黒ボク畑地におけるCO_2フラックスの動態と熱赤外放射測温による土壌面温度との関係 Relationship between Dynamic Change of CO_2 Flux over Andisol Upland Field and Remotely Sensed Surface Temperature

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This study investigated the potential of thermal remote sensing for estimating ecosystem surface CO<sub>2</sub> flux. Ecosystem surface CO<sub>2</sub> flux was measured by the eddy covariance method for more than three years, in conjunction with thermal and optical remote sensing measurements as well as micrometeorological, soil, and plant measurements. The soil was Andisol (Hydric Hapludands), a humic volcanic ash soil, which is the major cultivated soil for upland crops in Japan. The soil surface CO<sub>2</sub> flux under bare soil conditions was best correlated with the remotely sensed surface temperature, while air temperature was less well correlated and soil temperature and soil water content were poorly correlated. The relationship was well expressed by an exponential <i>Q</i><sub>10</sub> function (<i>r</i><sup>2</sup>=0.70, RMSE=0.095). The value of <i>Q</i><sub>10</sub> and the threshold temperature at which the CO<sub>2</sub> flux approached zero were estimated to be 1.31 and 10.0°C, respectively. Results suggested that the soil surface temperature had the dominant effect on the microbial respiration as well as on the physical processes determining the CO<sub>2</sub> gas transfer at the soil-atmosphere interface. Remotely sensed surface temperature will provide useful information for investigation of CO<sub>2</sub> transfer processes near the soil surface, as well as for quantitative assessment of ecosystem surface CO<sub>2</sub> flux.

収録刊行物

  • 農業気象

    農業気象 60(1), 33-41, 2004-03-10

    養賢堂

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各種コード

  • NII論文ID(NAID)
    10012702392
  • 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
    6895581
  • 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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