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- W4311487983 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Permafrost ecosystems are limited in nutrients for vegetation development and constrain the biological activity to the active layer. Upon Arctic warming, permafrost degradation exposes large amounts of soil organic carbon (SOC) to decomposition and minerals to weathering, but also releases organic and mineral soil material that may directly influence the soil exchange properties (cation exchange capacity and base saturation). The soil exchange properties are key for nutrient base cation supply (Ca<sup>2+</sup>, K<sup>+</sup>, Mg<sup>2+</sup>) for vegetation growth and development. In this study, we investigate the distribution of soil exchange properties within typical Arctic tundra permafrost soils at Eight Mile Lake (Interior Alaska, USA) because they will dictate the potential reservoir of newly thawed nutrients and thereby influence soil biological activity and vegetation nutrient sources. Our results highlight a difference in the SOC distribution within soil profiles according to the permafrost thaw. The poorly thawed permafrost soils (active layer thickness; ALT ≤ 60 cm) present more organic material in surface (i.e., organic layer thickness; OLT ≥ 40 cm) than the highly thawed permafrost soil (i.e., ALT > 60 cm and OLT < 40 cm). In turn, this difference in SOC distribution directly affects the soil exchange complex properties. However, the low bulk density of organic-rich soil layers leads to much lower CEC density in surface (~9 400 cmol<sub>c</sub> m<sup>-3</sup>) than in the mineral horizons of the active layer (~16 000 cmol<sub>c</sub> m<sup>-3</sup>) and in permafrost soil horizons (~12 000 cmol<sub>c</sub> m<sup>-3</sup>). As a result of the overall increase in CEC density with depth and the overall increase in base saturation with depth (from ~20 % in organic surface to 65 % in permafrost soil horizons), the average total stock in exchangeable base cations (Ca<sup>2+</sup>, K<sup>+</sup>, Mg<sup>2+</sup> and Na<sup>+</sup> in g m<sup>-3</sup>) is more than 2-times higher in the permafrost than in the active layer. More specifically, the stocks in base cations in the upper part of permafrost about to thaw in the following are ~ 860 g m<sup>-3</sup> for Ca<sub>exch</sub>, 45 g m<sup>-3</sup> for K<sub>exch</sub>, 200 g m<sup>-3</sup> for Mg<sub>exch</sub> and 150 g m<sup>-3</sup> for Na<sub>exch</sub>. This first order estimate is a needed step for future ecosystem prediction models to provide constraint on the size of the reservoir in exchangeable nutrients (Ca, K, Mg) about to thaw." @default.
- W4311487983 created "2022-12-26" @default.
- W4311487983 date "2022-12-14" @default.
- W4311487983 modified "2023-10-14" @default.
- W4311487983 title "Comment on essd-2022-240" @default.
- W4311487983 doi "https://doi.org/10.5194/essd-2022-240-rc2" @default.
- W4311487983 hasPublicationYear "2022" @default.
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