Greenhouse gas dynamics in drained peatlands: CH4 and N2O fluxes from tree stems and soil

Ranniku, R.; Schindler, Thomas; Lehtme, E.; Mander, Ülo; Macháčová, Kateřina; Soosaar, Kaido

doi:https://dx.doi.org/https://doi.org/10.5194/egusphere-egu21-15441

Number of the records: 1

Greenhouse gas dynamics in drained peatlands: CH4 and N2O fluxes from tree stems and soil

1.

SYSNO ASEP	0544692
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	Greenhouse gas dynamics in drained peatlands: CH4 and N2O fluxes from tree stems and soil
Author(s)	Ranniku, R. (EE) Schindler, Thomas (UEK-B)_{SAI, RID, ORCID} Lehtme, E. (EE) Mander, Ülo (UEK-B)_{RID, SAI, ORCID} Macháčová, Kateřina (UEK-B)_{RID, ORCID, SAI} Soosaar, Kaido (UEK-B)_{SAI, ORCID}
Number of authors	6
Source Title	EGU General Assembly 2021 (vEGU21: Gather Online). - Göttingen : European Geosciences Union, 2021
Number of pages	1 s.
Action	EGU General Assembly Conference 2021
Event date	19.04.2021 - 30.04.2021
VEvent location	online
Country	DE - Germany
Event type	WRD
Language	eng - English
Country	DE - Germany
Keywords	methane ; nitrous oxide ; tree stem ; forest floor ; soil ; birch ; spruce ; chamber
OECD category	Plant sciences, botany
Institutional support	UEK-B - RVO:86652079
DOI	https://doi.org/10.5194/egusphere-egu21-15441
Annotation	Peatland soils are considered the dominating source of nitrous oxide (N2O) and methane (CH4) to the atmosphere. However, there are high spatio-temporal uncertainties regarding the budgets of these greenhouse gases (GHG) from peatlands due to complex dynamics between the chemical, physical and biological variables occurring in the soil. GHG fluxes from peatland soils are relatively well studied, however, tree stems have received far less attention and are often overlooked in GHG models and assessments. Our ongoing project focuses on measuring GHGs from tree stems and soil in the Agali Birch Forest Research Station in Estonia, representing a drained peatland with Downy Birch (Betula pubescens) and Norway Spruce (Picea abies) trees. Twelve representative sub-sites were selected in the study area. One half consist of an adjacent set of a Birch and a Spruce tree with manual tree stem chambers, plus one automatic dynamic soil chamber. The remaining subsites are set pairs of birch trees and soil chambers. Six birch trees and all six spruce trees have stem chambers installed at 10, 80 and 170 cm above the ground to measure stem fluxes' vertical profile. Chambers on the six remaining birch trees were only installed at the lowest height. During the weekly sampling campaigns that started in October 2020, we use manual static gas extraction from rigid stem chambers to analyse hourly changes in chamber headspace gas concentrations using gas chromatography. Automated soil chambers collect CH4 and N2O flux data every two hours per chamber using a Picarro analyser. When extrapolated, our results can help understand stem and soil GHG emissions on an ecosystem level and acknowledge the role of tree stems for local and regional GHG budgets. We plan to continue our measurements for one full year to understand the seasonal changes in CH4 and N2O emissions patterns.
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