EGU21-8969, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-8969
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Greenhouse gas balance of open peatlands is globally governed by soil water content and archaeal abundance

Sandeep Thayamkottu1, Jaan Pärn1, Mohammad Bahram2,3, Mikk Espenberg1, Leho Tedersoo3,4, Ülo Niinemets5, and Ülo Mander1
Sandeep Thayamkottu et al.
  • 1Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, 51014, Tartu, Estonia
  • 2Department of Ecology, Swedish University of Agricultural Sciences, Ulls väg 16, 756 51, Uppsala, Sweden
  • 3Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, 40 Lai St. Tartu, Estonia
  • 4Natural History Museum, University of Tartu, Vanemuise St. 46, 51014, Tartu, Estonia
  • 5Institute of Agricultural & Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia

There is a general consensus that peatlands are the source of about 10% of the global CO2, CH4 and N2O greenhouse gas (GHG) emissions. Yet, our knowledge about underlying processes and environmental factors that regulate the GHG are limited. Here, we found that the GHG balance of CO2, CH4 and N2O in 48 open peatland sites on five continents can be predicted by a model that incorporates soil water content (SWC) and archaeal abundance. We used our global database (2011–2019) on peat characteristics and field-measured soil respiration (ER), CH4 and N2O emissions. Furthermore, we used the gross primary productivity (GPP) dataset by Running, Mu & Zhao (2015) on the basis of satellite data from the Moderate Resolution Imaging Spectrometer (MODIS) sensors alongside the ER to derive net ecosystem exchange (NEE) of carbon. The GHG balance follows SWC along a bell-shaped curve and increases with archaeal abundance and decomposition rate of peat-forming plant species. Thus, the net GHG emission peaks at intermediate SWC. These factors combined explains 61.9% (adjusted R2 = 0.587) of GHG balance and most of this variance is made up by the NEE of carbon (adjusted R2 = 0.97).

How to cite: Thayamkottu, S., Pärn, J., Bahram, M., Espenberg, M., Tedersoo, L., Niinemets, Ü., and Mander, Ü.: Greenhouse gas balance of open peatlands is globally governed by soil water content and archaeal abundance, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8969, https://doi.org/10.5194/egusphere-egu21-8969, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.