Abstract
Infrared thermometers have been adopted for measurements of surface temperature, and are used routinely to measure the temperature of the earth's surface from satellites. To obtain accurate measurements of surface temperature by infrared thermometry, it is necessary to know the surface emissivity in the atmospheric window region. In this study, emissivities of plant leaves and canopies were measured by the box method using an infrared thermometer.Results are summarized as follows:(1) Soil emissivity increases with an increase in soil water.(2) The emissivity of potato leaves was lowest among the six varieties of plants measured, and that of gramineous leaves was the highest.(3) Inclination angles of leaves less than 60° do not affect leaf emissivity.(4) Higher emissivities of leaves lead to higher values for plant canopy emissivities.(5) The water content of soil has an effect on the emissivities of plant canopies.(6) When vegetation cover is heavy, the emissivities of plant canopies are close to, or greater than, those of leaves.Above and the reported results confirmed that plant leaf temperature is measured with considerable accuracy, if a value of 0.97 or 0.98 is used for the emissivity setting of the infrared thermometer. A value of -0.04-+0.01 must be added to plant leaf emissivity for measurements of canopy temperature.
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