摘要： 用红外热像非接触地检测物体的温度已经在许多领域得以应用，本研究旨在用该法检测树木的枝叶温度。通过阳光直射加热升温的过程，用红外热像监测一些树木枝叶的温度变化，检测到了由于水分含量和蒸腾强度的不同而造成不同枝叶部位的比热和潜热的差别。应用红外热像不仅可以检测这些树木叶温和枝叶枯死，而且还成功地探测到了断脉后北美枫香叶片的蒸腾衰减现象。专门设计的断脉试验使北美枫香(Liquidambar styraciflua L.) 叶片局部水分亏缺和增温，使其成为研究叶温和蒸腾冷却的特殊材料。断脉叶片上温度梯度的存在使得热像拍摄更加容易，系统误差也小;同一叶片上断脉和未断脉裂片的可比性更高。此外还观测到了北美枫香断脉叶片上明显的高温区，这些高温区域与叶色变红部位相吻合。
关键词：热红外图像;一些绿化树木;切脉;叶温;枝叶枯死;蒸腾冷却衰减;叶变红
Abstract：Noninvasive detection of temperature with thermography from natural things has been used in many fields and it was attempted to detect the temperature for leaves and branches of trees in the present paper. Leaf and twig temperatures were monitored during the increasing process of temperature under the direct sunshine heating. The difference of specific heat and latent heat from leaves and twigs caused by different water content and transpiration capacity were measured. Not only the leaf temperature, scorch and branch dieback were detected, but the transpiration cooling fail of sweetgum (Liquidambar styraciflua L.) leaves was successfully measured by using thermography. In this study, the local water stress characteristics on sweetgum leaves from specially designed vein severing became special materials for studying the leaf temperature or transpiration failure. The temperature gradient on severed leaf made the thermo image taking easy, with less systematical error. Direct comparison between non-severed lobes and vein-severed lobes on the same leaf lamina makes it more comparable. According to thermography analysis, significant high temperature area was observed and there existed the consistence between high temperature area and the reddened leaf lamina.
王 斐1，山本晴彦2 . 用红外热像法检测一些树木枝叶温度的研究 [J]. 光谱学与光谱分析, 2010, 30(11): 2914-2918.
WANG Fei1，Haruhiko YAMAMOTO2 . Detecting Leaf and Twig Temperature of Some Trees by Using Thermography . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(11): 2914-2918.
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