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Title

Differential impact of the most extreme drought event over the last half century on growth and sap flow in two coexisting Mediterranean trees

Publication Year

2014

Author(s)
  • Forner, Alicia
  • Aranda, Ismael
  • Granier, Andre
  • Valladares, Fernando
Source
PLANT ECOLOGY Volume: 215 Issue: 7 Pages: 703-719 Published: 2014
ISSN
1385-0237 eISSN: 1573-5052
Abstract

Extreme climatic events such as intense droughts are becoming more frequent in Mediterranean regions, but our understanding of their impact on tree performance is still fragmentary. We analyzed growth and sap flow responses for a 3-year period including the most stressful drought over the last half century in the evergreen Pinus nigra and the deciduous Quercus faginea, two dominant tree species in the continental plateau of the Iberian Peninsula. Our aim was to quantify the differential impacts of this event on the performance of both species and their modulation by local microclimate. Growth was registered with digital dendrometers, and water use was assessed by continuously recording sap flow in 8-9 coexisting adult individuals of each species in two sites. Q. faginea spring growth rate decreased by 60 % during the dry year at the dry site, while the decrease in P. nigra was around 36 %. P. nigra exhibited larger sap flow reductions during the dry season and also larger decreases during the extreme year, but in contrast to Q. faginea, it was able to recover growth and sap flow values after the extreme drought. Minor microclimatic differences between sites had significant effects on growth and water use, with slightly more mesic conditions significantly attenuating the impact of drought on both species. Findings suggest that the study species were near to their tolerance thresholds, so that even moderate increases in the intensity and frequency of unusual droughts have important consequences for individual tree performance, and eventually species coexistence and ecosystem processes.

Author Keyword(s)
  • Extreme drought
  • Pinus nigra
  • Quercus faginea
  • Climate change
  • Mediterranean forests
KeyWord(s) Plus
  • WATER-USE EFFICIENCY
  • OAK QUERCUS-PUBESCENS
  • CLIMATE-CHANGE
  • SCOTS PINE
  • HYDRAULIC CONDUCTANCE
  • CANOPY CONDUCTANCE
  • USE STRATEGIES
  • DIE-OFF
  • VEGETATION MORTALITY
  • STAND TRANSPIRATION
ESI Discipline(s)
  • Environment/Ecology
  • Plant & Animal Science
Web of Science Category(ies)
  • Plant Sciences
  • Ecology
  • Forestry
Adress(es)

[Forner, Alicia; Valladares, Fernando] MNCN, CSIC, Dept Biogeog & Cambio Global, Lab Int Cambio Global LINC Global, Madrid 28006, Spain; [Aranda, Ismael] INIA, Forest Res Ctr, Dept Forest Ecol & Genet, Madrid 28040, Spain; [Granier, Andre] INRA, UMR Ecol & Ecophysiol Forestieres 1137, F-54280 Champenoux, France; [Valladares, Fernando] Univ Rey Juan Carlos, Escuela Super Ciencias Expt & Tecnol, Dept Biol & Geol, Mostoles 28933, Spain

Reprint Adress

Forner, A (reprint author), MNCN, CSIC, Dept Biogeog & Cambio Global, Lab Int Cambio Global LINC Global, Serrano 115 Dpdo, Madrid 28006, Spain.

Country(ies)
  • France
  • Spain
CNRS - Adress(es)

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Accession Number
WOS:000340683900004
uid:/G064GP6X
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