Dead forms and mortality factors of woody plants in a mixed forest of Cryptomeria japonica var. radicans Nakai and Fagus crenata Blume

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  • アシウスギーブナ混交林における樹木の枯死形態と枯死要因
  • アシウスギ ブナ コンコウリン ニ オケル ジュモク ノ コシ ケイタイ ト

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Dead forms and mortality factors of woody plants were studied in a 16 ha study plot established in a natural forest of the Mondori Dani Watershed (35°20'N, 135°44'E, 688.7-836.5 m elevation), Kyoto University Forest in Ashiu. We investigated 2, 472 dead trees over 10 cm in DBH in the plot and 25 species were identified. Cryptomeria japonica var. radicans was most dominant and made up 71% of dead trees. Fagus crenata and Quercus crispula followed. Diameter distribution of dead trees varied among species. C. japonica var. radicans showed L-shaped DBH distribution but F. crenata and Q. crispula showed unimodal distributions. Dominant dead forms of C. japonica var. radicans were uprooting and standing dead. Wind and snow damages were estimated to be major mortality factors but damage by Japanese black bear (Selenarctos thibetanus japonica) was also supposed to be an important causes of death for C. japonica var. radicans. Standing dead was most frequent in F. crenata and the infection of fungi supposed to play an important role to death. Q. crispula was more likely to be uprooted by wind or snow.

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