Effect of weeding frequency, slope aspect and initial tree density on the mortality and accidental cutting of planted Sugi (<i>Cryptomeria Japonica</i>) trees.

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  • 下刈り回数，斜面方位および植栽密度の違いがスギ植栽木の枯死および誤伐に与える影響
  • 下刈り回数,斜面方位および植栽密度の違いがスギ植栽木の枯死および誤伐に与える影響 : 鹿児島大学附属高隈演習林を事例として
  • シタガリ カイスウ,シャメン ホウイ オヨビ ショクサイミツド ノ チガイ ガ スギショクサイモク ノ コシ オヨビ ゴバツ ニ アタエル エイキョウ : カゴシマ ダイガク フゾク コウクマ エンシュウリン オ ジレイ ト シテ
  • －鹿児島大学附属高隈演習林を事例として－
  • A case study in the Kagoshima University Research Forest, southwestern Japan.

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Abstract

<p>This study investigated the effects of weeding frequency, slope aspect and initial tree density on the mortality and accidental cutting of planted Sugi (Cryptomeria japonica) in southern Kyushu. To predict the probability of mortality and accidental cutting,we used the multinomial logistic regression model using weeding frequency,slope aspect and initial tree density. The highest mortality on north- and south-facing slopes was found in non weeding plot (33.3%) and every-year weeding plot (16.9%), respectively. Accidental cutting of planted Sugi was found in 3 or 4 times weeding plots. Multinomial logistic regression model showed that mortality was affected by slope aspect and initial tree density. Mortality decreased with the increase of weeding frequency on northfacing slope, while mortality was invariable regardless of weeding frequency on south-facing slope. Accidental cutting rate was invariables regardless of weeding frequency on both slopes. The mortality rate and accidental cutting rate under the 1,500 trees/ha density was higher than that under the 3,000 trees/ha. These results suggest that weeding frequency should be determined according to slope aspect and initial tree density.</p>

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