Floresta e Ambiente (Feb 2022)

Organic Matter in Soils with Anthropic Horizons in The Eastern Amazon, Pará (Brazil)

  • Melania Merlo Ziviani,
  • Iolanda Maria Soares Reis,
  • Orlando Carlos Huertas Tavares,
  • Eudocio Rafael Otavio Silva,
  • Otavio Augusto Queiroz dos Santos,
  • Luiz Alberto da Silva Rodrigues Pinto,
  • Marcos Gervasio Pereira

DOI
https://doi.org/10.1590/2179-8087-floram-2021-0091
Journal volume & issue
Vol. 29, no. 1

Abstract

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Abstract The aim of this study was to evaluate the distribution of chemical and physical fractions of soil organic matter (SOM) in anthropic horizons of soil profiles in the west of Pará. The highest total organic carbon values were observed in the superficial horizons, especially in the antrópico LAd and antrópico CHd (45.0g kg-1). Were observed predominance of recalcitrant organic material. It appears that most of the C found in the SOM fractions is associated with C stabilization mechanisms such as the recalcitrance provided by the presence of pyrogenic coal, in addition to its ability to present carboxylic groups that increase its interaction with the mineral fraction of the soil, characterizing the mechanism of chemical protection. It is observed that the SOM fractions can function as indicators that contribute to better understanding of the soil carbon dynamics in soils with antrópico horizons.

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