The effects of ring barking of trees on the within-stand light conditions and sapling composition in an unthinned plantation of young Sugi (Cryptomeria japonica) in Iwate Prefecture, northern Japan

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  • 巻き枯らし間伐がスギ若齢人工林の林内光環境と林床木本組成に及ぼす影響 : 岩手県における事例
  • マキ カラシ カンバツ ガ スギ ジャクレイ ジンコウリン ノ ハヤシ ナイコウ カンキョウ ト リンショウ キモト ソセイ ニ オヨボス エイキョウ : イワテケン ニ オケル ジレイ

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Abstract

The 5-year changes in the relative photon flux density (rPFD) 1.3 m above the ground and the covers and abundance of ground vegetation were monitored in two blocks with ring barking of stems and one block without. The rPFD and cover and abundance of ground vegetation increased in the two treatment blocks with ring barking of the stems corresponding to 31-39% of stand volume during the 5-year period. Nevertheless, the increase in these variables in the treatment blocks did not clearly differ from that in the control block. It appears that 5.6% of the maximum rPFD in the treatment blocks was too low to maintain luxuriant ground vegetation. Barking treatment with an intensity of 50% or more of stand volume is probably needed to improve the within-stand light conditions and to maintain luxuriant ground vegetation in unthinned plantations of young Sugi (Cryptomeria japonica).

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