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植物在水分胁迫条件下关闭气孔，以尽量减少水分耗散．但是气孔关闭不是整齐划一的行为，气孔的不均匀关闭会引起叶温的非均匀分布．本实验用了同精度下的生物多点温度仪、红外测温仪，对甘薯苗叶片下表面和上表面主脉周围与叶周边进行了同步温度测定，并用判别分析法对这些数据作了分析处理．结果表明：发生水分胁迫时，甘薯叶片下表面主脉周围的温度高于叶周边的温度，这两个温度的差值可以作为水分胁迫的指标：判断水分胁迫的温差阈值是0.8℃；对温度测定仪的精度要求是0.2℃．
Plants are closed to stomata under water stress to minimize moisture dissipation. However, stomatal closure is not a uniform behavior, stomatal uneven closure can cause non-uniform leaf temperature distribution. In this experiment, with the same precision biological multi-point temperature meter, infrared thermometer, the sweet potato seedling leaf surface and the upper surface of the main vein around the circumference of the leaves and the temperature were measured and discriminant analysis of these data were analyzed deal with. The results showed that when the water stress occurred, the temperature around the main vein of the lower surface of sweet potato was higher than the temperature around the leaf, and the difference between these two temperatures could be used as an indicator of water stress. The threshold of temperature difference for water stress was 0.8 ℃, The accuracy of the analyzer is 0.2 ℃.