The effect of ozone on pine forests in South-Eastern France from 2017 to 2019.

Autor: Shashikumar, Anumol, Bičárová, Svetlana, Laurence, Dalstein-Richier
Zdroj: Journal of Forestry Research (1007662X); Apr2023, Vol. 34 Issue 2, p301-315, 15p
Abstrakt: In South-Eastern forests of France, risks linked to the effects of tropospheric ozone (O3) are real; its annual impact has been observed specifically near the coastline and in high altitude mountains during the period 2017 − 2019. In this study, the risk assessment of O3 pollutant was carried out using two approaches based on forest response indicators such as O3 specific foliar visible injury and by stomatal O3 flux. Phytotoxic O3 dose values (POD0) were obtained by the DO3SE model. The model requires hourly O3 concentration for POD0 calculation. A modified approach that uses measurements from passive samplers (monthly average O3 concentration) was tested for the calculation of POD0 and test results showed good agreement with the POD0 calculated using hourly O3 data. In the model input file, the average O3 concentration is used for POD0, and this could be useful for POD0 calculation when the active monitor is limited. In this study, a flux-based assessment provided better correlation with O3 specific leaf injury, which is also species-specific. Foliar visible injury in response to O3 indicates that Pinus cembra and Pinus halepensis are more affected and therefore more sensitive than Pinus sylvestris. The POD0 and stomatal conductance (Gsto) seem to be induced by environmental factors, primarily rainfall and the soil water potential (ƒSWP). The correlation between the O3 flux metric and environmental variables with forest response indicators by Spearman rank test confirms P. cembra as one of the most sensitive species to O3. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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