Allometry and the Root Structure of Chosenia arbutifolia, Toisusu urbaniana, and Populus maximowiczii Saplings.

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  • Honma M.
    Graduate School of Agriculture, Hokkaido University
  • Yajima T.
    Graduate School of Agriculture, Hokkaido University
  • Kikuchi S.
    Graduate School of Agriculture, Hokkaido University

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Other Title
  • ケショウヤナギ•オオバヤナギ•ドロノキ稚樹の器官量配分と地下部形態
  • ケショウヤナギ・オオバヤナギ・ドロノキ稚樹の器官量配分と地下部形態
  • ケショウヤナギ オオバヤナギ ドロノキチジュ ノ キカンリョウ ハイブン ト チカブ ケイタイ

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We compared the allometry and the root structure of C. arbutifoli seedlings, with T. urubabiana and P. maxirnowiczii, which all grow on the same gravelly bars along the Satsunai and Rekifune rivers, in Hokkaido, Japan. The surface soils at the study sites were composed mainly of cobbles and boulders over 10 cm in particle-size, which accounted for 80% of the sediment weight. The seedlings of the three species had clear taproots, with very few lateral roots. The root depths increased repidly with increasing tree heights. The total thick root length and the total thin root length of the three species increased remarkably, after the trees reached over 40 cm in height. The T/R ratio decreased as the trees grew. The allometries between the total aboveground and underground mass showed no significant differences between these species. The root elongation and dispersal patterns in the early stages of establishment were similar among the three species. These patterns could be effective characteristics for the establishment and growth of seedlings on gravelly bars.

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