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Pedogenesis and molecular characterization of sombric horizons in soils in Tijucas do Sul region - PR

Grant number: 15/03577-2
Support type:Scholarships in Brazil - Master
Effective date (Start): September 01, 2015
Effective date (End): January 31, 2017
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal researcher:Pablo Vidal Torrado
Grantee:Mariane Chiapini
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil


Soil organic matter is an important source of carbon to the atmosphere. Because of this, it is important to understand the stability of soil organic matter, which is related to various processes. Intrinsic properties thereof may be related to its stability, as well as carbon black considered resistant to degradation. Moreover, the stability of organic matter is essential for tropical and subtropical soils, since the weather of the tropics favor the decomposition of organic matter. In most soils the most darkened horizons coincide with the layers or surface horizons due to greater accumulation of organic matter, but in the states of the south of the country notes with some frequency the presence of soils with darkened subsurface horizons, which call attention by being an unusual feature. The dark horizon in subsurface soils of these resembles a horizon Sombric. The horizon Sombric is a horizon with characteristics such as: evidence of humus accumulation that does not meet the definition of spodic horizon nor has features which indicate that it was buried horizon. In southern Brazil there are soils with similar morphological features to the Sombric horizons, and some assumptions about the origin of the dark subsurface horizons, may be related to: a) changes in the nature of the organic material from the surface horizon, due to changes in vegetation induced climate change, which promoted the decomposition of this profile area with persistence in subsurface organic matter such as fumed; b) the humus soil in these could have been transported and accumulated in these horizons in combination with clay or similar in the form of organometallic compounds, as in Podzolization. These questions led to further study the genesis of the darkened horizons (Sombric Horizons) South Tijucas region in the state of Paraná. The study will contribute to a better understanding of the stability and dynamics of organic matter by molecular characterization of this in soils as well as important information related to paleoclimatic studies in the region. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARIANE CHIAPINI; JAIRO CALDERARI DE OLIVEIRA JUNIOR; JUDITH SCHELLEKENS; JAIME ANTONIO DE ALMEIDA; PETER BUURMAN; PABLO VIDAL-TORRADO. Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification. Scientia Agricola, v. 78, n. 4, p. -, 2021. Web of Science Citations: 0.
CHIAPINI, MARIANE; SCHELLEKENS, JUDITH; CALEGARI, MARCIA REGINA; DE ALMEIDA, JAIME ANTONIO; BUURMAN, PETER; DE CAMARGO, PLINIO BARBOSA; VIDAL-TORRADO, PABLO. Formation of black carbon rich `sombric' horizons in the subsoil - A case study from subtropical Brazil. Geoderma, v. 314, p. 232-244, MAR 15 2018. Web of Science Citations: 3.

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