The СÐ.sub.2 Emission during Laboratory Freezing-Thawing of Soils from Various Natural Zones of Russia
Short-term freezing of the soil surface can occur practically throughout the entire territory of Russia. This phenomenon stimulates CO.sub.2 emission from the soil. In this regard, in laboratory conditions, we studied the dynamics of CO.sub.2 emission from soils of various natural zones with periodi...
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Veröffentlicht in: | Eurasian soil science 2021-08, Vol.54 (8), p.1196 |
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Sprache: | eng |
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Zusammenfassung: | Short-term freezing of the soil surface can occur practically throughout the entire territory of Russia. This phenomenon stimulates CO.sub.2 emission from the soil. In this regard, in laboratory conditions, we studied the dynamics of CO.sub.2 emission from soils of various natural zones with periodically repeating short-term freeze-thaw cycles. For the study, samples were taken from the upper horizons of the following soils: Reductaquic Turbic Cryosol (Loamic), Reductaquic Turbic Cryosol (Loamic), Spodic Turbic Cryosol (Arenic), Histic Cryosol (Glacic), Albic Rustic Podzols (Arenic), Haplic Luvisol (Loamic, Aric), Haplic Chernozem (Loamic, Pachic), Rendzic Leptosol (Humic), Haplic Chernozem (Siltic), Gypsic Solonetz (Loamic, Columnic), Gypsic Vertisol (Hypereutric), Haplic Kastanozem (Siltic), and Haplic Calcisol (Loamic). It was found that the dynamics of CO.sub.2 emission during the freeze-thaw cycles were similar for all soils. The CO.sub.2 emission from frozen soil samples was reliably determined. Subsequent soil thawing promoted a pulse increase in the CO.sub.2 emission in comparison with that before and after the freeze-thaw cycle regardless of the soil type. Thus, for the first time, it has been shown on a wide range of soils that a significant response of СÐ.sub.2 emission to freeze-thaw of the soil surface can occur in any natural zone. The magnitude of the response depends on the soil properties, primarily on the organic matter content. The influence of single freeze-thaw cycles on the annual CO.sub.2 flux is insignificant. However, frequent freeze-thaw cycles can affect the CO.sub.2 flux both within individual seasons and throughout the year. |
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ISSN: | 1064-2293 |
DOI: | 10.1134/S1064229321080147 |