著者

万木 豊 永田 洋 Yurugi Yutaka Nagata Hiroshi

出版者

三重大学農学部

雑誌

三重大学農学部学術報告 (ISSN:04624408)

巻号頁・発行日

no.63, pp.p199-203, 1981-12

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この暖帯地方に分布する常緑広葉樹 4 種の長日条件と短日条件下での生長パターンをしらべ, その天然分布との関連を考察した。ヤマモモ・クスノキ, アラカンは長日条件, 短日条件下ともで周期的生長を示した。そこで, これら 3 樹種は亜熱帯地方では休眠に入ることなく, 分布可能なのであろう。タブノキは長日条件下で周期的生長を示すが, 短日条件下では 1 回のフラッシュをみたのみであった。このタブノキが亜熱帯地方に分布しているのは, 短日条件下でも周期的生長を示す生態型があるためであろう。Growth patterns of four evergreen broad-leaf trees distributed in this warm temperate zone on long-days and short-days were studied, and the relationship between growth patterns and distribution was discussed. Myrica rubra SIEB. Et ZUCC., Cinnamoum camphora SIEB., and Quercus glauca THUNB. showed periodic growth on long-days and even on short-days. So they can be distributed in the subtropical zone without being induced to bud dormancy. These three species seem to be induced to bud dormancy wit lowering temperatures in autumn, and to be released from bud dormancy with winter chilling in this region. Machilus thunbergii SIEB, et ZUCC. showed periodic growth on long-days, but showed only one flush and then no growth on short-days. It may be considered, therefore, that Machilus thunbergii can be distributed in the subtropical zone, having an ecotype showing periodic growth on short-days.