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Al-/Fe(hydr)oxides accumulation upon weathering favors soil organic carbon (SOC) protection into mineral-organic associations (MOAs). Paradoxically, tropical ecosystems on highly weathered soils are characterized by high turnover rates of SOC. Our objective was to propose an explanation for such apparent contradiction by inferring the chemical composition of MOAs in Oxisols. To this end, we compiled...
Usnea sp. formations show a spatial distribution coinciding with wind-exposed locations on rock knobs or sedimentary bodies, while they are commonly absent from concave sites. Field collection of georeferenced ground truthing data in the Meseta Norte (Fildes Peninsula, Maritime Antarctica) and the application of supervised classification techniques over a summer high resolution QuickBird satellite...
Little information on P fractions and P lability exists for Brazilian semi-arid soils, particularly those under native vegetation. Soil P fractions were determined by a sequential extraction procedure for semi-arid Latosols and Luvisols under native vegetation for representative toposequences from Pernambuco. The P fractions, in order of decreasing lability, were: resin extracted inorganic P (resin-Pi),...
The ''Terra Preta de Indio'' (Indian black earth) or Terra Preta of Western Amazonia is a thick, dark-coloured, anthropic epipedon, usually rich in nutrients. It occurs mostly at the fringes of the Terra Firme, along the Amazon river banks, overlying deep strongly weathered soils. We studied selected chemical, physical and mineralogical properties of seven soils, ranging from the Tertiary Plateau...
A toposequence of soils with columnar structure in the Paricarana catchment (Roraima State, north Amazonia) was studied. The soils occur within the driest part of tropical Amazonia. The two soils in the lower positions are magnesic, as well as sodic, displaying columnar structural peds. The upper slope position is calcium-saturated, associated with dry forest, whilst the the Mg/Na affected soils are...
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