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Mass Proportion of Microaggregates and Bulk Density in a Brazilian Clayey Oxisol

^a Institut des Sciences de la Terre d'Orléans (ISTO), UMR 6113 CNRS-UO, Université d'Orléans, Géosciences, BP 6759, 45067 Orléans Cedex 2, France
^b IRD, BP 64501, 34394 Montpellier Cedex 5, France
^c EMBRAPA Arroz e Feijão, C.P. 179-CEP 75.375-000 Santo Antônio de Goiás–GO, Brazil
^d EMBRAPA Cerrados, C.P. 08223, 73301-970 Planaltina-DF, Brazil

View larger version (159K): [in a new window]   Fig. 1. Examples of Backscattered Electron Scanning Images (BESI) illustrating soil structural features of soils sampled from native vegetation (NV2) and pasture (PA2, PA3) sites: (a) microaggregates at 1.5 to 1.6 m (NV2), (b) macroaggregates with multiconcave voids at 0.3 to 0.4 m (PA2), and macroaggregates associated with microaggregates at (c) 1.5 to 1.6 m (NV2), and (d) 0.3 to 0.4 m (PA3). Black areas are voids, light gray areas are quartz or oxide grains, and darker gray areas correspond to porous clay. Scale bar: 2 mm.

View larger version (54K): [in a new window]   Fig. 2. Microaggregate size distribution measured on backscattered electron scanning images (BESI) of soil sampled at 1.5- to 1.6-m depth from soil (a) under native vegetation (NV2), and (b) under pasture (PA2). Bars represent standard deviations.

View larger version (40K): [in a new window]   Fig. 3. Soil properties as a function of depth: (a) bulk density, (b) proportion of mass fraction < 0.84 mm, and fraction of (c) clay, (d) silt, and (e) sand content. Bars represent the largest and the smallest values.

View larger version (19K): [in a new window]   Fig. 4. The inverse of bulk density (1/Db) as a function of the mass proportion of soil material < 0.84 mm (<0.84) for all the soils. The solid line is the linear regression of <0.84 against (1/Db).