A 1 km resolution soil organic carbon dataset for frozen ground in the Third Pole
2021
Abstract. Soil organic carbon (SOC) is very important in the vulnerable
ecological environment of the Third Pole; however, data regarding the
spatial distribution of SOC are still scarce and uncertain. Based on
multiple environmental variables and soil profile data from 458 pits (depth
of 0–1 m) and 114 cores (depth of 0–3 m), this study uses a
machine-learning approach to evaluate the SOC storage and spatial
distribution at a depth interval of 0–3 m in the frozen ground area of the
Third Pole region. Our results showed that SOC stocks (SOCSs) exhibited a
decreasing spatial pattern from the southeast towards the northwest. The
estimated SOC storage in the upper 3 m of the soil profile was 46.18 Pg for
an area of 3.27×106 km 2 , which included 21.69 and
24.49 Pg for areas of permafrost and seasonally frozen ground, respectively.
Our results provide information on the storage and patterns of SOCSs at a
1 km resolution for areas of frozen ground in the Third Pole region, thus
providing a scientific basis for future studies pertaining to Earth system
models. The dataset is open-access and available at
https://doi.org/10.5281/zenodo.4293454 (Wang et al., 2020).
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