Data/hora: 21/09/2024 07:09:46

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	31/01/2017	
Data da última atualização: 	31/01/2017	
Autoria: 	WATANABE, R.; FIGUEIREDO, G. C.; SILVA, A. P. da; NEVES, J. C. L.; OLIVEIRA, T. S. de.	
Afiliação: 	Rafaela Watanabe; Getulio Coutinho Figueiredo; Alvaro Pires da Silva; Júlio César Lima Neves; Teógenes Senna de Oliveira.	
Título: 	Physical quality of a Luvisol under agroforestry systems in a semi-arid region, Brazil.	
Ano de publicação: 	2016	
Fonte/Imprenta: 	Soil Research, v. 54, N. 4, p. 430-439, 2016.	
DOI: 	http://dx.doi.org/10.1071/SR15179	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Agroforestry systems provide many environmental benefits in semi-arid regions; however, trampling by cattle, and agricultural practices, can degrade physical quality of the soil. The aim of this study was to evaluate the degree of compaction and the compression behaviour of a Luvisol after 14 years under agro-silvopastoral (ASP) and silvopastoral systems (SILV), compared with a soil under natural vegetation (NV). We evaluated the degree of soil compactness, compaction index, pre-consolidation pressure, maximum bulk density, critical water content and the stocks of total organic carbon (C), organic matter (OM), C in light organic matter (LOM), and nitrogen (N) in LOM. The results indicated that agroforestry systems change the compressive behaviour of the soil, increasing maximum bulk density (P < 0.05) and reducing critical water content (P < 0.05). Despite the increases in maximum bulk density, changes induced by agroforestry system did not affect the pore space, as shown by similar values for degree of compactness (P > 0.05) under ASP, SILV and NV. This suggests a change in the quality of OM, as evidenced by the lower values for stocks of N in LOM (P < 0.10) and total organic C (P < 0.05) under ASP and SILV, whereas pre-consolidation pressure was unaffected (P > 0.05). After 14 years, the degree of compactness and load-bearing capacity of the soils under ASP and SILV had not increased, being suitable for plant growth. After 14 years of agroforestry land use (in silvopastoral and agro-silvopastoral systems), compression behaviour of the soil was stable, with no increases in the degree of compactness or load-bearing capacity, indicating suitability for plant growth.	
Palavras-Chave: 	Agrosilvopastoral systems; Brasil; Capacidade de suporte de carga; Carga animal; Load-bearing capacity; Pisoteio animal; Semiárido; Sistema agroflorestal; Sistema agrosilvopastoril; Sistema silvopastoril; Soil chemicophysical properties; Soil physical quality; Trampling.	
Thesagro: 	Compactação do solo; Crescimento; Pastejo; Planta; Qualidade; Solo.	
Thesaurus Nal: 	Brazil; plant growth; Semiarid soils; Silvopastoral systems; Soil compaction.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)	
Exemplares: 	CNPC - (32630-1) - ADD - AP - DD -  -  -  - DIS