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Carbon accumulation in peatlands of West Siberia over the last 2000 years
Author(s) -
Beilman David W.,
MacDonald Glen M.,
Smith Laurence C.,
Reimer Paula J.
Publication year - 2009
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/2007gb003112
Subject(s) - peat , radiocarbon dating , wetland , holocene , sink (geography) , environmental science , physical geography , carbon sink , climate change , geology , hydrology (agriculture) , ecology , geography , paleontology , oceanography , biology , cartography , geotechnical engineering
We use a network of cores from 77 peatland sites to determine controls on peat C content and peat C accumulation over the last 2000 years (since 2 ka) across Russia's West Siberian Lowland (WSL), the world's largest wetland region. Our results show a significant influence of fossil plant composition on peat C content, with peats dominated by Sphagnum having a lower C content. Radiocarbon‐derived C accumulation since 2 ka at 23 sites is highly variable from site to site, but displays a significant N–S trend of decreasing accumulation at higher latitudes. Northern WSL peatlands show relatively small C accumulation of 7 to 35 kg C m −2 since 2 ka. In contrast, peatlands south of 60°N show larger accumulation of 42 to 88 kg C m −2 . Carbon accumulation since 2 ka varies significantly with modern mean annual air temperature, with maximum C accumulation found between −1 and 0°C. Rates of apparent C accumulation since 2 ka show no significant relationship to long‐term Holocene averages based on total C accumulation. A GIS‐based extrapolation of our site data suggests that a substantial amount (∼40%) of total WSL peat C has accumulated since 2 ka, with much of this accumulation south of 60°N. The large peatlands in the southern WSL may be an important component of the Eurasian terrestrial C sink, and future warming could result in a shift northward in long‐term WSL C sequestration.