Data/hora: 18/06/2024 13:40:46

Biblioteca(s): | Embrapa Solos.
Data corrente: | 16/09/2021
Data da última atualização: | 16/09/2021
Autoria: | ARAUJO, J. K. S.; SOUZA JÚNIOR, V. S. de; MARQUES, F. A.; VORONEY, P.; SOUZA, R. A. da S.; CORRÊA, M. M.; CÂMARA, E. R. G.
Afiliação: | JANE KELLY SILVA ARAUJO, UFRPE; VALDOMIRO SEVERINO DE SOUZA JÚNIOR, UFRPE; FLAVIO ADRIANO MARQUES, CNPS; PAUL VORONEY, UNIVERSITY OF GUELPH; REGILENE ANGELICA DA SILVA SOUZA, UFRAM; MARCELO METRI CORRÊA, UFRPE; ELIS REGINA GUIMARÃES CÂMARA, UFRPE.
Título: | Umbric Ferralsols along a climosequence from the Atlantic coast to the highlands of northeastern Brazil: characterization and carbon mineralization.
Ano de publicação: | 2017
Fonte/Imprenta: | Geoderma, v. 293, p. 34-43, May 2017.
DOI: | https://doi.org/10.1016/j.geoderma.2017.01.022
Idioma: | Inglês
Conteúdo: | A thick umbric horizon (~ 1 m) is an important component in the balance of the carbon (C) cycle. However, little is known about the characteristics and C stability in the umbric horizon of Ferralsols, the tropical environments surrounded by semi-arid regions in northeastern (NE) Brazil. This study aimed to evaluate (i) morphological, physical, chemical, biological and mineralogical attributes and (ii) C accumulation in the surface and subsurface within five Umbric Ferralsols along a 475-km climosequence from 143 to 963 m a.s.l. located in coastal and upland areas in NE Brazil. Soil samples were collected in all of the horizons. Umbric Ferralsols present characteristics that are primarily influenced by their sedimentary parent material, which are mostly kaolinitic. The texture ranges from sandy clay loam to very clayey with an absence of macroscopic coal in depth. There is greater C storage of the umbric horizon in the coastal areas with hot and humid climates. This indicates that the current climate is not the predominant factor in the formation of the umbric epipedon. C mineralization in the surface horizons was related to potentially mineralizable nitrogen (N) and labile and organic C, suggesting that the quality of the organic substrate and mainly the N dynamic can drive the accumulation of C. In contrast, C mineralization in subsurface horizons was primarily influenced by forms of aluminum and oxalate-extractable iron and was independent of soil organic matter fractions. However, in the umbric horizon, crystalline forms of iron were mainly associated with protection against C mineralization.
Palavras-Chave: | Deep carbon; Microbial respiration; Semiárido; Soil nitrogen.
Thesagro: | Carbono; Nitrogênio.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (20741-1) - UPC - AP - DD -  -  -  - DIS