Bud Break and Water Movement of Deciduous Broad-Leaved Trees

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  • Kondo Tamio
    Emeritus Professor, Kyushu University
  • Oga Shoji
    Research Institute of University Forests, Kyushu University

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Other Title
  • 落葉広葉樹の開芽と水移動
  • ラクヨウ コウヨウジュ ノ カイガ ト ミズ イドウ

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Description

Negative pressure is produced by loose transpiration observed on a dormant shoots. This pressure acts mainly as the driving force of water absorption from roots and water uptake in the trunk. Moreover, positive pressure of sap solute observed in winter promotes water movement, contributing to nutrient translocation necessary for flowering in Betula and Acer. The negative positive pressure cycle originating in the freezing-thawing cycle characteristic of Acer species in early spring facilitates water movement.

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