Título:	Labile and stable fractions of soil organic matter under management systems and native cerrado.
Autoria:	FIGUEIREDO, C. C. de RESCK, D. V. S. CARNEIRO, M. A. C.
Afiliação:	CÍCERO CÉLIO DE FIGUEIREDO, UNIVERSIDADE DE BRASÍLIA DIMAS VITAL SIQUEIRA RESCK, CPAC MARCO AURÉLIO CARBONE CARNEIRO, UNIVERSIDADE FEDERAL DE GOIÁS.
Ano de publicação:	2010
Referência:	Revista Brasileira de Ciência do Solo, n. 34, p. 907-916, 2010.
Conteúdo:	Soil organic matter can be analyzed on the basis of the different fractions. Changes in the levels of organic matter, caused by land use, can be better understood by alterations in the different compartments. The aim of this study was to evaluate the effect of different management systems on the labile and stable organic matter of a dystrophic Red Latosol (Oxisol). The following properties were determined: total organic C and total N (TOC and TN), particulate organic C and particulate N (POC and PN), organic C and N mineral-associated (MOC and NM) and particulate organic C associated with aggregate classes (POCA). Eight treatments were used: seven with soil management systems and one with native Cerrado as a reference. The experiment was designed to study the dynamics of systems of tillage and crop rotation, alternating in time and space. The experimental design was a randomized block design with three replications. The soil samples were collected from five depths: 0–5, 5-10, 10–20, 20–30 and 30–40 cm. Changes in organic C by land use occurred mainly in the fraction of particulate organic matter (> 53 mm). Proper management of grazing promoted increased levels of particulate organic matter by association with larger aggregates (2–8 mm), demonstrating the importance of the formation of this aggregate class for C protection in pasture.
Thesagro:	Cerrado Matéria Orgânica Pastagem Plantio Direto Rotação de Cultura Solo
NAL Thesaurus:	No-tillage Particulate organic carbon Soil Organic matter Pastures Savanna soils
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAC)