AIR HUMIDITY WITHIN BOUNDARY LAYER OF A TRANSPIRING LEAF : I. RELATIONSHIP BETWEEN TRANSPIRATION AND WATER VAPOR DENSITY AT LEAF SURFACE

摘要: KITANO M. and EGUCHI H. Air humidity within boundary layer ofa transpiring leaf. 1. Relationship between transpiration water vapor density at leafsurface. BIOTRONICS 16, 39-45, 1987. A simple system for on-line measurement of leaf was developed, (WBO) the cucumber surface analyzed in relation to rate (E). In system, air near sampled continuously through a capillary tube (~0.4 mm) drawn into sampling capsule (1.2 cm3 volume) by using an pump. Temperature relative were measured T-thermocouple (~0.1 small sized sensor electric capacitance meter (4 mm x 6 mmx 0.2 installed capsule, respectively. Water calculated from temperature measured. The reliable understanding dynamics transpired condition which is exposed directly: WBO higher than (WA ) ambient outside varied with E as affected evapora­ tive demand stomatal movement. WBO-WA directly proportional E, proportionality dependent on characteristics current position measurements.