WEIGHING WHOLE TREE TRANSPIRATION RATE OF URBAN TREES AND ANALYSIS OF TREE'S MORPHO-PHYSIOLOGICAL EFFECTS

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  • 都市緑化樹木を対象とした大型重量計による単木蒸散量の計測と樹木の形態的・生理的特徴に基づく分析
  • トシ リョッカ ジュモク オ タイショウ ト シタ オオガタ ジュウリョウケイ ニ ヨル タンモク ジョウサンリョウ ノ ケイソク ト ジュモク ノ ケイタイテキ ・ セイリテキ トクチョウ ニ モトズク ブンセキ

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Abstract

 The purpose of this study is to grasp the variation of whole tree transpiration rates and capacities of container-grown isolated trees and to analyze tree's morpho-physiological effects. We developed hanging-type gravimeter and weighed 11 species (h=3~6.7 m). We found (1)Daily water use in summer irrigation days were 10~30 kg, equivalent to 0.62±0.36 times of water evaporation from the same size of crown projection area, (2)Maximum latent heat was 2.3 kW/tree, (3)Same tree's capacity can change threefold due to physiological change, (4)Ring-porous species tend to use much water, which suggest the significance of hydraulic capacity under volume-restricted soil condition.

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