The impact of drought on total ozone flux in a mountain Norway spruce forest

0532003 - ÚVGZ 2021 RIV CZ eng J - Journal Article
Agyei, Thomas - Juráň, Stanislav - Ofori-Amanfo, Kojo Kwakye - Šigut, Ladislav - Urban, Otmar - Marek, Michal V.
The impact of drought on total ozone flux in a mountain Norway spruce forest.
Journal of Forest Science. Roč. 66, č. 7 (2020), s. 280-287. ISSN 1212-4834
R&D Projects: GA MŠMT(CZ) EF16_013/0001609; GA MŠMT(CZ) EF16_027/0008137
Research Infrastructure: CzeCOS III - 90123
Institutional support: RVO:86652079
Keywords : volatile organic-compounds * dry deposition * ponderosa pine * climate-change * atmosphere * vegetation * chemistry * exchange * europe * sulfur
OECD category: Forestry
Method of publishing: Open access
https://www.agriculturejournals.cz/web/jfs.htm?type=article&id=129_2019-JFS

In order to understand the impact of summer drought on dry deposition of tropospheric ozone (O-3), we compared severe and mild drought periods of summer 2018 in a mountain Norway spruce forest at Bily Kriz, Beskydy Mts. An eddy covariance technique was applied to measure diurnal courses of the ecosystem O-3 and CO2 fluxes. Low O-3 deposition was recorded in the morning and evening, while the highest CO2 and O-3 fluxes were recorded during the central hours of the day. Total O-3 deposition during severe drought (soil humidity 13%) was significantly higher than the deposition during the mild drought period (soil humidity 19%). Our data indicate that high vapour pressure deficit and low soil humidity during severe drought led to the stomatal closure, while non-stomatal O-3 deposition, associated with chemical reactions of O-3 with NO and volatile organic compounds, are responsible for higher total O-3 deposition during the severe drought period. Therefore, we assume that under severe drought stomatal O-3 uptake decreases but non-stomatal depositions to forest ecosystems substantially increase.
Permanent Link: http://hdl.handle.net/11104/0310612