The temperature of plants can be measured using infrared (IR) thermography. Despite the extensive use of IR imaging indoors, outdoor IR imaging is uncommon. We used IR imaging to compare leaf temperatures between necrotic spots and healthy areas of oriental cherry (Prunus serrulata var. spontanea), Japanese cornel (Cornus officinalis) and sawtooth oak (Quercus acutissima) in the field. There was a significant difference in the mean leaf temperatures between the necrotic spots (26.4°C) and healthy areas (25.6°C) of oriental cherry (p = .01). The mean temperatures in the necrotic spots of Japanese cornel and sawtooth oak leaves were 22.3°C and 29.6°C, respectively, which were not significantly different from the mean temperatures of the healthy areas. A consecutive, 2‐day temporal leaf analysis in October 2018 revealed that the temperatures in the necrotic spots were generally higher than those in the healthy areas of the three species. The temperature difference between the spots and healthy areas (up to 1.4°C) was more pronounced at 13:00 hr in all three species on both days. These results reveal differences in the spatial and temporal thermal state across the necrotic spotted leaves. There is potential for use of outdoor IR imaging to visualize the response of trees to pathogen infection and abiotic stress.

中文翻译：

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用于时空热成像的室外红外成像：以木本植物坏死叶与健康叶区域为例

可以使用红外（IR）热像仪测量植物的温度。尽管在室内广泛使用IR成像，但室外IR成像并不常见。我们使用IR成像比较坏死斑和樱花（健康区域之间叶温度山樱变种spontanea），日本茱萸（山茱萸）和锯齿橡木（麻栎在现场）。东方樱桃的坏死斑（26.4°C）和健康区域（25.6°C）之间的平均叶片温度存在显着差异（p = .01）。日本山茱el和锯齿橡树叶的坏死斑的平均温度分别为22.3°C和29.6°C，与健康地区的平均温度没有显着差异。2018年10月连续进行了为期2天的颞叶分析，发现坏死斑的温度通常高于这三种物种健康区域的温度。在这两天，所有三个物种的斑点和健康区域之间的温差（最高1.4°C）在13:00时更为明显。这些结果揭示了整个坏死斑叶的时空热态差异。有可能使用室外红外成像来可视化树木对病原体感染和非生物胁迫的反应。