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Descripción
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| Soils of the "Raña" in SW Spain are Acrisols characterized by high OC content, strong acidity and high content of Al3+. The quality of these soils decreased due to traditional tillage so that alternative uses and managements are needed to improve it. The objective of this study was to evaluate the effect of a Ca-amendment and different land uses on the stabilization of OC in soil aggregates. The land uses were natural pasture (NP), improved pasture (IP) and a traditionally tilled forage crop (FC). Samples were taken at 0-5 and 5-15 cm depths and analysed for pH, total organic carbon (TOC), particulate organic carbon (POC), total nitrogen (TN), aggregate-size distribution through wet-sieving, and C and N associated to each aggregate-size class. Amendment did not influence aggregate-size distribution. Tilled forage crop (FC) reduced large macroaggregates (>2mm) and increased microaggregates (250-1000µm) when compared to pastures. While NP increased large macroaggregates on top layer, these were higher in the deeper layer for IP. Small macroaggregates (1-2mm) and fraction <53µm were not affected in any case. The aggregate associated-C was influenced by depth, land use and aggregate size. Improved pasture increased OC on large macroaggregates and fraction <53µm for both layers. The fraction <53µm was the size containing more OC (11.6%) while microaggregates showed the lowest concentration (5.9%) compared with small (6.9%) and large macroaggregates (9.1%). In conclusion, traditional tillage reduced aggregate-size distribution and OC content in the largest and the smallest aggregates while pastures preferentially stored OC in the large macroaggregates. | |
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Internacional
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Si |
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Nombre congreso
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4Th International Congress EUROSOIL 2012 |
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Tipo de participación
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960 |
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Lugar del congreso
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Bari (Italia) |
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Revisores
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Si |
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ISBN o ISSN
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99-9999-999-9 |
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DOI
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Fecha inicio congreso
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02/07/2012 |
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Fecha fin congreso
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06/07/2012 |
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Desde la página
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1755 |
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Hasta la página
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1755 |
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Título de las actas
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Libro de resúmenes del 4Th International Congress EUROSOIL 2012 |