Diurnal Tree Stem CH4 and N2O Flux Dynamics from a Riparian Alder Forest

0544514 - ÚVGZ 2022 RIV CH eng J - Journal Article
Schindler, Thomas - Macháčová, Kateřina - Mander, Ülo - Escuer-Gatius, J. - Soosaar, Kaido
Diurnal Tree Stem CH4 and N2O Flux Dynamics from a Riparian Alder Forest.
Forests. Roč. 12, č. 7 (2021), č. článku 863. E-ISSN 1999-4907
R&D Projects: GA MŠMT(CZ) LO1415; GA ČR(CZ) GJ17-18112Y; GA MŠMT(CZ) EF16_019/0000797
Research Infrastructure: CzeCOS III - 90123
Institutional support: RVO:86652079
Keywords : l. moench plantation * methane emissions * nitrous-oxide * biomass production * soil-temperature * nitrification * Alnus incana * day-night pattern * greenhouse gases * hemiboreal forest * radiation * soil fluxes
OECD category: Plant sciences, botany
Impact factor: 3.282, year: 2021
Method of publishing: Open access
https://www.mdpi.com/1999-4907/12/7/863

Tree stems play an important role in forest methane (CH4) and nitrous oxide (N2O) flux dynamics. Our paper aimed to determine the unknown diurnal variability of CH4 and N2O exchange in grey alder tree stems. The gas fluxes in tree stems and adjacent soil were measured using manual static and dynamic chamber systems with gas chromatographic and laser-spectroscopic analysis, respectively. The alder trees were predominant emitters of CH4 and N2O, however, N2O emission from stems was negligible. The soil mainly emitted N2O into the atmosphere and was both a source and sink of CH4, depending on environmental conditions. Neither the tree stems nor the riparian forest soil showed significant differences in their CH4 and N2O fluxes between the daytime and nighttime, independently of the exchange rates. In contrast to several previous studies revealing a diurnal variability of greenhouse gas fluxes from tree stems, our investigation did not show any clear daytime-nighttime differences. On the other hand, we found quite clear seasonal dynamics initiated by changing environmental conditions, such as temperature and soil water conditions and tree physiological activity. Our results imply a transport role of tree stems for soil-produced CH4 and N2O rather than the production of these gases in tree tissues, even though this cannot be excluded.
Permanent Link: http://hdl.handle.net/11104/0321354