Pedogenesis on coastal tablelands area with low range altimetry in Paraíba state.

Small variations of relief may change drainage and runoff and hence promote the formation of sandy surface horizons and hardened subsurface horizons (fragipans and/or duripans) in Coastal Tablelands soils. This study aimed to investigate the pedogenesis on Coastal Tablelands area with low range altimetry in Paraíba state; secondly, we also sought to contribute to the improvement of the Brazilian Soil Classification System (BSCS). Four soil profiles ware described and collected to be submitted to routine physical and chemical analysis, determination of Fe, Al and Si extracted by sulfuric acid digestion, sodium citrate-bicarbonate-dithionite and acid ammonium oxalate, sodium pyrophosphate, and mineralogical analysis in the sand and clay fractions by X-ray diffractometry. Optical density of the oxalate extract (ODOE) was also determined; the results were statistically evaluated using the R software. Microrelief variations conditioning differentiated water flows, along with the sandy texture of the surface horizons (A and E) and the lower coarse sand/fine sand ratio in the subsurface horizon, seem to promote clay accumulation in depth in the Spodosols developed on Coastal Tablelands environments. For this soils, the argilluvic (argissólico) character at the subgroup level of the BSCS should be incorporated. In addition, Al amorphous mineral phases and/or poorly crystalline play an important role in the formation of strongly cemented horizons (duripans) of the Spodosols, as also reported by other authors. Finally, the ODOE showed to be an efficient indicator of soils under podzolization process, being possible its use as a taxonomic criterion for classification of Spodosols by the BSCS.

Bibliographic Details

Main Authors:	SILVA, G. A. da, CAMÊLO, D. de L., CORRÊA, M. M., SOUZA JÚNIOR, V. S. de, RIBEIRO FILHO, M. R., ARAUJO FILHO, J. C. de
Other Authors:	GIVANILDO ALVES DA SILVA, UFRPE; DANILO DE LIMA CAMÊLO, UFES; MARCELO METRI CORRÊA, UFRPE; VALDOMIRO SEVERINO DE SOUZA JÚNIOR, UFRPE; MATEUS ROSAS RIBEIRO FILHO, UFRPE; JOSE COELHO DE ARAUJO FILHO, CNPS.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2019-07-08
Subjects:	Podzólico, Horizonte, Formica podzolica, Kaolinite, Soil horizons,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1110454 https://doi.org/10.1590/1983-21252019v32n219rc
Tags:	Add Tag No Tags, Be the first to tag this record!