Mostrar el registro sencillo del ítem
dc.contributor.author
Rostagno, Cesar Mario
dc.contributor.author
Degorgue, Gabriela
dc.date.available
2019-06-14T15:53:09Z
dc.date.issued
2011-11-24
dc.identifier.citation
Rostagno, Cesar Mario; Degorgue, Gabriela; Desert pavements as indicators of soil erosion on aridic soils in north-east Patagonia (Argentina); Elsevier Science; Geomorphology; 134; 3-4; 24-11-2011; 224-231
dc.identifier.issn
0169-555X
dc.identifier.uri
http://hdl.handle.net/11336/78332
dc.description.abstract
Desert pavements are prominent features of many geomorphic surfaces in arid and semiarid lands. In the semiarid soils of north-eastern Patagonia, gravel cover in the shrub interspace areas of shrub-dominated communities is generally high, and contrast with that of grass-dominated patches where gravel cover is either absent or negligible. In the present study we analyze the relationship between soil erosion and desert pavement formation, in three sites, the upper, middle and lower slope positions of a flank pediment where well-conserved soils served as reference areas. We used the gravel cover and mass, as well as the thickness of the remnant A horizon, as determined by the depth of the Bt horizon of a Xeric Calciargid, as measures of soil erosion. Surface gravel at four cardinal points in respect to mounds associated with shrub-clumps was collected and the depth to the Bt horizon was determined. The mean thickness of the A horizon in the well-conserved soils were 11.3, 10.0 and 13.5cm for the upper, middle and lower slope positions, respectively. For the same positions, the mean coarse fragment contents (>2.0mm) in the 0-10cm depth of the A horizon in the well-conserved soils were 144, 92 and 119gkg-1, and the mean surface gravel mass in the eroded patches were 5.3, 3.1 and 4.7kgm-2. Surface gravel mass and depth of the remnant A horizon gave different estimates of the magnitude of soil erosion in the flank pediment. Thus, the mean/maximum soil loss, as determined by the mean gravel mass on the soil surface for the upper, middle and lower slope positions were, 28.3/68.2, 27.0/63.8 and 31.5/56.4mm, respectively. These figures increased to a mean of 50.0, 52.5 and 82.0mm for the same positions when soil loss was determined as the difference between the thickness of the A horizon of the well-conserved soil and that of the remaining A horizon in eroded patches. The loss of the A horizon by wind and water erosion seems to initiate the change from grass steppe to a stable shrub steppe characterized, in the shrub interspaces, by well-developed desert pavements. The strong correlation between surface gravel mass and the thickness of the remaining A horizon indicates that accelerated soil erosion has played an important role in the formation of desert pavements, and that desert pavements are good indicators of the extent and intensity of the erosion process in the Punta Ninfas area.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Accelerated Soil Erosion
dc.subject
Arid Rangelands
dc.subject
Desert Pavements
dc.subject
Desertification
dc.subject
Shrub Encroachment
dc.subject.classification
Geoquímica y Geofísica
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Desert pavements as indicators of soil erosion on aridic soils in north-east Patagonia (Argentina)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-08T16:47:08Z
dc.journal.volume
134
dc.journal.number
3-4
dc.journal.pagination
224-231
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.conicet.avisoEditorial
Acceso abierto en el enlace propuesto
dc.description.fil
Fil: Rostagno, Cesar Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
dc.description.fil
Fil: Degorgue, Gabriela. Instituto de Cooperación Económica Internacional; Argentina
dc.journal.title
Geomorphology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.geomorph.2011.06.031
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169555X11003424
Archivos asociados