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Science China Earth Sciences

, Volume 62, Issue 2, pp 349–364 | Cite as

Dissolved organic carbon in permafrost regions: A review

  • Qiang Ma
  • Huijun JinEmail author
  • Congrong Yu
  • Victor F. BenseEmail author
Review
  • 32 Downloads

Abstract

A large quantity of organic carbon (C) is stored in northern and elevational permafrost regions. A portion of this large terrestrial organic C pool will be transferred by water into soil solution (~0.4 Pg C yr−1) (1 Pg=1015 g), rivers (~0.06 Pg C yr−1), wetlands, lakes, and oceans. The lateral transport of dissolved organic carbon (DOC) is the primary pathway, impacting river biogeochemistry and ecosystems. However, climate warming will substantially alter the lateral C shifts in permafrost regions. Vegetation, permafrost, precipitation, soil humidity and temperature, and microbial activities, among many other environmental factors, will shift substantially under a warming climate. It remains uncertain as to what extent the lateral C cycle is responding, and will respond, to climate change. This paper reviews recent studies on terrestrial origins of DOC, biodegradability, transfer pathways, and modelling, and on how to forecast of DOC fluxes in permafrost regions under a warming climate, as well as the potential anthropogenic impacts on DOC in permafrost regions. It is concluded that: (1) surface organic layer, permafrost soils, and vegetation leachates are the main DOC sources, with about 4.72 Pg C DOC stored in the topsoil at depths of 0–1 m in permafrost regions; (2) in-stream DOC concentrations vary spatially and temporally to a relatively small extent (1–60 mg C L−1) and annual export varies from 0.1–10 g C m–2 yr–1; (3) biodegradability of DOC from the thawing permafrost can be as high as 71%, with a median at 52%; (4) DOC flux is controlled by multiple factors, mainly including vegetation, soil properties, permafrost occurrence, river discharge and other related environmental factors, and (5) many statistical and process-based models have been developed, but model predictions are inconsistent with observational results largely dependent on the individual watershed characteristics and future discharge trends. Thus, it is still difficult to predict how future lateral C flux will respond to climate change, but changes in the DOC regimes in individual catchments can be predicted with a reasonable reliability. It is advised that sampling protocols and preservation and analysis methods should be standardized, and analytical techniques at molecular scales and numerical modeling on thermokarsting processes should be prioritized.

Keywords

Dissolved organic carbon (DOC) Aquatic ecosystem Carbon biodegradability DOC export Permafrost degradation 

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Notes

Acknowledgements

The authors also would like to express the sincere gratitude to the two unidentified reviewers for their generous efforts in reviewing and improving the manuscript. This work was financially supported by the National Natural Science Foundation of China (Grant No. 41472229), the Chinese Academy of Sciences (CAS) Strategic Priority Research Program (Grant No. XDA20100103), and the CAS Key Research Program of Frontier Sciences (Grant No. QYZDY-SSW-DQC021).

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouChina
  2. 2.College of Resources and Environment University of Chinese Academy of SciencesBeijingChina
  3. 3.School of Civil EngineeringHarbin Institute of TechnologyHarbinChina
  4. 4.State Key Laboratory of Hydrology-Water Resources and Hydraulic EngineeringHohai UniversityNanjingChina
  5. 5.Hydrology and Quantitative Water Management Group, Department of Environmental SciencesWageningen UniversityWageningenThe Netherlands

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