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

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, ORCID}
Celkový 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