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Leaf Temperature Characteristics being Affected by Light Regimes

광조건에 따른 식물의 엽온 특성

  • Park, Yong-Mok (Department of Life Science, College of Natural Science and Engineering, Cheongju University)
  • 박용목 (청주대학교 이공대학 생명과학과)
  • Received : 2011.09.06
  • Accepted : 2011.11.25
  • Published : 2011.12.31

Abstract

To evaluate heat environment surrounding plants diurnal change of leaf temperature in the broad-leaved deciduous and evergreen trees was measured with microclimatic environmental factors including global solar radiation, and upward and downward long wave radiation. Maximum daily solar radiation was 961.2 and 976.3 w/$m^2$ in August 9 and 23, respectively. Upward long wave radiation was slightly higher than downward long wave radiation, showing 404.2 w/$m^2$ in August 9 and 394.5 w/$m^2$ in August 23. In addition, daily maximum vapor pressure deficit was 5.42 and 6.84 kPa in August 9 and 23, respectively, indicating high evaporative demand. Quercus glauca and Acer mono was differently responded to changing light regimes. On August 9, leaf temperature at the top-positioned leaves of Acer plants was higher than air temperature as well as those of Quercus plants in the morning. This indicates that stomata in Acer plants were closed by heat stress or water stress in the morning, while Quercus plant maintained active transpiration by opening stomata. These results indicated that improved light regimes such as gap opening in the closed forest may not always affect positively in the physiology of understory plants.

Keywords

Forest gap;Global solar radiation;Leaf temperature;Long wave radiation;Transpiration

Acknowledgement

Supported by : 청주대학교 산업과학연구소

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