Comparison of Evapotransiration Variation Among Different Vegetative Canopies Using ��Decoupling�� Theory
Journal
Journal of Agricultural Meteorology
Journal Volume
52
Journal Issue
5
Pages
497-500
Date Issued
1997
Author(s)
Abstract
The decoupling theory presented by Jarvis and McNaughton (1986) was used in the comparison of the evapotranspiration characteristics of forest, corn and alfalfa canopies. The average values of the decoupling factor Ωcwere 0.53, 0.74 and 0.88 in the forest, corn and alfalfa, respectively, which was in the opposite order for the aerodynamic roughness of the canopies. Ωcvaried largely with the change of the canopy resistance. The Ωcindicated the variability of the ratio of the evapotranspiration to the available energy (lE/A). When Ωcì 0.8, the reliability of the evapotranspiration models based on the available energy (e.g. Priestley-Taylor model) should decrease. © 1997, The Society of Agricultural Meteorology of Japan. All rights reserved.
SDGs
Type
journal article