Recovering process and dynamics of the number of stems of maior tree species in a deciduous broadleaved forest in 40 years after a large-scale disturbance by a typhoon

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  • 風害後40年間の落葉広葉樹林の林分回復過程と主要樹種の幹数動態
  • フウガイ ゴ 40ネンカン ノ オチバ コウヨウジュリン ノ リンブン カイフク カテイ ト シュヨウジュシュ ノ カンスウ ドウタイ

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Stand recovering process and dynamics of the number of stems of major tree species in 40 years after a large-scale disturbance by a typhoon in 1954 were monitored in a permanent plot (0.25 ha) in a deciduous broadleaved stand. The basal area in 1994 was restored to up to 86 % of the estimated basal area before the disturbance, but tree species composition and DBH distribution in 1994 differed from those before the disturbance. Forty years is not considered to be sufficient to reconstruct stand structure and species composition. The number of tree species increased after the disturbance, however, the predominant tree species in 1994 were similar to those before the disturbance and they contributed significantly to stand recovery. Major tree species in 1994 were classified into 3 types, depending on their dynamics of the number of stems through and after the disturbance. It seemed to be a characteristic of stand recovery after a large-scale disturbance that tree species with various behaviors of seed germination and shade tolerance were put together in a given species group in the classification. Since vegetative regeneration, such as sprouting, is assumed to be important in this stand's recovery from the disturbance, regeneration behaviors other than seeding need to be taken into account as regeneration sources of tree species.

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