Sepúlveda Varas, Alejandra; Schuller, Paulina; Walling, Desmond E.; Castillo, Alejandra

Use of 7Be to document soil erosion associated with a short period of extreme rainfall

datacite.alternateIdentifier.citation	Journal of Environmental Radioactivity, Vol. 99, Nº 1, 35-49, 2008	es
datacite.alternateIdentifier.doi	10.1016/j.jenvrad.2007.06.010	es
datacite.creator	Sepúlveda Varas, Alejandra
datacite.creator	Schuller, Paulina
datacite.creator	Walling, Desmond E.
datacite.creator	Castillo, Alejandra
datacite.date	2008-01
datacite.date.issued	2013-05-02
datacite.subject	Cesio-137	es
datacite.subject	Erosión	es
datacite.subject	Precipitación intensa	es
datacite.subject	Cero labranza	es
datacite.subject	Quema de residuos	es
datacite.title	Use of 7Be to document soil erosion associated with a short period of extreme rainfall	es
dc.coverage	Chile	es
dc.date.accessioned	2013-05-02T20:15:49Z
dc.date.available	2013-05-02T20:15:49Z
dc.description.abstract	Intensification and expansion of agricultural production since the 1970s have increased soil erosion problems in south-central Chile. Quantitative information on soil loss is needed for erosion risk assessment and to establish the effectiveness of improved land management practices. Since information from traditional sources, such as erosion plots, is limited, attention has been directed to the use of environmental radionuclides for documenting erosion rates. Cs-137 has been successfully utilised for this purpose, but only provides information on medium-term erosion rates. There is also a need to document event-related soil erosion. This paper outlines the basis for using 7Be measurements to document short-term erosion and reports its successful use for quantifying the erosion that occurred within an arable field, as a result of a period of heavy rainfall (400 mm in 27 days) occurring in May 2005. The study field had been under a no-till, no-burning system for 18 years, but immediately prior to the period of heavy rainfall the harvest residues were burnt. The erosion recorded therefore reflected both the extreme nature of the rainfall and the effects of the burning in increasing surface runoff and erosion. The sampled area corresponded to that used previously by the authors to document the medium-term erosion rates associated with both conventional tillage and the subsequent switch to a no-till system. Comparisons between the erosion documented for the period of heavy rainfall in 2005 with these medium-term erosion rates permits some tentative conclusions regarding the importance of extreme events and the impact of burning in increasing the erosion associated with the no-till system.	es
dc.format	AVI	es
dc.identifier.uri	https://repositoriodigital.uct.cl/handle/10925/1020
dc.language.iso	en	es
dc.publisher	Elservier Science BV	es
dc.source	Journal of Environmental Radioactivity	es
oaire.resourceType	Artículo de Revista	es
oaire.version	posprint	es
uct.carrera	Ingeniería en Recursos Naturales Renovables	es
uct.catalogador	asv	es
uct.comunidad	Recursos Naturales	es
uct.disciplina	Ciencias de los Suelos	es
uct.facultad	Facultad de Recursos Naturales	es
uct.indizacion	ISI	es
uct.unidadacademica	Dirección General de Investigación y Postgrado	es