Biologically meaningful and cost-effective indicators are needed for assessing and monitoring the impacts of tropospheric ozone (O-3) on vegetation and are required in Europe by the National Emission Ceilings Directive (2016). However, a clear understanding on the best suited indicators is missing. The MOTTLES (MOnitoring ozone injury for seTTing new critical LEvelS) project set up a new generation network for O-3 monitoring in forest plots in order to: 1) estimate the stomatal O-3 fluxes (Phytotoxic Ozone Dose above a threshold Y of uptake, PODY); and 2) collect visible foliar O-3 injury, both within the forest plot (ITP) and along the Light Exposed Sampling Site (LESS) along the forest edge. Nine forest sites at high O-3 risk were selected across Italy over 2017 - 2019 and significant correlations (p < 0.05) were found between the percentage of symptomatic plant species within the LESS, and POD1 (PODY, with Y = 1 nmol O-3 m(-2) s(-1)) calculated for mixed forest species (r = 0.53) and with the occurrence and severity of visible foliar O-3 injury on the dominant species in the plots (r = 0.65). A generic flux-based critical level for mixed forest species was derived within the LESS and it was recommended using 11 mmol m(-2) POD1 as the critical level for forest protection against O-3 injury, similar to the critical level obtained in the ITP (12 mmol m(-2) POD1). It was concluded that the frequency of symptomatic plant species within a LESS is a suitable and effective plant-response indicator of phytotoxic O-3 levels in forest monitoring. LESS is a non-destructive, less complex and less time-consuming approach compared to the ITP for monitoring foliar O-3 injury in the long term. Assessing visible foliar O-3 injury in the ITP might only underestimate the O-3 risk assessment at individual sites. These results are biologically meaningful and useful to monitoring experts and environmental policy makers.

Testing visible ozone injury within a Light Exposed Sampling Site as a proxy for ozone risk assessment for European forests / Pierre Sicard; Yasutomo Hoshika; Elisa Carrari; Alessandra De Marco; Elena Paoletti. - In: JOURNAL OF FORESTRY RESEARCH. - ISSN 1007-662X. - ELETTRONICO. - 32:(2021), pp. 1351-1359. [10.1007/s11676-021-01327-7]

Testing visible ozone injury within a Light Exposed Sampling Site as a proxy for ozone risk assessment for European forests

Elisa Carrari;
2021

Abstract

Biologically meaningful and cost-effective indicators are needed for assessing and monitoring the impacts of tropospheric ozone (O-3) on vegetation and are required in Europe by the National Emission Ceilings Directive (2016). However, a clear understanding on the best suited indicators is missing. The MOTTLES (MOnitoring ozone injury for seTTing new critical LEvelS) project set up a new generation network for O-3 monitoring in forest plots in order to: 1) estimate the stomatal O-3 fluxes (Phytotoxic Ozone Dose above a threshold Y of uptake, PODY); and 2) collect visible foliar O-3 injury, both within the forest plot (ITP) and along the Light Exposed Sampling Site (LESS) along the forest edge. Nine forest sites at high O-3 risk were selected across Italy over 2017 - 2019 and significant correlations (p < 0.05) were found between the percentage of symptomatic plant species within the LESS, and POD1 (PODY, with Y = 1 nmol O-3 m(-2) s(-1)) calculated for mixed forest species (r = 0.53) and with the occurrence and severity of visible foliar O-3 injury on the dominant species in the plots (r = 0.65). A generic flux-based critical level for mixed forest species was derived within the LESS and it was recommended using 11 mmol m(-2) POD1 as the critical level for forest protection against O-3 injury, similar to the critical level obtained in the ITP (12 mmol m(-2) POD1). It was concluded that the frequency of symptomatic plant species within a LESS is a suitable and effective plant-response indicator of phytotoxic O-3 levels in forest monitoring. LESS is a non-destructive, less complex and less time-consuming approach compared to the ITP for monitoring foliar O-3 injury in the long term. Assessing visible foliar O-3 injury in the ITP might only underestimate the O-3 risk assessment at individual sites. These results are biologically meaningful and useful to monitoring experts and environmental policy makers.
32
1351
1359
Pierre Sicard; Yasutomo Hoshika; Elisa Carrari; Alessandra De Marco; Elena Paoletti
File in questo prodotto:
File Dimensione Formato  
Sicard et al. 2021_JForRes.pdf

accesso aperto

Tipologia: Pdf editoriale (Version of record)
Licenza: DRM non definito
Dimensione 1.02 MB
Formato Adobe PDF
1.02 MB Adobe PDF Visualizza/Apri

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1282046
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 6
social impact