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Publication details

Document type
Journal articles

Document subtype
Full paper

Title
Water-use strategies in two co-occurring Mediterranean evergreen oaks: surviving the summer drought

Participants in the publication
T. S. David (Author)
M. O. Henriques (Author)
C. Kurz-Besson (Author)
INSTITUTO SUPERIOR DE AGRONOMIA
 UNIVERSIDADE DE LISBOA
 J. Nunes (Author)
F. Valente (Author)
M. Vaz (Author)
J. S. Pereira (Author)
R. Siegwolf (Author)
M. M. Chaves (Author)
L. C. Gazarini (Author)
J. S. David (Author)

Summary
In the Mediterranean evergreen oak woodlands of southern Portugal, the main tree species are Quercus ilex ssp. rotundifolia Lam. (holm oak) and Quercus suber L. (cork oak). We studied a savannah-type woodland where these species coexist, with the aim of better understanding the mechanisms of tree adaptation to seasonal drought. In both species, seasonal variations in transpiration and predawn leaf water potential showed a maximum in spring followed by a decline through the rainless summer and a recovery with autumn rainfall. Although the observed decrease in predawn leaf water potential in summer indicates soil water depletion, trees maintained transpiration rates above 0.7 mm day−1 during the summer drought. By that time, more than 70% of the transpired water was being taken from groundwater sources. The daily fluctuations in soil water content suggest that some root uptake of groundwater was mediated through the upper soil layers by hydraulic lift. During the dry season, Q. ilex maintained higher predawn leaf water potentials, canopy conductances and transpiration rates than Q. suber. The higher water status of Q. ilex was likely associated with their deeper root systems compared with Q. suber. Whole-tree hydraulic conductance and minimum midday leaf water potential were lower in Q. ilex, indicating that Q. ilex was more tolerant to drought than Q. suber. Overall, Q. ilex seemed to have more effective drought avoidance and drought tolerance mechanisms than Q. suber.

Date of Publication
2007-06-01

Where published
Tree Physiology

Publication Identifiers
ISSN - 0829-318X
eISSN - 1758-4469

Publisher
Oxford University Press (OUP)

Volume
27
Number
6

Number of pages
10
Starting page
793
Last page
803

Document Identifiers
DOI - https://doi.org/10.1093/treephys/27.6.793
URL - http://dx.doi.org/10.1093/treephys/27.6.793

Rankings
SCIMAGO Q1 (2018) - 1.396 - Plant Science
SCOPUS Q1 (2017) - 1.387 - Plant Science
Web Of Science Q1 (2018) - 3.477 - FORESTRY - SCIE


Export

APA
T. S. David, M. O. Henriques, C. Kurz-Besson, J. Nunes, F. Valente, M. Vaz, J. S. Pereira, R. Siegwolf, M. M. Chaves, L. C. Gazarini, J. S. David, (2007). Water-use strategies in two co-occurring Mediterranean evergreen oaks: surviving the summer drought. Tree Physiology, 27, 793-803. ISSN 0829-318X. eISSN 1758-4469. http://dx.doi.org/10.1093/treephys/27.6.793

IEEE
T. S. David, M. O. Henriques, C. Kurz-Besson, J. Nunes, F. Valente, M. Vaz, J. S. Pereira, R. Siegwolf, M. M. Chaves, L. C. Gazarini, J. S. David, "Water-use strategies in two co-occurring Mediterranean evergreen oaks: surviving the summer drought" in Tree Physiology, vol. 27, pp. 793-803, 2007. 10.1093/treephys/27.6.793

BIBTEX
@article{45823, author = {T. S. David and M. O. Henriques and C. Kurz-Besson and J. Nunes and F. Valente and M. Vaz and J. S. Pereira and R. Siegwolf and M. M. Chaves and L. C. Gazarini and J. S. David}, title = {Water-use strategies in two co-occurring Mediterranean evergreen oaks: surviving the summer drought}, journal = {Tree Physiology}, year = 2007, pages = {793-803}, volume = 27 }