Data/hora: 03/06/2024 00:45:02

Provedor de dados: | Revista Brasileira de Ciência do Solo
País: | Brazil
Título: | Planosols Developed in Different Geoenvironmental Conditions in Northeastern Brazil
Autores: | Ferreira,José Thales Pantaleão; Ribeiro Filho,Mateus Rosas; Ribeiro,Mateus Rosas; Souza Júnior,Valdomiro Severino de; Bittar,Sheila Maria Bretas; Santos,Robson Gomes dos.
Data: | 2016-01-01
Ano: | 2016
Palavras-chave: | Soil mineralogy; Weathering; Climate; Semiarid.
Resumo: | ABSTRACT The semiarid region of northeastern Brazil has a large area occupied by Planosols, where in the State of Pernambuco these soils are mainly used for livestock farming and subsistence crops. The knowledge on these soils is limited, which compromises the understanding on their behavior, potentialities and limitations.This study aimed to analyze morphological, chemical, physical and mineralogical attributes of Planosols developed under different geoenvironmental conditions. Morphological descriptions and chemical, physical and mineralogical analyses were performed in four profiles of Planosols along a rainfall gradient. An increase in rainfall allowed for an increase in the clay content in the Bt horizon and a reduction in ESP, EC, Na+, CEC, S, pH (water and KCl) and soil density. Horizons A and E were thicker in Planosols in more humid environments. The increase in ESP associated with the presence of expansive minerals (smectite and vermiculite) allowed the development of a prismatic structure in Haplic Planosols and a columnar structure in Natric Planosols. The mineralogical assembly is indicative of poorly weathered soils. The mineralogical assemblies of the silt and clay fractions were similar in the different geoenvironments, while higher contents of easily alterable minerals were observed in the composition of the sand fraction in environments with a drier climate.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100302
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/18069657rbcs20150131
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.40 2016
Fonte: | info:eu-repo/semantics/openAccess