The European MOTTLES project set-up a new-generation network for ozone (O-3) monitoring in 17 plots in France, Italy and Romania. These monitoring stations allowed: (1) estimating the accumulated exposure AOT40 and stomatal O(3)fluxes (PODY) with an hourly threshold of uptake (Y) to represent the detoxification capacity of trees (POD1, with Y = 1 nmol O-3 m(-2) s(-1) per leaf area); and (2) collecting data of forest-response indicators, i.e. crown defoliation and visible foliar O-3-like injury over the time period 2017-2019. The soil water content was the most important parameter affecting crown defoliation and was a key factor affecting the severity of visible foliar O-3-like injury on the dominant tree species in a plot. The soil water content is thus an essential parameter in the PODY estimation, particularly for water-limited environments. An assessment based on stomatal flux-based standard and on real plant symptoms is more appropriated than the exposure-based method for protecting vegetation. From flux-effect relationships, we derived flux-based critical levels (CLef) for forest protection against visible foliar O-3-like injury. We recommend CLef of 5 and 12 mmol m(-2)POD1 for broadleaved species and conifers, respectively. Before using PODY as legislative standard in Europe, we recommend using the CLec for >= 25% of crown defoliation in a plot: 17,000 and 19,000 nmol mol(-1)h AOT40 for conifers and broadleaved species, respectively.

Epidemiological derivation of flux-based critical levels for visible ozone injury in European forests / Pierre Sicard; Alessandra De Marco; Elisa Carrari; Laurence Dalstein-Richier; Yasutomo Hoshika; Ovidiu Badea; Diana Pitar; Silvano Fares; Adriano Conte; Ionel Popa; Elena Paoletti. - In: JOURNAL OF FORESTRY RESEARCH. - ISSN 1007-662X. - ELETTRONICO. - 31:(2020), pp. 1509-1519. [10.1007/s11676-020-01191-x]

Epidemiological derivation of flux-based critical levels for visible ozone injury in European forests

Elisa Carrari;
2020

Abstract

The European MOTTLES project set-up a new-generation network for ozone (O-3) monitoring in 17 plots in France, Italy and Romania. These monitoring stations allowed: (1) estimating the accumulated exposure AOT40 and stomatal O(3)fluxes (PODY) with an hourly threshold of uptake (Y) to represent the detoxification capacity of trees (POD1, with Y = 1 nmol O-3 m(-2) s(-1) per leaf area); and (2) collecting data of forest-response indicators, i.e. crown defoliation and visible foliar O-3-like injury over the time period 2017-2019. The soil water content was the most important parameter affecting crown defoliation and was a key factor affecting the severity of visible foliar O-3-like injury on the dominant tree species in a plot. The soil water content is thus an essential parameter in the PODY estimation, particularly for water-limited environments. An assessment based on stomatal flux-based standard and on real plant symptoms is more appropriated than the exposure-based method for protecting vegetation. From flux-effect relationships, we derived flux-based critical levels (CLef) for forest protection against visible foliar O-3-like injury. We recommend CLef of 5 and 12 mmol m(-2)POD1 for broadleaved species and conifers, respectively. Before using PODY as legislative standard in Europe, we recommend using the CLec for >= 25% of crown defoliation in a plot: 17,000 and 19,000 nmol mol(-1)h AOT40 for conifers and broadleaved species, respectively.
31
1509
1519
Goal 13: Climate action
Goal 15: Life on land
Pierre Sicard; Alessandra De Marco; Elisa Carrari; Laurence Dalstein-Richier; Yasutomo Hoshika; Ovidiu Badea; Diana Pitar; Silvano Fares; Adriano Conte; Ionel Popa; Elena Paoletti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1282049
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