Metrics of ozone risk assessment for Southern European forests: Canopy moisture content as a potential plant response indicator

A. De Marco, P. Sicard, M. Vitale, G. Carriero, C. Renou, E. Paoletti

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Abstract

Present standards for protecting ecosystems from ozone (O3), such as AOT40, use atmospheric concentrations. A stomatal flux-based approach (Phytotoxic O3Dose, PODY) has been suggested. We compared the spatial and temporal distribution of AOT40 and PODY - with and without a hourly threshold of uptake (POD1 and POD0) - for Pinus halepensis and Fagus sylvatica in South-eastern France and North-western Italy. Ozone uptake was simulated by including limitation due to soil water content, as this is an important parameter in water-limited environments. Both AOT40 and POD1 exceeded the critical levels suggested for forests. AOT40 suggested a larger O3risk relative to PODY. No significant spatial and temporal difference occurred between POD1 and POD0. The use of POD0 in the assessment of ambient O3risk for vegetation is thus recommended, because it is more biologically-meaningful than AOT40 and easier to be calculated than POD1. Canopy Moisture Content (CMC), a proxy of foliar water content, was modelled and tested as a potential plant O3response indicator. CMC response to O3was species-specific, and thus cannot be recommended in the epidemiology of O3injury to forests.
Original languageEnglish
Pages (from-to)182 - 190
Number of pages9
JournalAtmospheric Environment
Volume120
DOIs
Publication statusPublished - 1 Nov 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Atmospheric Science

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