Temporal Occurrence of Dead Seedlings of Japanese Beech and Associated Fungi

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  • ブナ枯死実生の発生経過とそれに関連する菌類
  • ブナ枯死実生の発生経過とそれに関連する菌類〔英文〕
  • ブナ コシ ミショウ ノ ハッセイ ケイカ ト ソレニ カンレンスル キンルイ

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Abstract

To obtain the basic knowledge of the early phase of the regeneration process of Japanese beech (Fagus crenata BLUME) forests, the temporal occurrence of dead seedlings and its possible causes were investigated in nine quadrats in two experimental forests. Deaths of the current-year seedlings occurred mainly from the end of May to the end of July and after that no prominent change in mortality was detected. One-year-old seedlings decreased gradually in number through the growing season and no specific pattern of mortality was observed. Mortality of the current-year seedlings increased with decreasing relative light illuminance in the stands, suggesting that light conditions are one of the important factors associated with the disappearance of the seedlings. Dead seedlings were categorized mainly into four types in current-year seedlings and three types in one-year-old ones. The periods of occurrences for the four types observed in the current-year dead seedlings were clearly different depending on the type, and herbivory and damping-off caused by fungal pathogens played important roles in seedling deaths. On one-year-old seedlings, damage of winter buds or unfolding of leaves by insects seemed to be the important factors in the deaths of seedlings. From the diseased hypocotyls of the damped-off current-year seedlings, Colletotrichum dematium (Pees. ex FR.) GROVE was isolated frequently and inoculation tests showed that this fungus was pathogenic to current-year seedlings, suggesting that this fungus might play an important role in the disappearances of the seedlings.

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