Abstract
ABSTRACT The northwestern part of the Acre State (Brazil) possesses singular soils in Brazilian Amazonia, but have been very little studied. This study aimed to discuss the genesis and some micropedological aspects of the soils from Serra do Divisor and adjacent floodplain soils of the Moa river, to enhance the knowledge on their formation. A toposequence of soils ranging from the uppermost part of sub-Andean Serra do Divisor to the Alluvial soils of Moa river floodplain was studied, regarding chemical, [...]
Highlights
The northwestern of the Acre State (Brazil) possesses unique, poorly studied pedoenvironments in the Brazilian Amazonia
All soils studied at Serra do Divisor are sandy with high amounts of coarse and fine sand and less than % of clay and % of silt (Table 3), being derived from Cretaceous weathered sandstone
Our findings show nutrient-poor, dystrophic soils, with very low cation exchange capacity (CEC), high Al saturation, and low pH values on Serra do Divisor, which in agreement with previous results for other sandy soils studied in the Amazon (Lucas et al, 1993; Mafra et al, 2002; Gomes et al, 2007; Nascimento et al, 2008; Fritsch et al, 2009)
Summary
The northwestern of the Acre State (Brazil) possesses unique, poorly studied pedoenvironments in the Brazilian Amazonia. The main physiographic feature in this region is the Serra do Divisor mountain range, reaching 700 m a.s.l., consisting predominantly of Cretaceous sandstones (Moura and Wanderley, 1938; Carvalho et al, 1977). The Amazonian tropical rainforest is the main vegetation type of this region, developing on sandy soils under an equatorial climatic regime. The combination of humid tropical conditions and a sandy, nutrient-poor substrates could favor the development of illuviation process leading to organic subsurface layers and podzolization, with downward migration of Al/Fe compounds, complexed by organic matter, and subsequent accumulation of amorphous constituent, forming spodic horizon (Lundström et al, 2000; Schaetzl and Anderson, 2005; Soil Survey Staff, 2014a)
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