Spatial variations in evapotranspiration over East Asian forest sites. II. Surface conductance and aerodynamic conductance

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    • Khatun Rehana
    • Graduate School of Bioagricultural Sciences, Nagoya University
    • Takagi Kentaro
    • Field Science Center for Northern Biosphere, Hokkaido University
    • Wang Huimin
    • Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences
    • Ohta Takeshi
    • Graduate School of Bioagricultural Sciences, Nagoya University
    • Kotani Ayumi
    • Graduate School of Bioagricultural Sciences, Nagoya University
    • Asanuma Jun
    • Terrestrial Environment Research Center, Tsukuba University
    • Gamo Minoru
    • National Institute of Advanced Industrial Science and Technology
    • Han Shijie
    • Institute of Applied Ecology, Chinese Academy of Sciences


Evapotranspiration over forest surfaces is mainly constrained by environmental and forest structural components through their influence on surface conductance (<i>G<sub>s</sub></i>) and aerodynamic conductance (<i>G<sub>a</sub></i>). Tower based eddy covariance data from 16 forest sites in East Asia (2°S to 64°N) were used to examine the sensitivity of Matsumoto and Nakai models for predicting <i>G<sub>s</sub></i> and <i>G<sub>a</sub></i>, respectively. Daytime dry-canopy data for the growing season were used in this study. Comparisons between model predictions and observed <i>G<sub>s</sub></i> and <i>G<sub>a</sub></i> showed good agreement, suggesting that the models were suitable for predicting <i>G<sub>s</sub></i> and <i>G<sub>a</sub></i> with reasonable accuracy. However, the model for <i>G<sub>s</sub></i> was unable to predict <i>G<sub>s</sub></i> accurately when soil water content was low (∼10%). In this circumstance, effective soil water content and a more comprehensive method for modelling the soil water content function must be used. <i>G<sub>s</sub></i> in East Asia was largely depended on vapour pressure deficit and secondarily on soil water content. <i>G<sub>a</sub></i> was largely affected by leaf area index compared with stand density.<br>


  • Hydrological Research Letters

    Hydrological Research Letters 5, 88-92, 2011

    Japan Society of Hydrology and Water Resources (JSHWR) / Japanese Association of Groundwater Hydrology (JAGH) / Japanese Association of Hydrological Sciences (JAHS) / Japanese Society of Physical Hydrology (JSPH)


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