Ozone visible symptoms and reduced root biomass in the subalpine species Pinus uncinata after two years of free-air ozone fumigation

Maria Díaz-De-Quijano, Marcus Schaub, Seraina Bassin, Matthias Volk, Josep Peñuelas

    Research output: Contribution to journalArticleResearchpeer-review

    30 Citations (Scopus)

    Abstract

    Concentrations of ozone often exceed the thresholds of forest protection in the Pyrenees, but the effect of ozone on Pinus uncinata, the dominant species in subalpine forests in this mountainous range, has not yet been studied. We conducted an experiment of free-air ozone fumigation with saplings of P. uncinata fumigated with ambient O 3 (AOT40 May-Oct: 9.2 ppm h), 1.5 × O 3amb (AOT40 May-Oct: 19.2 ppm h), and 1.8 × O 3amb (AOT40 May-Oct: 32.5 ppm h) during two growing seasons. We measured chlorophyll content and fluorescence, visible injury, gas exchange, and above- and below-ground biomass. Increased exposures to ozone led to a higher occurrence and intensity of visible injury from O 3 and a 24-29% reduction of root biomass, which may render trees more susceptible to other stresses such as drought. P. uncinata is thus a species sensitive to O 3, concentrations of which in the Pyrenees are already likely affecting this species. © 2012 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)250-257
    JournalEnvironmental Pollution
    Volume169
    DOIs
    Publication statusPublished - 1 Oct 2012

    Keywords

    • Ozone
    • Pinus uncinata
    • Pyrenees
    • Root biomass
    • Visible injury

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