Menu

Javascript is not activated in your browser. This website needs javascript activated to work properly.
You are here

Tundra landscape heterogeneity, not interannual variability, controls the decadal regional carbon balance in the Western Russian Arctic

Author:
  • Claire C. Treat
  • Maija E. Marushchak
  • Carolina Voigt
  • Yu Zhang
  • Zeli Tan
  • Qianlai Zhuang
  • Tarmo A. Virtanen
  • Aleksi Räsänen
  • Christina Biasi
  • Gustaf Hugelius
  • Dmitry Kaverin
  • Paul A. Miller
  • Martin Stendel
  • Vladimir Romanovsky
  • Felix Rivkin
  • Pertti J. Martikainen
  • Narasinha J. Shurpali
Publishing year: 2018
Language: English
Pages: 5188-5204
Publication/Series: Global Change Biology
Volume: 24
Issue: 11
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

Across the Arctic, the net ecosystem carbon (C) balance of tundra ecosystems is highly uncertain due to substantial temporal variability of C fluxes and to landscape heterogeneity. We modeled both carbon dioxide (CO2) and methane (CH4) fluxes for the dominant land cover types in a ~100-km2 sub-Arctic tundra region in northeast European Russia for the period of 2006–2015 using process-based biogeochemical models. Modeled net annual CO2 fluxes ranged from −300 g C m−2 year−1 [net uptake] in a willow fen to 3 g C m−2 year−1 [net source] in dry lichen tundra. Modeled annual CH4 emissions ranged from −0.2 to 22.3 g C m−2 year−1 at a peat plateau site and a willow fen site, respectively. Interannual variability over the decade was relatively small (20%–25%) in comparison with variability among the land cover types (150%). Using high-resolution land cover classification, the region was a net sink of atmospheric CO2 across most land cover types but a net source of CH4 to the atmosphere due to high emissions from permafrost-free fens. Using a lower resolution for land cover classification resulted in a 20%–65% underestimation of regional CH4 flux relative to high-resolution classification and smaller (10%) overestimation of regional CO2 uptake due to the underestimation of wetland area by 60%. The relative fraction of uplands versus wetlands was key to determining the net regional C balance at this and other Arctic tundra sites because wetlands were hot spots for C cycling in Arctic tundra ecosystems.

Keywords

  • Physical Geography
  • ecosystem modeling
  • methane
  • net ecosystem CO exchange
  • peatland
  • permafrost
  • regional carbon balance
  • Russia
  • Tundra

Other

Published
  • ISSN: 1354-1013
E-mail: paul [dot] miller [at] nateko [dot] lu [dot] se

Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

Processing of personal data