バッファーチャンバー方式ガス収支測定法の検証と装置の設計指針

日本作物学会紀事

小田 正人¹ 

[1] 国際農林水産業研究センター

关键词: Chamber Method;    チャンバー法;    Photosynthesis and transpiration;    光合成蒸散;    Soil respiration;    土壌呼吸;   

DOI  :  10.1626/jcs.81.309

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The buffered chamber method is a kind of closed chamber method for gas-balance measurement. The closed chamber is divided into a measurement and a buffer chamber in this method. The gas is circulated between both chambers and the gas-concentration change is measured in the buffer chamber. The measurement time can be adjusted to the gas-sensor response time or gas-change speed of the measured object. Therefore, this method can be used for accurate and widespread measurements. However, this method has a response lag between the buffer and the measurement chambers. Hence, the response lag was analyzed using a mathematical model for the sensor-response lag and the gas-concentration changes in buffer and measurement chambers. In concrete terms, the response of the apparatus was investigated for various substitution rates of chamber gas or for buffer ratios. The results showed that the adequate substitution rates for buffer ratios were needed for adjusting measurement time. In addition, an apparatus was actually assembled and tested for its performance, and system design guidelines were established.

【 授权许可】

Unknown