Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress

26 páginas, 10 figuras, 1 tabla, 32 referencias.-- cmartin@irnase.csic.es

Detalhes bibliográficos
Autores: Fernández Luque, José Enrique, Martín Palomo, Mª José, Díaz-Espejo, Antonio, Clothier, Brent, Green, S. R., Girón Moreno, Ignacio F., Moreno Lucas, Félix
Tipo de documento: artigo
Data de publicação:2001
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/47511
Acesso em linha:http://hdl.handle.net/10261/47511
Access Level:Acceso aberto
Palavra-chave:Olive
Water stress
Roots
Heat pulse
Hydraulic behaviour
Xylem
Embolisms
id ES_e02b0b0af91db736acd93b51161dedaf
oai_identifier_str oai:digital.csic.es:10261/47511
network_acronym_str ES
network_name_str España
repository_id_str
spelling Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stressFernández Luque, José EnriqueMartín Palomo, Mª JoséDíaz-Espejo, AntonioClothier, BrentGreen, S. R.Girón Moreno, Ignacio F.Moreno Lucas, FélixOliveWater stressRootsHeat pulseHydraulic behaviourXylemEmbolisms26 páginas, 10 figuras, 1 tabla, 32 referencias.-- cmartin@irnase.csic.esThe compensation heat-pulse method for measuring sap flow is tested here in olive trees (Olea europaea L.). We describe a rigorous three-way examination of the robustness of the technique for this species, and examine the potential of the technique for an automatic control of the irrigation system. Two tests were carried out using heat-pulse gear inserted into the stem of 12-year-old ‘Manzanilla’ olive trees. One test used forced-flow through a stem section, and the other involved measured water uptake by an excised tree. The measured sap flow in these two tests was in agreement with calculations from heat-pulse velocities when using a standard ‘wound correction’ to account for the presence of the probes and the disruption to the sap flow. Thus, this technique for monitoring transpiration can, we feel, be used with confidence in olives. The third experiment was carried out in the field, where we analysed sap flow data from two 29- year-old olive trees—one tree was under regular drip irrigation and the other was from dry-farming conditions. We use measurements of sap flow in the trunk to examine the hydraulic functioning of the tree, and to explore some diagnostics of water stress. Our heat-pulse measurements in the irrigated olive tree exhibited a profile of sap flow that was weighted towards the outer xylem of the tree trunk while the water-stressed trees in the field showed a profile of sap flow weighted towards the centre of the trunk. The loss of hydraulic functioning in the outermost section of the vascular system, as a result of water stress, we consider to be due both to stomatal control and to embolisms in the xylem vessels. The fourth experiment was also carried out in the field, in which sap flow measurements were made at three locations in the trunk as well as in two roots of another 29-year-old olive tree. The soil explored by each root, on opposite sides of the trunk, was differentially wetted by separate irrigation of each side. Our data showed that the surface roots were able to absorb water immediately after wetting, despite a reasonably prolonged period of moderate drought. Root activity quickly shifted to the regions where the soil had been wetted. A root in dry soil exhibited no flow at night, whereas sap flows of about 0.02 l h 1 were measured around midnight in the root drawing water from the wetter soil. Our observations suggest that the hydraulic behaviour of the trunk and surface roots might be used as a diagnostic of the onset, or severity, of water stress. Here there is not the imperative to replicate, for the prime goal is not transpiration estimation. Rather interpretation of the diurnal dynamics is used to infer the onset, or severity of water stress. The compensation heat-pulse seems a suitable technique for automatically controlling the irrigation system of olives, and probably other trees, based either on the estimation of the short-time dynamics of transpiration, or on changes in the hydraulic behaviour of the trees.The Comisión Interministerial de Ciencia y Tecnología of the Spanish Ministry of Education and Science financial support this project.Peer reviewedElsevierMinisterio de Educación y Ciencia (España)201220122001info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/47511reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/s0378-3774(01)00119-6info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/475112026-05-22T06:33:51Z
dc.title.none.fl_str_mv Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
title Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
spellingShingle Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
Fernández Luque, José Enrique
Olive
Water stress
Roots
Heat pulse
Hydraulic behaviour
Xylem
Embolisms
title_short Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
title_full Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
title_fullStr Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
title_full_unstemmed Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
title_sort Heat-pulse measurements of sap flow in olives for automating irrigation: tests, root flow and diagnostics of water stress
dc.creator.none.fl_str_mv Fernández Luque, José Enrique
Martín Palomo, Mª José
Díaz-Espejo, Antonio
Clothier, Brent
Green, S. R.
Girón Moreno, Ignacio F.
Moreno Lucas, Félix
author Fernández Luque, José Enrique
author_facet Fernández Luque, José Enrique
Martín Palomo, Mª José
Díaz-Espejo, Antonio
Clothier, Brent
Green, S. R.
Girón Moreno, Ignacio F.
Moreno Lucas, Félix
author_role author
author2 Martín Palomo, Mª José
Díaz-Espejo, Antonio
Clothier, Brent
Green, S. R.
Girón Moreno, Ignacio F.
Moreno Lucas, Félix
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Educación y Ciencia (España)
dc.subject.none.fl_str_mv Olive
Water stress
Roots
Heat pulse
Hydraulic behaviour
Xylem
Embolisms
topic Olive
Water stress
Roots
Heat pulse
Hydraulic behaviour
Xylem
Embolisms
description 26 páginas, 10 figuras, 1 tabla, 32 referencias.-- cmartin@irnase.csic.es
publishDate 2001
dc.date.none.fl_str_mv 2001
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/47511
url http://hdl.handle.net/10261/47511
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/s0378-3774(01)00119-6
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422177472741376
score 15,812429

Registros relacionados