Transpiration and photosynthesis of holm oak trees in southern Spain
“Dehesas”, the Iberian semi-natural woodlands based on large holm oak (Quercus ilex L.) trees, represent a key agroforestry system in Spain and Portugal sustaining relevant economic activities (e.g. “iberico” pork feeding, truffle) and ecosystem services. Despite of their importance, scarce information is still available regarding both the transpiration (Ep) and photosynthesis of holm oaks growing in dehesas and the effects of irrigation on these fluxes. Two experiments were performed in Espiel and Hinojosa del Duque (southern Spain) where sap flow was measured in large trees between 2009 and 2011 and photosynthesis was measured with a transitory-closed chamber in smaller trees at different moments of 2009. In 2009, half of the trees equipped with sap flow sensors were drip irrigated and half were rainfed. However, the supply of irrigation barely affected Ep and shoot water potential. The seasonal course of Ep peaked in late spring and decreased gradually, reaching minimum values during winter. Vapor pressure deficit (VPD) exerted a strong control over canopy conductance and its seasonal variation was identified as a major driver for the observed patterns of Ep. Photosynthesis showed a similar course as that of Ep but there was a second smaller peak in autumn. Seasonal water use efficiency was remarkably high due to the reduced summer Ep. Our results also indicate that hyperbolic models of canopy conductance and water use efficiency in response to VPD may be used to estimate diurnal and seasonal Ep and net photosynthesis of holm oak if the tree size and leaf area density are known.
Main Authors: | , , , |
---|---|
Format: | artículo biblioteca |
Published: |
Elsevier
2021-09
|
Subjects: | Quercus, Water use, Canopy conductance, Water Use Efficiency, Irrigation, Sap-flow, Gas-exchange chamber, |
Online Access: | http://hdl.handle.net/10261/268156 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-ias-es-10261-268156 |
---|---|
record_format |
koha |
spelling |
dig-ias-es-10261-2681562022-04-29T02:20:03Z Transpiration and photosynthesis of holm oak trees in southern Spain Morales, Alejandro López-Bernal, Álvaro Testi, Luca Villalobos, Francisco J. Quercus Water use Canopy conductance Water Use Efficiency Irrigation Sap-flow Gas-exchange chamber “Dehesas”, the Iberian semi-natural woodlands based on large holm oak (Quercus ilex L.) trees, represent a key agroforestry system in Spain and Portugal sustaining relevant economic activities (e.g. “iberico” pork feeding, truffle) and ecosystem services. Despite of their importance, scarce information is still available regarding both the transpiration (Ep) and photosynthesis of holm oaks growing in dehesas and the effects of irrigation on these fluxes. Two experiments were performed in Espiel and Hinojosa del Duque (southern Spain) where sap flow was measured in large trees between 2009 and 2011 and photosynthesis was measured with a transitory-closed chamber in smaller trees at different moments of 2009. In 2009, half of the trees equipped with sap flow sensors were drip irrigated and half were rainfed. However, the supply of irrigation barely affected Ep and shoot water potential. The seasonal course of Ep peaked in late spring and decreased gradually, reaching minimum values during winter. Vapor pressure deficit (VPD) exerted a strong control over canopy conductance and its seasonal variation was identified as a major driver for the observed patterns of Ep. Photosynthesis showed a similar course as that of Ep but there was a second smaller peak in autumn. Seasonal water use efficiency was remarkably high due to the reduced summer Ep. Our results also indicate that hyperbolic models of canopy conductance and water use efficiency in response to VPD may be used to estimate diurnal and seasonal Ep and net photosynthesis of holm oak if the tree size and leaf area density are known. 2022-04-28T11:40:20Z 2022-04-28T11:40:20Z 2021-09 2022-04-28T11:40:20Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.tfp.2021.100115 e-issn: 2666-7193 Trees, Forests and People 5: 100115 (2021) http://hdl.handle.net/10261/268156 10.1016/j.tfp.2021.100115 Publisher's version http://dx.doi.org/10.1016/j.tfp.2021.100115 Sí open Elsevier |
institution |
IAS ES |
collection |
DSpace |
country |
España |
countrycode |
ES |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-ias-es |
tag |
biblioteca |
region |
Europa del Sur |
libraryname |
Biblioteca del IAS España |
topic |
Quercus Water use Canopy conductance Water Use Efficiency Irrigation Sap-flow Gas-exchange chamber Quercus Water use Canopy conductance Water Use Efficiency Irrigation Sap-flow Gas-exchange chamber |
spellingShingle |
Quercus Water use Canopy conductance Water Use Efficiency Irrigation Sap-flow Gas-exchange chamber Quercus Water use Canopy conductance Water Use Efficiency Irrigation Sap-flow Gas-exchange chamber Morales, Alejandro López-Bernal, Álvaro Testi, Luca Villalobos, Francisco J. Transpiration and photosynthesis of holm oak trees in southern Spain |
description |
“Dehesas”, the Iberian semi-natural woodlands based on large holm oak (Quercus ilex L.) trees, represent a key agroforestry system in Spain and Portugal sustaining relevant economic activities (e.g. “iberico” pork feeding, truffle) and ecosystem services. Despite of their importance, scarce information is still available regarding both the transpiration (Ep) and photosynthesis of holm oaks growing in dehesas and the effects of irrigation on these fluxes. Two experiments were performed in Espiel and Hinojosa del Duque (southern Spain) where sap flow was measured in large trees between 2009 and 2011 and photosynthesis was measured with a transitory-closed chamber in smaller trees at different moments of 2009. In 2009, half of the trees equipped with sap flow sensors were drip irrigated and half were rainfed. However, the supply of irrigation barely affected Ep and shoot water potential. The seasonal course of Ep peaked in late spring and decreased gradually, reaching minimum values during winter. Vapor pressure deficit (VPD) exerted a strong control over canopy conductance and its seasonal variation was identified as a major driver for the observed patterns of Ep. Photosynthesis showed a similar course as that of Ep but there was a second smaller peak in autumn. Seasonal water use efficiency was remarkably high due to the reduced summer Ep. Our results also indicate that hyperbolic models of canopy conductance and water use efficiency in response to VPD may be used to estimate diurnal and seasonal Ep and net photosynthesis of holm oak if the tree size and leaf area density are known. |
format |
artículo |
topic_facet |
Quercus Water use Canopy conductance Water Use Efficiency Irrigation Sap-flow Gas-exchange chamber |
author |
Morales, Alejandro López-Bernal, Álvaro Testi, Luca Villalobos, Francisco J. |
author_facet |
Morales, Alejandro López-Bernal, Álvaro Testi, Luca Villalobos, Francisco J. |
author_sort |
Morales, Alejandro |
title |
Transpiration and photosynthesis of holm oak trees in southern Spain |
title_short |
Transpiration and photosynthesis of holm oak trees in southern Spain |
title_full |
Transpiration and photosynthesis of holm oak trees in southern Spain |
title_fullStr |
Transpiration and photosynthesis of holm oak trees in southern Spain |
title_full_unstemmed |
Transpiration and photosynthesis of holm oak trees in southern Spain |
title_sort |
transpiration and photosynthesis of holm oak trees in southern spain |
publisher |
Elsevier |
publishDate |
2021-09 |
url |
http://hdl.handle.net/10261/268156 |
work_keys_str_mv |
AT moralesalejandro transpirationandphotosynthesisofholmoaktreesinsouthernspain AT lopezbernalalvaro transpirationandphotosynthesisofholmoaktreesinsouthernspain AT testiluca transpirationandphotosynthesisofholmoaktreesinsouthernspain AT villalobosfranciscoj transpirationandphotosynthesisofholmoaktreesinsouthernspain |
_version_ |
1777663346929041408 |