Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 22
Biogeosciences, 13, 6305-6319, 2016
https://doi.org/10.5194/bg-13-6305-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 13, 6305-6319, 2016
https://doi.org/10.5194/bg-13-6305-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 25 Nov 2016

Research article | 25 Nov 2016

Quantifying soil carbon accumulation in Alaskan terrestrial ecosystems during the last 15 000 years

Sirui Wang1, Qianlai Zhuang1,2, and Zicheng Yu3 Sirui Wang et al.
  • 1Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana 47907, USA
  • 2Department of Agronomy, Purdue University, West Lafayette, Indiana 47907, USA
  • 3Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, Pennsylvania 18015, USA

Abstract. Northern high latitudes contain large amounts of soil organic carbon (SOC), of which Alaskan terrestrial ecosystems account for a substantial proportion. In this study, the SOC accumulation in Alaskan terrestrial ecosystems over the last 15000 years was simulated using a process-based biogeochemistry model for both peatland and non-peatland ecosystems. Comparable with the previous estimates of 25–70PgC in peatland and 13–22PgC in non-peatland soils within 1m depth in Alaska using peat-core data, our model estimated a total SOC of 36–63PgC at present, including 27–48PgC in peatland soils and 9–15PgC in non-peatland soils. Current vegetation stored 2.5–3.7PgC in Alaska, with 0.3–0.6PgC in peatlands and 2.2–3.1PgC in non-peatlands. The simulated average rate of peat C accumulation was 2.3TgC yr−1, with a peak value of 5.1TgC yr−1 during the Holocene Thermal Maximum (HTM) in the early Holocene, 4-fold higher than the average rate of 1.4TgC yr−1 over the rest of the Holocene. The SOC accumulation slowed down, or even ceased, during the neoglacial climate cooling after the mid-Holocene, but increased again in the 20th century. The model-estimated peat depths ranged from 1.1 to 2.7m, similar to the field-based estimate of 2.29m for the region. We found that the changes in vegetation and their distributions were the main factors in determining the spatial variations of SOC accumulation during different time periods. Warmer summer temperature and stronger radiation seasonality, along with higher precipitation in the HTM and the 20th century, might have resulted in the extensive peatland expansion and carbon accumulation.

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We used a model to quantify the carbon stock and its changes in terrestrial ecosystems of Alaska during the last 15 000 years. We found that the changes in vegetation distribution due to climate were the key factors in the spatial variations of carbon in different time periods. The warming during 11–9 k years ago characterized by the increased summer temperature and seasonality of radiation, along with the high precipitation, might play an important role in causing the high carbon accumulation.
We used a model to quantify the carbon stock and its changes in terrestrial ecosystems of Alaska...
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