日本の圃場条件下における葉気温較差を用いた作物のかんばつ回避性の評価

日本作物学会紀事

谷 英雄¹  福岡 峰彦¹  長谷川 利拡¹  実山 豊¹  岩間 和人¹ 

[1] 北海道大学

关键词: 群落表面温度;    Thermography;    サーモグラフィー;    Lowland rice;    水稲;    Infrared thermometry;    赤外放射測温;    Sugar beet;    テンサイ;    熱赤外画像;    Potato;    バレイショ;    Upland rice;    陸稲;    Paddy rice;   

DOI  :  10.1626/jcs.72.461

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The difference between canopy temperature and air temperature (ΔT) is reported to be a convenient criterion for the non-destructive evaluation of drought avoidance of crop varieties under field conditions in arid countries, where vapor pressure deficit (VPD) is high. We examined its validity under field conditions in Japan, where VPD is low. We defined the drought avoidance as the ability to maintain stomatal conductance (gs) and leaf water potential (LWP) under non-irrigated conditions as high as those under fully irrigated conditions. Four crops (sugar beet, potato and two rice genotypes of upland and lowland), which were assumed to be greatly different in drought avoidance, were grown in both fully irrigated and non-irrigated fields under a rain shelter. For five weeks starting from the 7th week after planting, ΔT was measured by infrared thermography, in concurrence with the measurement of gs and LWP. In the non-irrigated plot, ΔT, gs and LWP differed significantly among the crops; lowland rice showed the highest ΔT and the lowest gs and LWP, followed by upland rice, potato and sugar beet. Meanwhile, in the irrigated plot, their differences were relatively small. There was significant interaction between irrigation treatment and crop in ΔT, gs and LWP (all p<0.001). These results indicate that the difference in drought avoidance among crops can be evaluated under field conditions in Japan, using ΔT under non-irrigated conditions.

【 授权许可】

Unknown