Effects of defoliation caused by <I>Dendrolimus spectabilis</I> in their outbreak on the growth of matured <I>Pinus strobus</I> in Hokkaido

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  • 大発生時のマツカレハの食害が北海道のストローブマツ高齢木の成長に与える影響
  • ダイ ハッセイジ ノ マツカレハ ノ ショクガイ ガ ホッカイドウ ノ ストロ

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An outbreak of Dendrolimus spectabilis caused severe defoliation to age-68 Pinus strobus forest in 1985 in Hokkaido. In 1994, 6 trees were felled and the effects of the defoliation on growth of the trees were analyzed by stem analysis. Mean height growth per 5 years showed a tendency of decreasing from age-46 through 65, though the growth for the 5 years from age-66 through 70 was extremely small. The mean volume increment kept the level of about 0.1 m3 per 5 years from age-16 through 65, that of the period from age-66 through 70 was extremely small. The change of the annual increment showed a clear adverse effect of defoliation continued for 5 years. D. spectabilis seemed to begin increasing their population density at least 2 years before the outbreak year of 1985.

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