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Nighttime doesn’t stop N2O and CH4 exchange from riparian forest tree stems with the atmosphere
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SYSNO ASEP 0544628 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title Nighttime doesn’t stop N2O and CH4 exchange from riparian forest tree stems with the atmosphere Author(s) Schindler, Thomas (UEK-B) SAI, RID, ORCID
Macháčová, Kateřina (UEK-B) RID, ORCID, SAI
Mander, Ülo (UEK-B) RID, SAI, ORCID
Soosaar, Kaido (UEK-B) SAI, ORCIDNumber of authors 4 Source Title EGU General Assembly 2020. - on line : European Geosciences Union, 2020 Number of pages 2 s. Action EGU General Assembly 2020 Event date 04.05.2020 - 08.05.2020 VEvent location online Event type WRD Language eng - English Country DE - Germany Keywords methane ; nitrous oxide ; riparian forest ; tree stem ; emission ; flux ; dirunal pattern OECD category Plant sciences, botany R&D Projects GJ17-18112Y GA ČR - Czech Science Foundation (CSF) LO1415 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UEK-B - RVO:86652079 Annotation R iparian forest ecosystems have been considered to be a natural source of nitrous oxide (N2O) and a natural sink of methane (CH4). Wetland trees may also contribute to the greenhouse gas (GHG) exchange by the release of both gases to the atmosphere or uptake therefrom. Knowledge about the short-termed day and night-time distributed GHG exchange of tree stems with the atmosphere is still scarce. We studied stem fluxes in a riparian forest ecosystem aiming to investigate the diurnal pattern and predict the potential influence of solar radiation. The diurnal flux measurements were performed at 40-year-old grey alder (Alnus incana) forest stand in Estonia with 12-hour interval during July-September 2017 and May-September 2018 (n=16). The exchange of N2O and CH4 was measured from 12 trees at profile height up to 5 m (0.1, 0.8, 1.7, 2.5, 5.0 m) using non-steady state stem chamber systems and gas chromatography. Simultaneously, soil fluxes were automatically quantified using a dynamic chamber system (Picarro 2508). Our preliminary results showed N2O and CH4 emissions from alder tree stems during daytime (4.91 ± 0.15 μg m-2 h-1 and 66.38 ± 16.02 μg m-2 h-1, mean ± s.e.) and lower during nighttime (3.65 ± 0.22 μg m-2 h-1 and 51.49 ± 13.83 μg m-2 h-1, mean ± s.e.) at 0.1 m stem height, revealing a likely link to solar-driven physiological tree activity. Further, with increasing stem height, the relation of night to daytime fluxes diminished. However, the day-wise variation, including a minor GHG uptake indicates a fast response to changing micro-spatial environmental conditions like water regime in the soil and temperature. Our study demonstrates the GHG exchange between tree stems and atmosphere occurs both in day- and night-time. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2022
Number of the records: 1