Data/hora: 23/09/2024 15:51:34

Biblioteca(s): 	Embrapa Cerrados.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	A - 2	
Data corrente: 	23/12/2016	
Data da última atualização: 	09/01/2017	
Autoria: 	SANTA-ANNA, S. A. C. de; JANTALIA, C. P.; SA, J. M.; VILELA, L.; MARCHAO, R. L.; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M.	
Afiliação: 	Selenobaldo A. C. de Sant-Anna, Universidade Federal Rural do Rio de Janeiro; CLAUDIA POZZI JANTALIA, CNPAB; Jerusa M. Sa, Universidade Federal Rural do Rio de Janeiro; LOURIVAL VILELA, CPAC; ROBELIO LEANDRO MARCHAO, CPAC; BRUNO JOSE RODRIGUES ALVES, CNPAB; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; ROBERT MICHAEL BODDEY, CNPAB.	
Título: 	Changes in soil organic carbon during 22 years of pastures, cropping or integrated crop/livestock systems in the Brazilian Cerrado.	
Ano de publicação: 	2016	
Fonte/Imprenta: 	Nutrient Cycling in Agroecosystems, December 2016.	
Páginas: 	20 p.	
Idioma: 	Inglês	
Conteúdo: 	Abstract: In Brazil?s central savanna region, government policy is to encourage the conversion of conventional plough tillage (PT) agriculture to no-till (NT) and raise the productivity of under-utilized pastures, including their conversion to integrated crop-livestock (ICL) systems, with the objective of increasing soil organic carbon (SOC) at the expense of atmospheric carbon dioxide. An experiment was established in 1991 by liming and fertilizing at two levels an area of native vegetation (NV). The treatments, replicated in randomized plots, included pastures, continuous cropping and ICL systems under PT or NT. The aim of this study was to quantify the SOC accumulation to 100 cm depth under these treatments over time. The high C:N ratios suggested that there was a high proportion of charcoal present in the soil. Increasing fertilizer inputs had no overall significant effect on SOC stocks. Stocks of SOC changed little under pastures. Analyses of ¹³C abundance showed that higher fertilizer inputs increased the decomposition rate of C derived from NV under pure grass pastures. Continuous cropping under NT preserved SOC and under PT there were significant losses. The highest SOC stocks were found under ILP treatments, but not all ILP treatments accumulated SOC even under NT. These results indicate that government initiatives to substitute PT with NT and to intensify beef cattle production will have only modest short-term gains in SOC accumulation.	
Palavras-Chave: 	Abundância de Carbono; Pastagens tropicais; Sequestro de carbono; Sistema de criação de gado integrado.	
Thesagro: 	Carvão; Cerrado; Leguminosa Forrageira; Solo.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/152260/1/Sant-anna-et-2016.pdf	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (35660-1) - UPC - AP - PP - S2191 -  - S2191 - DIS