Weighing whole trees transpiration rate of urban trees and analysis of tree's morpho-physiological effects

Abstract

The purpose of this study is to grasp the variation of whole tree transpiration rates and capacities of container-grown isolated trees and to analyze tree's morpho-physiological effects. We developed hanging-type gravimeter and weighed 11 species (h=3~6.7m). We found (1)Daily water use in summer irrigation days were 10~30kg, equivalent to 0.62±0.36 times of water evaporation from the same size of crown projection area, (2)Maximum latent heat was 2.3 kW/tree, (3)Same tree's capacity can change threefold due to physiological change, (4)Ring-porous species tend to use much water, which suggest the significance of hydraulic capacity under volume-restricted soil condition.