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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

ithic soils in the semi-arid region of Brazil: edaphic characterization and susceptibility to erosio

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Author(s):
Pinheiro Junior, Carlos R. [1] ; Salvador, Conan A. [1] ; Tavares, Tiago R. [2] ; Abreu, Marcel C. [1] ; Fagundes, Hugo S. [1] ; Almeida, Wilk S. [3] ; Silva Neto, Eduardo C. [1] ; Anjos, Lucia H. C. [1] ; Pereira, Marcos G. [1]
Total Authors: 9
Affiliation:
[1] Fed Rural Univ Rio de Janeiro UFRRJ, Dept Soils, BR-23890 Seropedica, RJ - Brazil
[2] Univ Sao Paulo, Ctr Nucl Energy Agr CENA, BR-13416 Piracicaba, SP - Brazil
[3] Fed Inst Educ Sci & Technol Rondonia IFRO, BR-78930 Ariquemes, Rondonia - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF ARID LAND; v. 14, n. 1, p. 56-69, JAN 2022.
Web of Science Citations: 0
Abstract

Soils (Leptosols or Epileptic Regosols) with lithic contact at a depth of 50 cm occupy almost 20% of the Brazilian semi-arid region. These lithic soils are susceptible to erosion due to faster saturation of water-holding capacity during rainfall, which accelerates the beginning of runoff. However, erosion traits of lithic soils in the semi-arid region of Brazil are less studied. The aim of this study was to characterize the soil and landscape attributes in areas with Neossolos Litolicos (Entisols) in the Caatinga biome to identify region of high susceptibility to erosion. Results showed that the soils were characterized by a sandy texture, soil structure with poor development and low content of organic carbon. These attributes increase susceptibility to erosion and reduce water storage capacity, especially in the states of Ceara and Sergipe. In these states, the content of rock fragments in the soil reaches 790 g/kg. High contents of silt and fine sand, high silt/clay ratio, predominance of Leptosols and strong rainfall erosivity were observed in Piaui and northwestern Ceara. A very high degree of water erosion was observed in the states of Pernambuco and Paraiba. Despite the low degree of erosion observed in the state of Bahia, it is highly susceptible to erosion due to the predominance of very shallow soils, rugged relief and high values of rainfall erosivity. Lower vulnerability was observed in the state of Alagoas because of its more smoothed relief, greater effective soil depth, thicker A horizon of soil and lower rainfall erosivity. In general, the characteristics that intensify the susceptibility to erosion in the Caatinga biome are those soil structures with poor development or without aggregation, low contents of organic carbon, high contents of silt and fine sand, high values of silt/clay ratio and rugged relief in some regions. This study collected information contributing to a better characterization of soils with lithic contact in the semi-arid region of Brazil. In addition, regions with a higher susceptibility to erosion were identified, revealing insights that could help develop strategies for environmental risk mitigation. (AU)

FAPESP's process: 20/16670-9 - Spectral data modelling for tropical soil fertility analysis: association of vis-NIR and XRF techniques for the modernization of the traditional methods of analysis
Grantee:Tiago Rodrigues Tavares
Support Opportunities: Scholarships in Brazil - Post-Doctoral