0619039 - ÚVGZ 2026 RIV NL eng J - Journal Article
Juráň, Stanislav - Karl, T. - Ofori-Amanfo, Kojo Kwakye - Šigut, Ladislav - Zavadilová, Ina - Grace, John - Urban, Otmar
Drought shifts ozone deposition pathways in spruce forest from stomatal to non-stomatal flux.
Environmental Pollution. Roč. 372, MAY (2025), č. článku 126081. ISSN 0269-7491. E-ISSN 1873-6424
R&D Projects: GA MŠMT LM2023048; GA MŠMT(CZ) EH22_008/0004635
Institutional support: RVO:86652079
Keywords : Eddy covariance * megan * Ozone flux * Picea abies * Stomatal conductance * Volatile organic compounds
OECD category: Environmental sciences (social aspects to be 5.7)
Impact factor: 7.6, year: 2023 ; AIS: 1.516, rok: 2023
Method of publishing: Open access
Result website:
https://www.sciencedirect.com/science/article/pii/S0269749125004543?via%3DihubDOI: https://doi.org/10.1016/j.envpol.2025.126081

Dry deposition is the primary pathway for tropospheric ozone (O3) removal, with forests playing a critical role. However, environmental stressors such as drought can reduce this removal capacity by limiting stomatal O3 uptake due to stomata closure. Here we test the hypothesis that combined soil and atmospheric drought reduces the O3 sink capacity of forest ecosystems by diminishing stomatal O3 flux. For stomatal O3 flux estimation, we applied a single-layer resistance model, which estimates stomatal O3 flux based on evaporative resistance method complemented by aerodynamic and laminar sublayer resistances calculation. The model was complemented by detailed sap flow monitoring within the forest footprint, to calculate stomatal O3 flux, using long-term eddy covariance measurements of total water vapour and O3 fluxes over four growing seasons (2017–2020), including an unprecedented drought period. The results revealed that non-stomatal O3 flux compensated for the reduction in stomatal flux in a temperate Norway spruce forest at the Bílý Kříž experimental site in the mountainous region of the Czech Republic, Central Europe. Ozone consumption through interactions with volatile organic compounds, quantified by the MEGAN (Model of Emissions of Gases and Aerosols from Nature) model, contributed only marginally to the non-stomatal flux. These findings suggest that surface reactions, where O3 interacts with plant surfaces, cuticular layers, and soil particles, likely constitute a dominant non-stomatal O3 sink during drought. To our knowledge, this is the first report of severe drought influencing O3 fluxes in temperate mountainous regions, which were previously considered less affected by drought stress.
Permanent Link: https://hdl.handle.net/11104/0365809


 
Scientific data in ASEP :
Soubor primárnich dat k publikaci. Drought Shifts Ozone Deposition Pathways in Spruce Forest from Stomatal to Non-Stomatal Flux