Spatial heterogeneity and environmental predictors of permafrost region soil organic carbon stocks

2021/02/24 by Umakant Mishra, Gustaf Hugelius, Eitan Shelef +22 · 9 citations
Earth and Planetary Sciences · Environmental Science · #Climate change and permafrost #Cryospheric studies and observations #Peatlands and Wetlands Ecology

paper · pdf · doi:10.1126/sciadv.aaz5236

openalex publication_date 2021/02/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

Large stocks of soil organic carbon (SOC) have accumulated in the Northern Hemisphere permafrost region, but their current amounts and future fate remain uncertain. By analyzing dataset combining >2700 soil profiles with environmental variables in a geospatial framework, we generated spatially explicit estimates of permafrost-region SOC stocks, quantified spatial heterogeneity, and identified key environmental predictors. We estimated that Pg C are stored in the top 3 m of permafrost region soils. The greatest uncertainties occurred in circumpolar toe-slope positions and in flat areas of the Tibetan region. We found that soil wetness index and elevation are the dominant topographic controllers and surface air temperature (circumpolar region) and precipitation (Tibetan region) are significant climatic controllers of SOC stocks. Our results provide first high-resolution geospatial assessment of permafrost region SOC stocks and their relationships with environmental factors, which are crucial for modeling the response of permafrost affected soils to changing climate.

Citations

• Northern Peatlands: Role in the Carbon Cycle and Probable Responses to Climatic Warming

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