Data/hora: 22/06/2024 02:41:11

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	28/12/2016	
Data da última atualização: 	28/12/2016	
Autoria: 	QUEIROZ, J. S. de; NORTON, B. E.	
Afiliação: 	João Stacishin de Queiroz; Brien E. Norton.	
Título: 	An assessment of an indigenous soil classification used in the caatinga region of Ceara State, Northeast Brazil.	
Ano de publicação: 	1992	
Fonte/Imprenta: 	Agricultural Systems, v. 39 n. 3, p. 289-305, 1992.	
DOI: 	10.1016/0308-521X(92)90101-S	
Idioma: 	Inglês	
Conteúdo: 	Abstract: An indigenous soil classification used in the caatinga region of Ceara State, Northeast Brazil, was mastered in the course of a resource inventory in the Acarau Valley. This paper considers its validity using (1) its usefulness as a tool for objectively grouping soils; and (2) the strength of the link between soil quality and class membership. Cluster analyses using morphological attributes from 36 profiles were used to determine how well the classification met the first criterion; percentage moisture equivalent and pH values were examined to assess the classification in terms of the second criterion. The classification's limitations and potential for wider geographic application were assessed in conjunction with a farm survey covering a larger portion of Ceara State. The cluster analyses produced three major clusters that corresponded closely to the broad classes of the indigenous soil classification. This corroborated the validity of the indigenous classification as a tool for objectively grouping morphologically similar soils. However, it was noticed that class names, although extensively used, may have different meanings in physiographically contrasting regions. Because of this it is necessary to establish the local relationship between class name and soil characteristics. Intra-cluster percentage moisture equivalent and pH values varied widely but tended to concentrate in relatively narrow areas of the range of values for all three clusters. This demonstrated the usefulness of the indigenous classification as a framework to group soils physicochemically.	
Palavras-Chave: 	Acarau Valley; Brasil; Ceará; Indigenous lands; Região Nordeste; Terra Indígena; Vale do Acaraú.	
Thesagro: 	Caatinga; Classificação do solo; Vegetação.	
Thesaurus Nal: 	Soil classification.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)	
Exemplares: 	CNPC - (32299-1) - ADD - AP - PP -  -  -  - DIS