Počet záznamů: 1
Nighttime doesn’t stop N2O and CH4 exchange from riparian forest tree stems with the atmosphere
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SYSNO ASEP 0544628 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Nighttime doesn’t stop N2O and CH4 exchange from riparian forest tree stems with the atmosphere Tvůrce(i) 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, ORCIDCelkový počet autorů 4 Zdroj.dok. EGU General Assembly 2020. - on line : European Geosciences Union, 2020 Poč.str. 2 s. Akce EGU General Assembly 2020 Datum konání 04.05.2020 - 08.05.2020 Místo konání online Typ akce WRD Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova methane ; nitrous oxide ; riparian forest ; tree stem ; emission ; flux ; dirunal pattern Obor OECD Plant sciences, botany CEP GJ17-18112Y GA ČR - Grantová agentura ČR LO1415 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UEK-B - RVO:86652079 Anotace 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. Pracoviště Ústav výzkumu globální změny Kontakt Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Rok sběru 2022
Počet záznamů: 1