Seasonal variation of water uptake of a Quercus suber tree in Central Portugal

Nadezhdina, Nadezhda; Ferreira, Maria Isabel; Silva, Rodolfo; Pacheco, Carlos Arruda

doi:10.1007/s11104-007-9398-y

Cited by 63 publications

(59 citation statements)

References 48 publications

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“…9) suggest that A. unedo and Q. ilex have a different distribution of the root absorbing surfaces. In fact, according to Nadezhdina et al (2008), superficial roots are mainly connected with the outer xylem, while the deep roots are preferentially connected with the inner xylem. The observed change in radial pattern in A. unedo, but not in Q. ilex, thus suggests that A. unedo should have more evenly vertically distributed roots, being able to use both water resources (superficial water, when present, and groundwater), while Q. ilex should draw most water from a reliable water resource (water table).…”

Section: Discussionmentioning

confidence: 99%

An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem

et al. 2009

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Abstract. An integrated approach has been used to analyse the dependence of three Mediterranean species, A. unedo L., Q. ilex L., and P. latifolia L. co-occurring in a coastal dune ecosystem on two different water resources: groundwater and rainfed upper soil layers. The approach included leaf level gas exchanges, sap flow measurements and structural adaptations between 15 May and 31 July 2007. During this period it was possible to capture different species-specific response patterns to an environment characterized by a sandy soil, with a low water retention capacity, and the presence of a water table. The latter did not completely prevent the development of a drought response and, combined with previous studies in the same area, response differences between species have been partially attributed to different root distributions. Sap flow of A. unedo decreased rapidly with the decline of soil water content, while that of Q. ilex decreased only moderately. Midday leaf water potential of P. latifolia and A. unedo ranged between −2.2 and −2.7 MPa throughout the measuring period, while in Q. ilex it decreased down to −3.4 MPa at the end of the season. A. unedo was the only species that responded to drought with a decrease of its leaf area to sapwood area ratio from 23.9±1.2 (May) to 15.2±1.5 (July). While A. unedo also underwent an almost stepwise loss on hydraulic conductivity, such a loss did not occur for Q. ilex, whereas P. latifolia was able to slightly increase its hydraulic conducitivity. These differences show how different plant compartments coordinate differently between species in their responses to drought. The different responses appear to be mediated by different root distributions of the species and their relative resistances to drought are likely to depend on the duration of the periods in which water remains extractable in the upper soil layers.

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Section: Discussionmentioning

confidence: 99%

An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem

et al. 2009

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“…Paco et al (2009) described high transpiration of the oak in the steppe conditions even during the dry period. Similarly, Nadezhdina et al (2007) described the hydraulic redistribution of Q. suber roots from the surface soil to deeper layers (depths of up to 5 m), reflecting a dependence on water availability.…”

Section: Discussionmentioning

confidence: 99%

Transpiration and stomatal conductance of mistletoe (Loranthus europaeus) and its host plant, downy oak (Quercus pubescens)

et al. 2012

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Sap flow rate was measured in the crown of a solitary specimen of downy oak (Quercus pubescens) infested by mistletoe (Loranthus europaeus). Five oak branches and two mistletoe plants were selected for analysis. The seasonal sum of transpired water expressed per leaf area unit was five times higher in the mistletoe than in the oak. In addition, the diurnal curves of sap flow were different between the plants. In the morning, the sap flow measured in the mistletoe lagged one hour behind the sap flow measured in an oak branch unencumbered by mistletoe. In contrast, no time lag was observed in the evening. The proportion of water transpired at night relative to the total transpiration was 7% in both species. The stomatal conductances derived from the inverted Penman-Monteith equation and their dependence on global radiation and the vapour pressure deficit (D) revealed that D exerts a different behaviour in stomatal control of transpiration in the mistletoe. We also determined that the concentration of calcium in the leaf mass could serve as a proxy for transpiration rate, however the relationship was not proportional.

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“…Sap flux densities (SFD) calculated from the measured temperature gradients (Nadezhdina et al, 2008) show only the situation at a certain stem sector, which could vary in circumferential direction. Thus, they should be used only qualitatively as a tool for the topological study of the vascular system of a tree.…”

Section: Sap Flow Measurements By the Heat Field Deformation Methodsmentioning

confidence: 99%

Intégration des voies de transport de l’eau dans un érable : réponses du flux de sève à une ablation de branche

Nadezhdina

2010

Ann. For. Sci.

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Keywords:Acer platanoides / flux distribution / heat field deformation method / integrated pipes / multi-point sensors / stem xylem functional structure Abstract • It has been known for a long time that sectored and integrated patterns of vascular systems exist in different species and even within the same tree, depending on its age and history. However, very few publications consider the topology of the vascular pathways between roots and branches.• Some results on this important aspect of the vascular system are presented in this paper. They have been obtained with adult maple trees by directly studying the water movement in the stem and root xylem with the heat field deformation (HFD) method for sap flow measurements.• Multi-point HFD sensors were installed at different heights of a Norway maple tree (Acer platanoides L.) along its stem axis. Single-point HFD sensors were installed in three small lateral roots of another sample maple. Experimental treatments (branch severing) triggered changes in sap movement in the stem and root sapwood.• The sample trees belong to the group with an integrated transport system ("integrated pipes"), sharing stem space on both sides of the tree to supply two large parts of the crown with water from each root sector. Nevertheless, conducting pathways had their autonomy for axial transport and the pipe model theory describes the vascular system of the studied trees well. Thus, the integration of axial transport in the stem xylem should presumably occur through the cross-grained network of axial vessels. Mots-clés :Acer platanoides / distribution du flux / méthode de déformation du champ de chaleur / tuyaux intégrés / capteurs multi-points / structure fonctionnelle du xylème de la tige Résumé -Intégration des voies de transport de l'eau dans un érable : réponses du flux de sève à une ablation de branche.• Il est connu depuis longtemps que des modèles sectorisés et intégrés de système vasculaire coexistent chez différentes espèces et même dans un arbre unique, en fonction de son âge et de l'histoire. Cependant, très peu de publications ont examiné la topologie du parcours vasculaire entre les racines et les branches.• Quelques résultats sur cet aspect important du système vasculaire sont présentés ici. Ils ont été obtenus avec des érables adultes en étudiant directement le mouvement de l'eau dans le xylème de la tige et de la racine avec la méthode de déformation du champ de chaleur (HFD) pour mesurer le flux de sève.• Des capteurs HFD-multi-points ont été installés à différentes hauteurs dans un érable plane (Acer platanoïdes L.) le long de la tige. Des capteurs HFD-simple-point ont été installés dans trois petites racines latérales d'un autre érable. Des traitements expérimentaux (ablation de branche) ont déclen-ché des changements dans la circulation de la sève dans l'aubier de la tige et de la racine.• Les arbres échantillonnés présentent un système vasculaire intégré (« tuyaux intégrés »), avec un tronc partagé en deux secteurs alimentant les deux grandes parties de la couron...

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Seasonal variation of water uptake of a Quercus suber tree in Central Portugal

Cited by 63 publications

References 48 publications

An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem

An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem

Transpiration and stomatal conductance of mistletoe (Loranthus europaeus) and its host plant, downy oak (Quercus pubescens)

Intégration des voies de transport de l’eau dans un érable : réponses du flux de sève à une ablation de branche

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