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dc.contributor.authorScheffler, Raphael  Concept link
dc.contributor.authorNeill, Christopher  Concept link
dc.contributor.authorKrusche, Alex V.  Concept link
dc.contributor.authorElsenbeer, Helmut  Concept link
dc.date.accessioned2012-03-26T19:43:11Z
dc.date.available2012-03-26T19:43:11Z
dc.date.issued2011-08
dc.identifier.urihttps://hdl.handle.net/1912/5103
dc.descriptionAuthor Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Agriculture, Ecosystems & Environment 144 (2011): 281–289, doi:10.1016/j.agee.2011.08.016.en_US
dc.description.abstractClearing for large-scale soy production and the displacement of cattle-breeding by soybeans are major features of land-use change in the lowland Amazon that can alter hydrologic properties of soils and the runoff generation over large areas. We measured infiltrability and saturated hydraulic conductivity (Ksat) under natural forest, pasture, and soybeans on Oxisols in a region of rapid soybean expansion in Mato Grosso, Brazil. The forest-pasture conversion reduced infiltrability from 1258 to 100 mm/h and Ksat at all depths. The pasture-soy conversion increased infiltrability from 100 to 469 mm/h (attributed to shallow disking), did not affect Ksat at 12.5 cm, but decreased Ksat at 30 cm from 122 to 80 mm/h, suggesting that soybean cultivation enhances subsoil compaction. Permeability decreased markedly with depth under forest, did not change under pasture, and averaged out at one fourth the forest value under soybeans with a similar pattern of anisotropy. Comparisons of permeability with rainfall intensities indicated that land-use change did not alter the predominantly vertical water movement within the soil. We conclude that this landscape is well buffered against land-use changes regarding near-surface hydrology, even though short-lived ponding and perched water tables may occur locally during high-intensity rainfall on pastures and under soybeans.en_US
dc.description.sponsorshipThis research was supported by the US National Science Foundation (NSF) grant DEB-0640661 and the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.relation.urihttps://doi.org/10.1016/j.agee.2011.08.016
dc.subjectLand-cover changeen_US
dc.subjectTropical foresten_US
dc.subjectPastureen_US
dc.subjectInfiltrabilityen_US
dc.subjectSaturated hydraulic conductivity, Ksaten_US
dc.subjectHydrological flowpathsen_US
dc.titleSoil hydraulic response to land-use change associated with the recent soybean expansion at the Amazon agricultural frontieren_US
dc.typePreprinten_US


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