Forms of soil organic phosphorus at black earth sites in the Eastern Amazon

• Autor(a) principal: Garcia da Silva, Arlindo
• Data de Publicação: 2017
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista ciência agronômica (Online)
• Texto Completo: http://periodicos.ufc.br/revistacienciaagronomica/article/view/88665
• topic: Sequential fractionation. Anthropogenic soils. Labile phosphorus. Pyrogenic carbon.

Soils containing archaeological black earth (ABE) are formed by the continuous deposition of organic residue,and maintain their high fertility even after years of cultivation. The aim of this study was to characterise and quantify theforms of organic phosphorus in areas of archaeological black earth (ABE), with a view to understanding the dynamics ofthe element and contributing to the development of sustainable practices of land use. Samples of 10 profiles were used fromLatosols, Argisols and Gleysols located in the eastern Amazon with an anthropogenic A-horizon (ABE), using adjacent, nonanthropogenic soils as reference. The samples relative to the A, transitional and B-horizons, were subjected to sequentialfractionation of P in an acid base extraction, and to further physicochemical characterisation. The acid-extracted P fraction inthe A1 and B-horizons predominated over the basic-extractant labile and soluble fractions in all areas, displaying the highestpercentages for the inorganic form. An increase in the labile organic phosphorus content (Pol) was found in the A1-horizon,with a reduction between the A and B-horizons of 97.6%. The amount of total phosphorus (TP) was significantly higher(6,778 mg dm-3) in the A-horizons of the ABE in comparison with the soil in the reference area (168 mg dm-3). Thepredominance of inorganic phosphorus over organic phosphorus was found for the total fraction, while the oppositeoccurred with the labile fractions. Most of the total labile P is therefore accumulated in the organic fractions of the soil,and represents an active means of supplying the nutrient to plants as it mineralises.