Data/hora: 01/06/2024 19:16:20

Provedor de dados: | 64
País: | Brazil
Título: | Lateral loss of clay in the genesis of Luvisols in the Semi-Arid Depression of the Jequitinhonha Valley, Minas Gerais - Brazil
Autores: | Gonçalves,Mariana Gabriele Marcolino; Ker,João Carlos; Oliveira,Fábio Soares de; Ramos,Letícia Onara Silva; Pacheco,Anderson Almeida; Curi,Nilton.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Soil mineralogy; Cation exchange capacity; Soil micromorphology.
Resumo: | ABSTRACT Soils of the semi-arid region of Minas Gerais have small depth; hard, very hard or even extremely hard consistency when dry and very plastic and very sticky when moist; columnar or angular blocky structure and significant cracking along the profile in the dry period, however they have not been deeply studied yet. Thus, the aim of this study was to detail the genesis of Luvisols in the Semi-arid Depression of the Jequitinhonha Valley (MG), incompassing morphological, physical, chemical, micromorphological and mineralogical attributes, and their relationships. The lack of illuviation coatings in the micromorphological analysis is in line with the expressionless and unclear clay skins observed in the top of the B horizon in only one out of the four soil profiles during the field work. Considering the occurrence of expandable 2:1 clay minerals, which can easily modify such pedological feature, caution is recommended in relation to soil genesis interpretation. The lateral loss of the clay fraction from the superficial horizons is highlighted as the main formation process of the Luvisols studied. The cation exchange capacity of these soils revealed remarkable lower values for the Luvisols in semi-arid Brazilian regions.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100234
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/1413-7054201943018219
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.43 2019
Fonte: | info:eu-repo/semantics/openAccess