%0 Conference Proceedings
%9 ACTI : Communications avec actes dans un congrès international
%A Er-Raki, S.
%A Khabba, S.
%A Erraji, T.
%A Ezzahar, J.
%A Jarlan, Lionel
%A Le Page, M.
%A Chehbouni, Abdelghani
%A Hanich, L.
%T Evaluation of the sap flow measurements determined with heat balance method for citrus orchards in semi-arid region
%S Proceedings of the VIIIth international workshop on sap flow
%C Leuven
%D 2012
%E Sebastiani, L.
%E Tognetti, R.
%E Motisi, A.
%L fdi:010060188
%G ENG
%I ISHS
%K EVAPOTRANSPIRATION ; CULTURE IRRIGUEE ; IRRIGATION ; VERGER ; METHODE D'ANALYSE ; ETUDE COMPARATIVE
%K FLUX DE SEVE ; CHALEUR ; BRANCHE
%K MAROC ; ZONE SEMIARIDE
%N 951
%P 259-267
%U https://www.documentation.ird.fr/hor/fdi:010060188
%> https://www.documentation.ird.fr/intranet/publi/depot/2013-11-28/010060188.pdf
%W Horizon (IRD)
%X Sap flow measurements based on heat balance method gives a direct measurement of the mass flow rate of sap in the stem. However, extrapolation of these measurements from the stem to the field scale is an important challenge. In this study, 15 branches of citrus trees with different diameters were equipped with Dynamax sap flow gauge. These individual branch measurements have been after extrapolated to the canopy transpiration by using two up-scaling methods. The first one uses the relationship between sap flow and branches diameter and the second one uses the distribution of the branch diameter in the orchards. The results showed a good agreement between the two methods estimates (R2=0.95). A comparison between scaled-up transpiration from sap flow and measured evapotranspiration (ETed) by eddy covariance showed an average daily difference of about 0.87 mm/day which represents 25% of ETed. This substantial amount of water was lost through soil evaporation and part of it could be saved by improving the drip irrigation management.
%B International Workshop on Sap Flow
%8 2011/05/08-12
%$ 076AGRO09 ; 072AGRMET02