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| Titel |
Variations of soil profile characteristics due to varying time spans since ice retreat in the inner Nordfjord, western Norway |
| VerfasserIn |
A. Navas, K. Laute, A. A. Beylich, L. Gaspar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-06-11), S.485-498 |
| Datensatznummer |
250115281
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| Publikation (Nr.) |
 copernicus.org/se-5-485-2014.pdf |
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| Zusammenfassung |
| In the Erdalen and Bødalen drainage basins located in the inner Nordfjord
in western Norway the soils were formed after deglaciation. The climate in
the uppermost valley areas is sub-arctic oceanic, and the lithology consists
of Precambrian granitic orthogneisses on which Leptosols and Regosols are the
most common soils. The Little Ice Age glacier advance affected parts of the
valleys with the maximum glacier extent around AD 1750. In this study five
sites on moraine and colluvium materials were selected to examine main soil
properties, grain size distribution, soil organic carbon and pH to assess if
soil profile characteristics and patterns of fallout radionuclides (FRNs) and
environmental radionuclides (ERNs) are affected by different stages of ice
retreat. The Leptosols on the moraines are shallow, poorly developed and
vegetated with moss and small birches. The two selected profiles show
different radionuclide activities and grain size distribution. The sampled
soils on the colluviums outside the LIA glacier limit became ice-free during
the Preboral. The Regosols present better-developed profiles, thicker organic
horizons and are fully covered by grasses. Activity of 137Cs and
210Pbex concentrate at the topsoil and decrease sharply with
depth. The grain size distribution of these soils also reflects the
difference in geomorphic processes that have affected the colluvium sites.
Significantly lower mass activities of FRNs were found in soils on the
moraines than on colluviums. Variations of ERN activities in the valleys were
related to characteristics of soil mineralogical composition. These results
indicate differences in soil development that are consistent with the age of
ice retreat. In addition, the pattern distribution of 137Cs and
210Pbex activities differs in the soils related to the LIA
glacier limits in the drainage basins. |
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