作物群落の生産機能および状態の非破壊非接触診断に関する研究 : 第1報自然条件下における作物キャノピーの熱画像解析

概要

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The present study was aimed to obtain basic knowledge to monitor the physiological and ecological function or state of crop communities remotely. This paper deals with the temperature distribution of crop canopies investigated with and infrared scanning therometer. The results obtained are summarized as follows : 1. The emissivity of crop canopy was estimated at approximately 1.0 with wheat, maize, soybean and sunflower according to the measurement as to their leaf blades (Table 1). 2. The range of canopy temperature was relatively small compared with diurnal change of air terperature or canopy temperature. The distribution pattern of canopy temperature was fitted to gaussian distribution very well. Standard deviation and range of each canopy temperature were estimated at 0.2〜0.8℃ and 1〜3℃ respectively (Figs. 3〜5). 3. Eeven if there were some structural differences within a canopy the change of distribution of canopy temperature was not significant as far as a field of view was set to a rather uniform part of such canopies (Fig. 6). 4. The temperature distribution of wheat canopy with panicles was biased from gaussian pattern because of high temperature of panicles (Fig. 7). 5. The range of temperature distribution tended to increase with increment of the dip of view. But setting a field of view fully to foliage with 10〜20° dip, canopy temperature was not affected very much by the dip (Table 2).
日本作物学会の論文
1986-06-05