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• W4206050037 abstract "Abstract Cold ecosystems in regions of high‐latitude and altitude with vast stores of soil organic carbon suffer strong freeze‐thaw cycles, which can greatly affect soil CO 2 release. However, on the Tibetan Plateau, where altitude is >4,000 m, it remains unknown how freeze‐thaw processes regulate CO 2 production across the soil profile. In this study, we used the gradient method to explore impacts of freeze‐thaw processes on depthwise soil CO 2 production in an alpine steppe. We found almost all soil CO 2 was produced in the root‐zone layer (<30 cm), while the root‐free layer (>30 cm) frequently alternated between being a source and sink of CO 2 and thus acted largely as a buffer. The surface layer (0–15 cm) and subsurface layer (15–30 cm) had a similar CO 2 production rate in the thawed period. However, during the freezing‐frozen‐thawing period, the subsurface layer consistently functioned as a weak CO 2 source, although parts were trapped in frozen soil, resulting in a weaker CO 2 sink in the surface layer. Soil CO 2 production in subsurface layer is thus more sensitive to temperature variability compared with surface layer. Furthermore, our results suggest water content plays a more important role than temperature in regulating soil CO 2 production. For the first time, our data set reveals the vertical production of CO 2 within the seasonally frozen soils on the Tibetan Plateau, which will benefit understanding of belowground carbon processes and modeling of soil CO 2 release in the region." @default.
• W4206050037 created "2022-01-25" @default.
• W4206050037 creator A5032828615 @default.
• W4206050037 creator A5032898271 @default.
• W4206050037 creator A5048440698 @default.
• W4206050037 creator A5070895238 @default.
• W4206050037 date "2022-01-01" @default.
• W4206050037 modified "2023-09-26" @default.
• W4206050037 title "Depthwise Soil CO ₂ Production Is Controlled by Freeze‐Thaw Processes in a Tibetan Alpine Steppe" @default.
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• W4206050037 doi "https://doi.org/10.1029/2021jg006678" @default.
• W4206050037 hasPublicationYear "2022" @default.
• W4206050037 type Work @default.
• W4206050037 citedByCount "2" @default.

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