Changes in Biomass of Understory with Silvicultural Operations in Abies sachalinensis.

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  • Utsugi H.
    Hokkaido Research Center, Forestry and Forest Products Research Institute
  • Iida S.
    Hokkaido Research Center, Forestry and Forest Products Research Institute
  • Abe S.
    Forestry and Forest Products Research Institute
  • Tanouchi H.
    Forestry and Forest Products Research Institute

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  • 人工林施業に伴うトドマツ人工林内下層植生現存量の変化
  • ジンコウリン シギョウ ニ トモナウ トドマツ ジンコウリンナイ カソウ ショクセイ ゲンソンリョウ ノ ヘンカ

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Abstract

The understory biomass (height<3 m; tree, vine and herbaceous species) in 21 plantation stands of Abies sachalinensis was investigated to understand how that biomass changes with forest age and with environmental gradient in the forest canopy. The mean tree height was 9∼24 m, and the mean stand density of canopy trees was 350∼2,275 trees ha–1. Forest stand age was in the range of 25∼80 years, and time since the last silvicultural treatment was in the range of 4∼48 years. The relative light intensity under the canopy (indirect site factor; ISF) was 5.3∼22.3%. ISF could be estimated using an empirical regression model with one parameter: the reciprocal of stand density (Dsi). The understory biomass was 0.01∼4.3 Mg ha–1, and the maximal leaf area index (LAI) was 3.37 m2 m–2. The variations in understory biomass in this research were explained by the value of ISF, Dsi and the time since the last silvicultural treatment. The understory biomass at ISF below 20% was found not to exceed 7 Mg ha–1, which is consistent with previous reports in Japan. This biomass value is only several percent of that for canopy trees in old coniferous plantations. Even so, it is thought that the understory biomass is important for soil and water conservation in forests in Japan.

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