broad-leaved species and by coniferous and broad-leaved species,tree density tended to decrease after each cutting. As a result, the stand type of these plots changed from a selection stand type to a single-layered stand type. In the conifer-dominated plot, it was predicted that the stand type could change from a selection stand type to a single-layered stand type, because of the increase in the broad-leaved tree density. These changes were mainly attributed to the suppression of tree regeneration induced by the thick growth of the Sasa senanensis dwarf bamboo. It was predicted that sustainable timber yields may not be secured in the future for any of the three plots. To continually conduct selection cutting management in stands where the forest floor is potentially covered by Sasa senanensis, it would be necessary to artificially promote tree regeneration in a cost-effective manner.</p>

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