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Biota and geomorphic processes as key environmental factors controlling soil formation at Elephant Point, Maritime Antarctica

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dc.contributor.authorGonzález-Guzmán, A.
dc.contributor.authorOliva, Marc
dc.contributor.authorSouza-Júnior, V.S.
dc.contributor.authorPérez-Alberti, A.
dc.contributor.authorRuiz-Fernández, J.
dc.contributor.authorOtero, X.L.
dc.date.accessioned2018-12-27T12:10:23Z
dc.date.available2020-01-01T01:30:18Z
dc.date.issued2017
dc.description.abstractWe examined the main soil forming factors affecting the soil composition, soil properties and the associated soilforming processes at Elephant Point, a small ice-free environment in the South Shetland Islands, Maritime Antarctica. For this purpose, we collected twenty soil samples from each of ten different sites distributed along a linear transect running from the coast to the front of the Rotch Dome glacier. The samples were obtained from surface layers (0–10 cm) and at depth (40–50 cm), although collection was limited in the moraine area by the permafrost table. We determined pH, electrical conductivity, size particle distribution, total organic carbon, total nitrogen and total concentrations of Al, Fe, Ca and P, for physical and chemical characterization of the samples. We also analysed the samples to determine the bioavailability of nutrients and Fe, Al and P partitioning and finally examined them by isotopic (δ15N) and X-ray diffraction (XRD) analysis. The results of the analyses revealed two clear geochemical environments corresponding to the two most extensive geomorphological units in this peninsula: moraine and marine terraces. Soils from the moraine were characterized by alkaline reaction and high quantity of minerals with a low degree of crystallinity, whereas soils from the marine terraces showed acid reaction, high concentration of organometallic complexes and a high diversity of phosphate minerals (taranakite, minyulite, struvite, hydroxylapatite and leucophosphite), which seem to be generated by phosphatization of faecal matter deposited by seabirds and seals. Consequently, biota activity is the most relevant soil differentiating factor in the marine terraces, which add organic matter and activate geochemical cycles. On the other hand, geomorphic processes strongly affected by physical weathering processes such as glacial abrasion (by grinding process), frost shattering, and wind abrasion are the main soil-forming factors in moraine. These forces break up the parent material, transform it and translocate the products formed.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGonzalez-Guzman, A., Oliva, M., Souza-Junior, V. S., Perez-Alberti, A., Ruiz-Fernandez, J., & Otero, X. L. (2017). Biota and geomorphic processes as key environmental factors controlling soil formation at Elephant Point, Maritime Antarctica. Geoderma, 300, 32–43. https://doi.org/10.1016/j.geoderma.2017.04.001.pt_PT
dc.identifier.doi10.1016/j.geoderma.2017.04.001pt_PT
dc.identifier.issn0016-7061
dc.identifier.urihttp://hdl.handle.net/10451/36197
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0016706117305098?via%3Dihubpt_PT
dc.subjectMaritime Antarcticapt_PT
dc.subjectPhosphate mineralspt_PT
dc.subjectGlacial abrasionpt_PT
dc.subjectMineralogypt_PT
dc.titleBiota and geomorphic processes as key environmental factors controlling soil formation at Elephant Point, Maritime Antarcticapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage43pt_PT
oaire.citation.startPage32pt_PT
oaire.citation.titleGeodermapt_PT
oaire.citation.volume300pt_PT
person.familyNameOliva
person.givenNameMarc
person.identifier.ciencia-id5510-AC71-085A
person.identifier.orcid0000-0001-6521-6388
person.identifier.ridK-5423-2014
person.identifier.scopus-author-id35225198700
rcaap.rightsembargoedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationd416bf65-77f6-488e-b275-5fbb257df6d4
relation.isAuthorOfPublication.latestForDiscoveryd416bf65-77f6-488e-b275-5fbb257df6d4

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