Transpirational Surges in Tamarix and Eucalyptus as Measured with an Infrared Gas Analyzer

Abstract

Continuous measurements were made on an intact twig or leaf under controlled light and temperature. Transpiration increased smoothly to a new constant rate during illumination and decreased smoothly upon darkening. When a twig or petiole was cut in air, transpiration surged and declined. When the cut was made under water, transpiration usually slowed to a new constant rate and surged briefly when the cut was later exposed to air.