Visible ozone-like injury, defoliation, and mortality in two Pinus uncinata stands in the Catalan Pyrenees (NE Spain)
Diaz-de-Quijano, Maria (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Kefauver, Shawn C. (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Ogaya Inurrigarro, Romà (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Vollenweider, Pierre (Swiss Federal Institute for Forest. Snow and Landscape Research)
Ribas Artola, Àngela (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)

Date:	2016
Abstract:	Ozone concentrations in the Pyrenees have exceeded the thresholds for forest protection since 1994. We surveyed the severity of visible O₃ injuries, crown defoliation, and tree mortality of Pinus uncinata, the dominant species in subalpine forests in this mountain range, along two altitudinal and O₃ gradients in the central Catalan Pyrenees and analysed their relationships with the local environmental conditions. The severity of visible O₃ injuries increased with increasing mean annual [O₃] when summer water availability was high (summer precipitation/potential evapotranspiration above 0. 96), whereas higher [O₃] did not produce more visible injuries during drier conditions. Mean crown defoliation and tree mortality ranged between 20. 4-66. 4 and 0. 6-29. 6 %, respectively, depending on the site. Both were positively correlated with the accumulated O₃ exposure during the last 5 years and with variables associated with soil-water availability, which favours greater O₃ uptake by increasing stomatal conductance. The results indicate that O₃ contributed to the crown defoliation and tree mortality, although further research is clearly warranted to determine the contributions of the multiple stress factors to crown defoliation and mortality in P. uncinata stands in the Catalan Pyrenees.
Grants:	European Commission 610028 Ministerio de Economía y Competitividad CGL2013-48074-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Ozone ; Pyrenees ; Pinus uncinata ; Visible ozone injury ; Defoliation ; Mortality
Published in:	European journal of forest research, Vol. 135, Issue 4 (Aug. 2016) , p. 687-696, ISSN 1612-4669

DOI: 10.1007/s10342-016-0964-9

Post-print 22 p, 260.1 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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