| Publikationstyp: | Beitrag in wissenschaftlicher Zeitschrift |
| Art der Begutachtung: | Peer review (Publikation) |
| Titel: | Soil weathering and accumulation rates of oxalate-extractable phases derived from alpine chronosequences of up to 1 Ma in age |
| Autor/-in: | Dahms, Dennis Favilli, Filippo Krebs, Rolf Egli, Markus |
| DOI: | 10.1016/j.geomorph.2012.01.021 |
| Erschienen in: | Geomorphology |
| Band(Heft): | 151-152 |
| Seite(n): | 99 |
| Seiten bis: | 113 |
| Erscheinungsdatum: | Mai-2012 |
| Verlag / Hrsg. Institution: | Elsevier |
| ISSN: | 0169-555X 1872-695X |
| Sprache: | Englisch |
| Fachgebiet (DDC): | 551: Geologie und Hydrologie |
| Zusammenfassung: | In this study we compare newly-developed chemical weathering data with previously published data from soils developed along two chronosequences of glacial deposits in the European Alps and the Rocky Mountains (Wind River Range, USA). By combining these chronosequences, we are able to present a comprehensive dataset that represents a time period of > 1 Ma. We describe weathering trends of important elements using a number of weathering indices (e.g., K + Ca/Ti ratio, the weathering ‘index B’ of Kronberg and Nesbitt (1981) and the open mass transport function). Further, we describe the accumulation of Al, Fe, Si and Mn oxyhydroxides (including partially organic phases) as a function of time, and derive the corresponding accumulation rates. We calculated pedogenetically formed oxyhydroxides using an approach based on immobile elements. Our study represents one of only a few studies that describe rates of soil chemical weathering over a period as long as ~1 Ma. Results show that rates of chemical weathering clearly decrease along the chronosequences with increasing age of the soils. We find weathering rates are nearly four orders of magnitude lower in the 1 Ma-old soils than in the young soils. Our results suggest that the older soils may be reaching a steady state for these chemical properties in their present environments. A power function best explains the measured time-trends of the ‘index B’ and (K + Ca)/Ti) ratios in the soils. The best time-trend model for pedogenic weakly- to poorly crystalline phases and the relative losses/gains (based on the open-system mass transport function) were obtained with an exponential decay model function. In terms of the soil system, the decreases in the accumulation rate of the oxyhydroxides appears to be influenced not only by the factor of time but by climate as well (increased precipitation at higher altitudes slows the decrease in weathering rate over time). Thus, our ~1 Ma chronosequences also become pedogenic gradients since we describe variations in soil properties along biogenic gradients. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/11625 |
| Volltext Version: | Publizierte Version |
| Lizenz (gemäss Verlagsvertrag): | Lizenz gemäss Verlagsvertrag |
| Departement: | Life Sciences und Facility Management |
| Organisationseinheit: | Institut für Umwelt und Natürliche Ressourcen (IUNR) |
| Enthalten in den Sammlungen: | Publikationen Life Sciences und Facility Management |
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Dahms, D., Favilli, F., Krebs, R., & Egli, M. (2012). Soil weathering and accumulation rates of oxalate-extractable phases derived from alpine chronosequences of up to 1 Ma in age. Geomorphology, 151-152, 99–113. https://doi.org/10.1016/j.geomorph.2012.01.021
Dahms, D. et al. (2012) ‘Soil weathering and accumulation rates of oxalate-extractable phases derived from alpine chronosequences of up to 1 Ma in age’, Geomorphology, 151-152, pp. 99–113. Available at: https://doi.org/10.1016/j.geomorph.2012.01.021.
D. Dahms, F. Favilli, R. Krebs, and M. Egli, “Soil weathering and accumulation rates of oxalate-extractable phases derived from alpine chronosequences of up to 1 Ma in age,” Geomorphology, vol. 151-152, pp. 99–113, May 2012, doi: 10.1016/j.geomorph.2012.01.021.
DAHMS, Dennis, Filippo FAVILLI, Rolf KREBS und Markus EGLI, 2012. Soil weathering and accumulation rates of oxalate-extractable phases derived from alpine chronosequences of up to 1 Ma in age. Geomorphology. Mai 2012. Bd. 151-152, S. 99–113. DOI 10.1016/j.geomorph.2012.01.021
Dahms, Dennis, Filippo Favilli, Rolf Krebs, and Markus Egli. 2012. “Soil Weathering and Accumulation Rates of Oxalate-Extractable Phases Derived from Alpine Chronosequences of up to 1 Ma in Age.” Geomorphology 151-152 (May): 99–113. https://doi.org/10.1016/j.geomorph.2012.01.021.
Dahms, Dennis, et al. “Soil Weathering and Accumulation Rates of Oxalate-Extractable Phases Derived from Alpine Chronosequences of up to 1 Ma in Age.” Geomorphology, vol. 151-152, May 2012, pp. 99–113, https://doi.org/10.1016/j.geomorph.2012.01.021.
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