Actions
  • shareshare
  • link
  • cite
  • add
add
Other research product . 2018

Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia

Fuchs, Matthias; Grosse, Guido; Strauss, Jens; Günther, Frank; Grigoriev, Mikhail; Maximov, Georgy M.; Hugelius, Gustaf;
Open Access
English
Published: 27 Sep 2018
Abstract

Ice-rich yedoma-dominated landscapes store considerable amounts of organic carbon (C) and nitrogen (N) and are vulnerable to degradation under climate warming. We investigate the C and N pools in two thermokarst-affected yedoma landscapes – on Sobo-Sise Island and on Bykovsky Peninsula in the north of eastern Siberia. Soil cores up to 3 m depth were collected along geomorphic gradients and analysed for organic C and N contents. A high vertical sampling density in the profiles allowed the calculation of C and N stocks for short soil column intervals and enhanced understanding of within-core parameter variability. Profile-level C and N stocks were scaled to the landscape level based on landform classifications from 5 m resolution, multispectral RapidEye satellite imagery. Mean landscape C and N storage in the first metre of soil for Sobo-Sise Island is estimated to be 20.2 kg C m−2 and 1.8 kg N m−2 and for Bykovsky Peninsula 25.9 kg C m−2 and 2.2 kg N m−2. Radiocarbon dating demonstrates the Holocene age of thermokarst basin deposits but also suggests the presence of thick Holocene-age cover layers which can reach up to 2 m on top of intact yedoma landforms. Reconstructed sedimentation rates of 0.10–0.57 mm yr−1 suggest sustained mineral soil accumulation across all investigated landforms. Both yedoma and thermokarst landforms are characterized by limited accumulation of organic soil layers (peat). We further estimate that an active layer deepening of about 100 cm will increase organic C availability in a seasonally thawed state in the two study areas by ∼ 5.8 Tg (13.2 kg C m−2). Our study demonstrates the importance of increasing the number of C and N storage inventories in ice-rich yedoma and thermokarst environments in order to account for high variability of permafrost and thermokarst environments in pan-permafrost soil C and N pool estimates.

107 references, page 1 of 11

Beermann, F., Teltewskoi, A., Fiencke, C., Pfeiffer, E.-M., and Kutzbach, L.: Stoichiometric analysis of nutrient availability (N, P, K) within soils of polygonal tundra, Biogeochemistry, 122, 211-227, https://doi.org/10.1007/s10533-014-0037-4, 2015.

Bockheim, J. G., Hinkel, K. M., Eisner, W. R., and Dai, X. Y.: Carbon pools and accumulation rates in an age-series of soil in drained thaw-lake basins, Arctic Alaska, Soil Sci. Soc. Am. J., 68, 697-704, 2004.

Boike, J., Kattenstroth, B., Abramova, K., Bornemann, N., Chetverova, A., Fedorova, I., Fröb, K., Grigoriev, M., Grüber, M., Kutzbach, L., Langer, M., Minke, M., Muster, S., Piel, K., Pfeiffer, E.-M., Stoof, G., Westermann, S., Wischnewski, K., Wille, C., and Hubberten, H.-W.: Baseline characteristics of climate, permafrost and land cover from a new permafrost observatory in the Lena River Delta, Siberia (1998-2011), Biogeosciences, 10, 2105-2128, https://doi.org/10.5194/bg-10-2105- 2013, 2013.

Brown, J., Ferrians Jr., J. O., Heginbottom, J. A., and Melnikov, E. S.: Circum-Arctic map of permafrost and ground-ice conditions, 1 : 10 000 000, Map CP-45, United States Geological Survey, International Permafrost Association, 1997.

Dutta, K., Schuur, E. A. G., Neff, J. C., and Zimov, S. A.: Potential carbon release from permafrost soils of Northeastern Siberia, Glob. Change Biol., 12, 2336-2351, https://doi.org/10.1111/j.1365-2486.2006.01259.x, 2006.

Chapin III, F. S., Shaver, G. R., Giblin, A. E., Nadelhoffer, K. J., and Laundre, J. A.: Responses of Arctic tundra to experimental and observed changes in climate, Ecology, 76, 694-711, 1995.

French, H. and Shur, Y.: The principles of cryostratigraphy, Earth-Sci. Rev., 101, 190-206, https://doi.org/10.1016/j.earscirev.2010.04.002, 2010.

Fuchs, M., Kuhry, P., and Hugelius, G.: Low below-ground organic carbon storage in a subarctic Alpine permafrost environment, The Cryosphere, 9, 427-438, https://doi.org/10.5194/tc-9-427- 2015, 2015.

Fuchs, M., Grosse, G., Strauss, J., Günther, F., Grigoriev, M. N., Maximov, G. M., and Hugelius, G.: Sample site characteristics including mean SOC and SN for permafrost cores collected on Sobo-Sise Island and Bykovsky Peninsula, PANGAEA, https:// doi.org/10.1594/PANGAEA.883582, 2017.

Goslar, T., Czernik, J., and Goslar, E.: Low-energy 14C AMS in Poznan Radiocarbon Laboratory, Poland, Nucl. Instrum. Methods B, 223/224, 5-11, https://doi.org/10.1016/j.nimb.2004.04.005, 2004. [OpenAIRE]

Funded by
EC| PETA-CARB
Project
PETA-CARB
Rapid Permafrost Thaw in a Warming Arctic and Impacts on the Soil Organic Carbon Pool
  • Funder: European Commission (EC)
  • Project Code: 338335
  • Funding stream: FP7 | SP2 | ERC
Related to Research communities
European Marine Science
Download from
moresidebar