Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Discussion papers
https://doi.org/10.5194/bg-2018-528
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2018-528
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 Jan 2019

Research article | 14 Jan 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation

Liudmila S. Shirokova1,2, Artem V. Chupakov2, Svetlana A. Zabelina2, Natalia V. Neverova2, Dahedrey Payandi-Rolland1, Carole Causseraund1, Jan Karlsson3, and Oleg S. Pokrovsky1,4 Liudmila S. Shirokova et al.
  • 1Geoscience and Environment Toulouse, UMR 5563 CNRS, University of Toulouse, 14 Avenue Edouard Belin, Toulouse 31400, France
  • 2Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab Severnoi Dviny 23, Arkhangelsk 163000, Russia
  • 3Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science, Umeå University, 901 87 Umeå, Sweden
  • 4BIO-GEO-CLIM Laboratory, Tomsk State University, 35 Lenina Pr., Tomsk 634050, Russia

Abstract. Bio- and photo-degradation of dissolved organic matter (DOM) is identified as dominant vector of C cycle in boreal and high-latitude surface waters. In contrast to large number of studies of humic waters from permafrost-free regions and oligotrophic waters from permafrost-bearing regions, the bio- and photo-lability of DOM from humic surface waters of permafrost-bearing regions has not been thoroughly evaluated. Following standardized methods, we measured biodegradation (low, intermediate, high temperature) and photodegradation (one intermediate temperature) of DOM in surface waters along the hydrological continuum (depression → stream → thermokarst lake → river Pechora) within a European Russian frozen peatland. In all systems, there was no measurable (≥ 10 %) bio- or photodegradation of DOM over 1 month of incubation. It is possible that the main cause of the lack of degradation is the dominance of allochthonous refractory (soil, peat) DOM in all studied waters. Yet, all surface waters were supersaturated with CO2. Thus, this study suggest that, rather than bio- and photo-degradation of DOM in the water column, other factors such as peat porewater DOM processing and respiration of sediments are the main drivers of elevated pCO2 and emission in humic boreal waters of frozen peat bogs.

Liudmila S. Shirokova et al.
Interactive discussion
Status: open (until 28 Feb 2019)
Status: open (until 28 Feb 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Liudmila S. Shirokova et al.
Liudmila S. Shirokova et al.
Viewed  
Total article views: 216 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
172 42 2 216 9 0 2
  • HTML: 172
  • PDF: 42
  • XML: 2
  • Total: 216
  • Supplement: 9
  • BibTeX: 0
  • EndNote: 2
Views and downloads (calculated since 14 Jan 2019)
Cumulative views and downloads (calculated since 14 Jan 2019)
Viewed (geographical distribution)  
Total article views: 106 (including HTML, PDF, and XML) Thereof 106 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 17 Feb 2019
Publications Copernicus
Download
Short summary
Regardless of size and landscape context of surface water in frozen peatland region on NE Europe, the bio- and photo-degradability of dissolved organic matter (DOM) over a month of incubation across a range of temperatures was below 10 %. We challenged the paradigm of dominance of photolysis and biodegradation in DOM processing in surface waters from frozen peatlands and we hypothesize the peat porewater DOM degradation and respiration of sediments as main drivers of CO2 emission in this region.
Regardless of size and landscape context of surface water in frozen peatland region on NE...
Citation