Leaf Temperature in Relation to Meteorological Factors

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  • HASEBA Tetsuya
    Division of Agricultural Meteorology, College of Agriculture, Ehime University
  • ITO Daijiro
    Division of Agricultural Meteorology, College of Agriculture, Ehime University

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Other Title
  • 植物の葉温と気象要素との関係
  • 植物の葉温と気象要素との関係 (2) : 気温・湿度の変化に伴う葉温の変化
  • ショクブツ ノ ヨウオン ト キショウ ヨウソ ト ノ カンケイ 2 キオン
  • (2) Leaf Temperature Variation with Air Temperature and Humidity
  • (2) 気温・湿度の変化に伴う葉温の変化

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Description

The plant-leaf temperature is calculated as air temperature and/or relative humidity varies after solving the stationary heat budget equation of a single leaf. Stomatal aperture changes are assumed to be dependent on short-wave radiation and air temperature when the air temperature varies, and on relative humidity in addition to the former two factors when relative humidity varies. Because the convection coefficients for heat and water vapor transfer through the boundary layer on a leaf are corrected by buoyancy, the leaf temperature is more accurately estimated at low wind speeds. Moreover, the coefficients include the effects of temperature distribution over the leaf surface, turbulence of the air flow within a plant canopy and leaf fluttering.<br>There is a certain point at which leaf and air temperatures are equal. Below that point, the leaf temperature is always higher than the air temperature, while above that point the reverse is true even though both temperatures continue to rise. This so called equality temperature depends on meteorological factors. In addition, it is suggested that the equality temperature depends, in part, on the plant species.<br>Leaf temperature increases with increasing relative humidity when the stomatal aperture remains fixed. When the aperture depends on the relative humidity, the leaf temperature variation is affected by the stomatal behavior.

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