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Improvement of a Portable Soil Respiration Measuring System

  • 玉泉, 幸一郎
  • Gyokusen, Koichiro
  • 齋藤, 明
  • Saito, Akira
Publication Date
Mar 30, 1995
Kyushu University Institutional Repository (QIR)
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A open-flow system capable of regulating wind speed and CO_2 concentration was developed to measure soil respiration. The system consists of infrared gas analyzer (SBP-3 : SHIMAZU), air tank, CO_2 concentration regulator, air pump, flow meter and generator. The system is portable and could be used to measure soil respiration in the field. The effect of wind speed and CO_2 concentration on the measurement of soil respiration was investigated. Both of these parameters were found to be important factors in determining the soil respiration. The diurnal change in soil respiration in a thinned sugi stand was also studied. Soil respiration rate was high during daytime and low at night. However the deviation was only within 20% of the maximum value. The diurnal change of soil respiration was fitted well the multiple regression curve using soil surface temperature and C0_2 concentration as independent variables. Using the dsata of soil surface temperature and CO_2 concentration of air collected at the thinned stand, daily respiration rate of the stand was calculated as 22.1 g CO_2 m^{-2}day{-1}.

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