水稲群落を基準とした群落表面温度の計測による転換畑ダイズ圃場の水ストレス評価

日本作物学会紀事

本間 香貴¹  白岩 立彦¹ 

[1] 京都大学大学院農学研究科

关键词: Aerodynamic resistance;    空気力学的抵抗;    Canopy resistance;    植被抵抗;    Soybean;    ダイズ;    Heat budget equation;    熱収支式;    Remote-sensing;    リモートセンシング;   

DOI  :  10.1626/jcs.78.387

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In order to evaluate water stress in soybean grown in farmer paddy fields in Japan, we developed a water stress index simplified by incorporating canopy temperature of rice into a heat budget equation on the soybean canopy. For the simplification, we assumed that: (1) the aerodynamic resistances in soybean and rice canopies are the same and (2) the canopy resistance of rice does not differ among fields. Based on these assumptions, we expressed the evaporation rate of soybean against that of rice (1−ES/ER) as a simple function of the difference in temperature between soybean and rice canopies and gradient of vapor pressure between rice canopy and air. Numerical analysis suggested that estimation error of 1−ES/ER is relatively small. Measurement of water stress in soybean in farmer’s fields indicated that variation of 1−ES/ER among measured occasions was small, and that 1−ES/ER was a good index of water stress comparable to the Crop Water Stress Index (CWSI). These results indicated that this method could be used to evaluate water stress in soybean in farmer paddy fields.

【 授权许可】

Unknown