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Forest wildfire and stubble burning practices in agriculture contribute to the formation of black carbon (BC), a continuum of pyrogenic carbon ranging from slightly charred degradable biomass to highly condensed refractory soot. We examined the BC contribution to Andisol after a wildfire in a pristine Araucaria-Nothofagus spp. temperate rain forest and after 17years of stubble burning on an agricultural...
The existing information on soil carbon (C) stabilisation in allophanic soils is conflicting because active Al 3+ and sesquioxides (i.e., the oxides/hydroxides of Al and Fe) as a stabilising agent of soil C are emphasised in opposition to allophane and imogolite type materials. Two hypotheses were tested in this study: 1) Al (and Fe) complexed with soil C and allophane content are the key...
In previous studies, Al extracted by acid ammonium acetate (Al a ) or Na-pyrophosphate (Al p ), rather than silt or clay content and climate conditions, was the most important factor that controls organic matter (OM) levels in volcanic soils. Here, the hypothesis was tested that Al a is a comparable method (as much as CuCl 2 ) to quantify the proportion of Al bound...
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