Data/hora: 20/05/2024 05:28:58

Provedor de dados: 	Revista Brasileira de Ciência do Solo	
País: 	Brazil	
Título: 	Characterization and Classification of Soils under Forest and Pasture in an Agroextractivist Project in Eastern Amazonia	
Autores: 	Zenero,Mariana Delgado Oliveira; Silva,Laura Fernanda Simões da; Castilho,Selene Cristina de Pierri; Vidal,Alix; Grimaldi,Michel; Cooper,Miguel.	
Data: 	2016-01-01	
Ano: 	2016	
Palavras-chave: 	Argissolos; Ultisols; Southeast of Pará; Soil classification; Saprolitic character; Aquic with episaturation (epirredóxico) character.	
Resumo: 	ABSTRACT: Knowledge of soils in the Amazon rainforest is becoming increasingly essential due to dynamics adopted by farmers that substitute forest for pastures, together with growing pressure from diverse segments of society towards adoption of sustainable production systems. The objective of this study was to characterize the soils along two toposequences, one under forest (F) and the other under pasture (P), and to verify how the change in land use influences soil attributes, evaluating their inclusion in the Brazilian Soil Classification System (SiBCS). The soils were sampled in pits located at the summit, backslope and footslope positions for morphological, chemical, physical, and clay mineralogy analysis. The results show that the soils are chemically poor and predominately kaolinitic. Sandy and loamy sand soils are in the surface horizons, with an increase in clay content with depth. The highest values of bulk density and lowest values of macroporosity were observed in the Bt horizons due to the change from a granular structure in the surface to an angular and subangular blocky structure in these horizons. The morphological properties observed in the field are strongly influenced by the annual soil water dynamics, the parent material, and the landscape, representing diagnostic characteristics that influenced classification of the soils, such as aquic with episaturation (epirredóxico), saprolitic, and gravelly. These diagnostic characteristics in the Argissolo Amarelo (Hapludults) are important morphological properties that have not been highlighted by the current edition of the SiBCS.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100314	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/18069657rbcs20160165	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.40 2016	
Fonte: 	info:eu-repo/semantics/openAccess