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Original Articles

Climatic Influence on Morphology and Chemistry of Nine Loess-Profiles, Argentine

Pages 16-24 | Published online: 10 Apr 2013
 

Abstract

Frcdcriksen, Peter: Climatic influence on morphology and chemistry of nine loess profiles, Argentine. Geografisk Tiddskrift 81:16–24. Copenhagen, October, 1981.

Nine profiles developed in loess under a subtropical, continental climate with a pronounced climatic gradient (udic to aridicj were investigated morphologically and chemically in order to elucidate the influence of climate on soil genesis. Four morphological types developed: a) A1A2BtC-soils, b) ABC-soils, c) A(B)C-soils and d) AC-soils. Some variations could be related to the climatic variation, others were better related to texture or to palaeoclimatic (periglacial) conditions.

DANSK RESUME

Ni profiler udviklet i løss under et subtropisk til tropisk kontinentalt klima med kraftige svingninger i nedbør på årsog årstidsbasis samt en kraftig klimatisk gradient blev undersøgt morfologisk og kemisk, for at undersoge hvilken indflydelse klimaet har på jordbundsdannelsen. Som folge af den klimatiske gradient udvikledes fire morfologiske hoved- typer: 1) A1 A2BtC-jorde, 2) ABC-jorde, 3) A(B)C-jorde og 4) AC-jorde, som fandtes i besternte klimaintervaller. Variation i horisonttyype og tykkelse, tykkelse af solum og A1 samt farveudviklingen, basemætningsgrad, humusindhold og fordeling og C/N forhold kunne henføres til processer som nedslemning af ler, humus og jern, udvaskning af Ca, Mg, K og Na, bioturbation, pløjning, cementering (fragipandan- nelse), humusdannelse og strukturdannelse, som igen var helt eller delvis relateret til klimaet. Strukturvariationen, pH og cementeringen skyldtes ikke den klimatiske gradient men andre faktorer.

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