Reconstruction of the history of a Thujopsis dolabrata var. hondai forest (I)

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  • ヒバ林の成立過程 (I)
  • ヒバ林の成立過程-1-撹乱の歴史
  • ヒバ リン ノ セイリツ カテイ 1 カクラン ノ レキシ
  • 撹乱の歴史
  • Disturbance history

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Abstract

The disturbance history of a hiba (Thujopsis dolabrata SIEB, et Zucc. var. hondai MAKINO) forest mixed with sugi (Cryptomeria japonica D. DON) and some deciduous broad-leaved species was investigated by annual ring chronologies. About 60 years ago, all sample trees of hiba and sugi showed synchronous increases in radial growths, and many of the broad-leaved trees were established. In addition to this, many trees also showed increases in growth about 160, 130, 90 and 35 years ago. According to these results, it became clear that some disturbances had produced canopy openings in the stand at these times. The disturbance which occurred 60 years ago is presumed to have been an intensive cutting of broad-leaved trees for charcoal making. This stand is regarded to have been formed under the influence of the intensive disturbance affecting a vast area which produced the synchronous rapid growth of advanced saplings of hiba in the undergrowth.

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