Preprints
https://doi.org/10.5194/bg-2021-211
https://doi.org/10.5194/bg-2021-211

  17 Aug 2021

17 Aug 2021

Review status: this preprint is currently under review for the journal BG.

Dissolved organic carbon vertical movement and carbon accumulation in West Siberian peatlands

Evgeny A. Zarov1, Elena D. Lapshina1, Iris Kuhlmann2, and Ernst-Detlef Schulze2 Evgeny A. Zarov et al.
  • 1UNESCO chair «Environmental dynamic and global climate changes», Yugra State University, Khanty-Mansiysk, 628012, Russian Federation
  • 2Max Planck Institute for Biogeochemistry, P.O. Box 100164, 07701 Jena, Germany

Abstract. Dissolved organic carbon is an additional path of carbon cycle but there is a lack of information about its distribution in peatland and rates of downward movement. We dated seven peat cores (separately the dissolved (DOC) and particulate (POC) organic carbon) from Mukhrino peatland (typical zonal oligotrophic bog) in western Siberia to assess the date distribution between those two peat fractions. Our results revealed that the DOC is younger than POC for the surface peatland layers (0–150 cm) and older for the deeper layers. The date differences increases with depth and reaches 2000–3000 years at the bottom layer (430–530 cm). In our hypothesis this date discrepancy caused by more young DOC moving to the deeper and older peat layers. The estimated average value of DOC downward movement was 0.047 ± 0.019 cm yr−1.

Th oldest dates found at the lake bottom and ancient riverbed were 10 053 and 10 989 cal yr BP correspondingly. For the whole period of peatland functioning the average peat accumulation rate was estimated as 0.067 ± 0.018 cm yr−1 (0.013–0.332 cm yr−1), the carbon accumulation rate was estimated as 38.56 ± 12.21 g С m−2 yr−1 (28.46–57.91 g С m−2 yr−1).

Evgeny A. Zarov et al.

Status: open (until 07 Oct 2021)

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Evgeny A. Zarov et al.

Evgeny A. Zarov et al.

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Short summary
The waterlogging process started ~11 000 years ago at the Mukhrino peatland (Russia, western Siberia). Since that time the peat accumulation has been started with the average rate 0.67 mm per year. The highest carbon accumulation rate found for bottom layers formed by shrubs and tress (63.0–76.0 gC m−2 year−1) and the lowest rate found for the upper layers formed by mosses (34.0 gC m−2 year−1). Dissolved carbon may move downward through the peatland with the average rate 0.047 cm year−1.
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