ダイズ群落における蒸散, 蒸発散と日射強度および分光反射特性の関係 : リモートセンシングと日射法に基づいた群落蒸散の簡易評価について Relationship of Transpiration and Evapotranspiration to Solar Radiation and Spectral Reflectance in Soybean Canopies : A Simple Method for Remote Sensing of Canopy Transpiration

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The study investigated diurnal and seasonal dynamics of evapotranspiration (ET) and transpiration (Tr) in a soybean canopy, as well as the relationships among ET, Tr, solar radiation and remotely sensed spectral reflectance. The eddy covariance method (ECM) and stem heat balance method (SHBM) were used for independent measurement of ET and Tr, respectively. Micrometeorological, soil, and spectral reflectance data were acquired for the entire growing season. The in-stantaneous values of canopy-Tr estimated by SHBM and ET by ECM were well synchronized with each other, and both were strongly affected by the solar radiation. The daily values canopy-Tr increased rapidly with increasing leaf area index (LAI), and got closer to the ET even at a low value of LAI such as 1.5—2. The daily values of ET were moderately correlated with global solar radiation (Rs), and more closely with the potential evapotranspiration (ETp) estimated by the "radiation method." This fact supported the effectiveness of the simple radiation method in estimation of evapotranspiration. The ratio of Tr/ET as well as the ratio of ground heat flux (G) to Rs (G/Rs) was closely related to LAI, and LAI was a key variable in determining the energy partitioning to soil and vegetation. It was clearly shown that a remotely sensed vegetation index such as SAVI (soil adjusted vegetation index) was effective for estimating LAI, and further useful for directly estimating energy partitioning to soil and vegetation. The G and Tr/ET were both well estimated by the vegetation index. It was concluded that the combination of a simple radiation method with remotely sensed information can provide useful information on energy partitioning and Tr/ET in vegetation canopies.

収録刊行物

  • 農業気象

    農業気象 60(1), 43-53, 2004-03-10

    養賢堂

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各種コード

  • NII論文ID(NAID)
    10012702431
  • NII書誌ID(NCID)
    AN00200732
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00218588
  • NDL 記事登録ID
    6895592
  • NDL 雑誌分類
    ZR7(科学技術--農林水産--農産)
  • NDL 請求記号
    Z18-388
  • データ提供元
    CJP書誌  NDL  IR  J-STAGE 
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