Počet záznamů: 1
Continuous High-Frequent Measurements of CO2, CH4 and N2O Fluxes in a Riparian Deciduous Forest: The Role of Hot Moments in 2.5 Year Period
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SYSNO ASEP 0544675 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Continuous High-Frequent Measurements of CO2, CH4 and N2O Fluxes in a Riparian Deciduous Forest: The Role of Hot Moments in 2.5 Year Period Tvůrce(i) Mander, Ülo (UEK-B) RID, SAI, ORCID
Krasnova, A. (EE)
Schindler, Thomas (UEK-B) SAI, RID, ORCID
Escuer-Gatius, J. (EE)
Espenberg, M. (EE)
Macháčová, Kateřina (UEK-B) RID, ORCID, SAI
Pärn, J. (EE)
Kasak, K. (EE)
Niinemets, Ü. (EE)
Soosaar, Kaido (UEK-B) SAI, ORCIDCelkový počet autorů 10 Zdroj.dok. AGU Fall Meeting. - : American Geophysical Union, 2020 Poč.str. 1 s. Akce AGU Fall Meeting 2020 Datum konání 01.12.2020 - 17.12.2020 Místo konání online everywhere Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova methane ; nitrous oxide ; carbon dioxide ; alder ; alnus incana ; hemi-boreal forest ; soil ; tree stem ; eddy covariance Obor OECD Plant sciences, botany Institucionální podpora UEK-B - RVO:86652079 Anotace The carbon and nitrogen budgets of temperate riparian forests are sensitive to interannual climatic variability. In turn, riparian
forests are hot spots of greenhouse gas (GHG) fluxes in landscapes. Here we analyse data from the first long-term (Sept.
2017-Dec. 2019) continuous high-frequent study of soil emissions (automated chambers) and ecosystem (eddy-covariance,
EC) fluxes of CO , CH and N O in a 40-year old riparian grey alder forest in Estonia. It is supported by a 1.5-year study of
CH and N O fluxes from tree stems (manual chambers).
Based on EC data, the forest is a sequesterer of CO (-5.6 kg C ha y ) and CH (-0.35 kg C ha y ) and emitter of N O
(0.3 kg N O-N ha y ). Hot moments (Wet: Sept.-Nov. 2017, Dry with Drought Onset: May–July 2018, Freeze–Thaw: Feb.
2019, and Dry Minor: June 2019) play an important role in GHG fluxes. For ecosystem level fluxes of all three gases no hot
moments were observed however, unlike several forests in the area, during the severe heat wave in summer 2018, the riparian
forest continued sequester CO . The Wet period was remarkable due to high CH emissions from stems – almost 100% of
ecosystem (EC) level CH came from stems. Small N O emission from stems was found in the Wet period. In contrast, soil
N O flux was mainly depending on hot moments: about 60% of all emissions came from these periods. Especially, during
Drought Onset when soil water content (SWC) rapidly decreased, average flux reached >150 μg N O-N m h . In this
period, we observed a very clear optimum related to SWC – N O emission peaked at 50% SWC. During the Freeze–Thaw
period, another hot moment of N O, clear correlation was found with near-surface air temperature. Likewise, CH emission
from stems in the Wet period showed an optimum at 75% SWC. Surprisingly, total N O emission from the soil was about 5
times higher than that measured at the ecosystem level. For CH the EC level flux was coherent with the sum of soil and stem
fluxes.Pracoviště Ústav výzkumu globální změny Kontakt Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Rok sběru 2022
Počet záznamů: 1