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Abstract
The classification of Spodosols on the second categorical level (suborder), according to the Brazilian Soil Classification System (SiBCS), is done by observing the colors of genetic horizons in the field. The presence or absence of iron oxides is the main factor for this classification, and the color of the horizon is the criterion currently adopted. However, the simple observation of color in the field can be mistaken and cause an error in the definition of the second categorical level. [...]
Highlights
Podzolization is the process responsible for the formation of spodic horizons, the main pedogenetic process involved with the genesis of Spodosols
The objective of this study was to test a method that involves the calcination of samples of spodic horizons of 12 Spodosol profiles in the northern Santa Catarina Coastal Plain, Brazil, with variation of morphology and classification of B spodic horizons in the field, by eliminating the organic carbon and, based on the evaluation of the resulting color, confirming the presence or absence of Fe; ensuring a more precise classification of Spodosols to the second categorical level used by the SiBCS
The spodic horizons of the profiles P6, P8, P12, P14, P15, and P17 were reclassified to the second categorical level
Summary
Podzolization is the process responsible for the formation of spodic horizons, the main pedogenetic process involved with the genesis of Spodosols This process consists of translocation of organic compounds associated or not with Al and/or Fe, with consequent accumulation of amorph and/or low-crystallinity compounds in the spodic horizons in the subsurface (Lundström et al, 2000; Schaetzl and Anderson, 2005). Most Spodosols developed from sandy sediments of coastal plains have shown that the thick dark spodic horizons are formed by humus accumulation due to lateral fluxes of water These soils occur, in general, in plain areas connected by the water table; the moving of water laterally transports colloidal particles constituted of dissolved organic carbon, which increasingly saturate the pores of the sandy source material in the fluctuation zone of the water table (Vidal-Torrado and Ferreira, 2017)
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