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

dc.coverageChilees
dc.date2008-01
dc.date.accessioned2013-05-02T20:15:49Z
dc.date.available2013-05-02T20:15:49Z
dc.date.issued2013-05-02
dc.description.abstractIntensification 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.description.versionposprintes
dc.formatAVIes
dc.identifier.citationJournal of Environmental Radioactivity, Vol. 99, Nº 1, 35-49, 2008es
dc.identifier.doi10.1016/j.jenvrad.2007.06.010es
dc.identifier.urihttps://hdl.handle.net/10925/1020
dc.language.isoenes
dc.publisherElservier Science BVes
dc.sourceJournal of Environmental Radioactivityes
dc.subjectCesio-137es
dc.subjectErosiónes
dc.subjectPrecipitación intensaes
dc.subjectCero labranzaes
dc.subjectQuema de residuoses
dc.titleUse of 7Be to document soil erosion associated with a short period of extreme rainfalles
dc.typeArtículo de Revistaes
uct.carreraIngeniería en Recursos Naturales Renovableses
uct.catalogadorasves
uct.comunidadRecursos Naturaleses
uct.disciplinaCiencias de los Sueloses
uct.facultadFacultad de Recursos Naturaleses
uct.indizacionISIes
uct.unidadacademicaDirección General de Investigación y Postgradoes
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