AIR HUMIDITY WITHIN BOUNDARY LAYER OF A TRANSPIRING LEAF : I. RELATIONSHIP BETWEEN TRANSPIRATION AND WATER VAPOR DENSITY AT LEAF SURFACE
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A simple system for on-line measurement of water vapor density within leaf boundary layer was developed, and water vapor density (W_<BO>) at the cucumber leaf surface was analyzed in relation to transpiration rate (E). In the system, air near the leaf surface was sampled continuously through a capillary tube (φ0.4mm) and drawn into a sampling capsule (1.2cm^3 in volume) by using an air pump. Temperature and relative humidity of the sampled air were measured by a T-thermocouple (φ0.1mm) and a small sized humidity sensor of an electric capacitance meter (4mm×6mm×0.2mm) installed in the sampling capsule, respectively. Water vapor density of the sampled air was calculated from the air temperature and relative humidity measured. The system was reliable for understanding dynamics of transpired water vapor in leaf boundary layer and humidity condition to which leaf is exposed directly: W_<BO> was higher than water vapor density (W_A) of ambient air outside the boundary layer and varied with E as affected by evaporative demand and stomatal movement. W_<BO>-W_A was directly proportional to E, and the proportionality was dependent on characteristics of air current and the sampling position of the W_<BO> measurements.
- 九州大学の論文
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