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Spatial sap flow and xylem anatomical characteristics in olive trees under different irrigation regimes

AutorLópez-Bernal, Álvaro ; Alcántara, Esteban; Testi, Luca ; Villalobos, Francisco J. ; Phillips, Nathan
Palabras claveTranspiration
Compensated heat pulse
Deficit irrigation
Xylem conductivity
Fecha de publicación2010
EditorOxford University Press
CitaciónTree Physiology 30(12): 1536-1544 (2010)
ResumenThe compensation heat pulse (CHP) method is widely used to estimate sap flow and transpiration in conducting organs of woody plants. Previous studies have reported a natural azimuthal variability in sap flow, which could have practical implications in locating the CHP probes and integrating their output. Sap flow of several olive trees (Olea europaea L. cv. 'Arbequina') previously grown under different irrigation treatments were monitored by the CHP method, and their xylem anatomical characteristics were analyzed from wood samples taken at the same location in which the probes were installed. A significant azimuthal variability in the sap flow was found in a well-irrigated olive tree monitored by eight CHP probes. The azimuthal variability was well related to crown architecture, but poorly to azimuthal differences in the xylem anatomical characteristics. Well-irrigated and deficit-irrigated olive trees showed similar xylem anatomical characteristics, but they differed in xylem growth and in the ratio of nocturnal-to-diurnal sap flow (N/D index). The results of this work indicate that transpiration cannot be accurately estimated by the CHP method in olive trees if a small number of sensors are employed and that the N/D index could be used as a sensitive water status indicator. © The Author 2010. Published by Oxford University Press. All rights reserved.
URIhttp://hdl.handle.net/10261/92207
DOI10.1093/treephys/tpq095
Identificadoresdoi: 10.1093/treephys/tpq095
issn: 0829-318X
e-issn: 1758-4469
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