Evapotranspiration Partitioning from Sap Flow and Eddy Covariance Techniques for Olive Orchards in Semi-Arid Region

被引：10

作者：

Er-Raki, S. ^{[1
]}

Chehbouni, A. ^{[1
]}

Ezzahar, J. ^{[1
]}

Khabba, S. ^{[1
]}

Boulet, G. ^{[1
]}

Hanich, L. ^{[1
]}

Williams, D. ^{[1
]}

机构：

[1] Cadi Ayyad Univ, Fac Sci Semlalia, Ctr Geber Salle 26, Projet SudMed, Marrakech, Morocco

来源：

VII INTERNATIONAL WORKSHOP ON SAP FLOW | 2009年 / 846卷

关键词：

olive; evapotranspiration; eddy covariance; sap flow; partition; CHIHUAHUAN DESERT; WATER; PULSE; TRANSPIRATION; EVAPORATION; ISOTOPE; TREES; WOODY;

D O I：

10.17660/ActaHortic.2009.846.21

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

An eddy covariance (EC) and sap flow (SF) systems were combined for partitioning evapotranspiration (ET) into soil and plant components over olive orchards under drip and flood irrigation in semi-arid region. The EC system provides the total ET while the sap flow method measures only the transpiration. Measurements of xylem sap flow indicated that sap flow: (1) decreased rapidly with depth in xylem; and (2) correlated with the reference evapotranspiration (ET0). Sap flow measurements were scaled up using a survey of the average ground area of the trees in order to estimate Ecosystem-scale transpiration. A comparison of sap flow with eddy covariance measurements showed that the ratio of transpiration to total evapotranspiration (T/ET) was about 0.87 over irrigated olive under drip irrigation. However, this ratio is about 1 over irrigated olive under flood irrigation in dry conditions and decreases to about 0.65 in wet conditions (during the irrigation). An amount of 35% of water was lost by direct soil evaporation due to flood irrigation, can be saved or minimized by the choice of an adequate irrigation like localized drip irrigation.

引用

页码：201 / 208

页数：8

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