Data/hora: 24/09/2024 17:54:11

Biblioteca(s): 	Embrapa Arroz e Feijão; Embrapa Cerrados.	
Data corrente: 	24/04/2008	
Data da última atualização: 	20/10/2009	
Autoria: 	CARVALHO, A. M. de; BUSTAMANTE, M. M. da C.	
Afiliação: 	Arminda Moreira de Carvalho, CPAC; Mercedes Maria da Cunha Bustamante, UnB.	
Título: 	Emissões de NO, N2O e CO2 em agroecossistemas do Cerrado.	
Ano de publicação: 	2007	
Fonte/Imprenta: 	Planaltina, DF: Embrapa Cerrados, 2007.	
Páginas: 	26 p.	
Série: 	(Embrapa Cerrados. Documentos, 188).	
Idioma: 	Português	
Conteúdo: 	ABSTRACT: In the last 30 years, the Cerrado Biome has suffered very intense conversion of its native vegetation into croplands (Brazilian Savanna). This habitat modification has contributed with 25% and 90% of the total CO2 and N2O anthropogenic emission respectively. Soil preparation (tillage and no-tillage), deposition of crop residues, cultivation of N-fixing species and nitrogen fertilization are management practices that influence trace gas fluxes from soil to atmosphere. Nevertheless, the interaction between such practices and NO, N2O and CO2 fluxes in the Cerrado region is still unclear. Raining events after the dry season results in NO and CO2 pulses. The interaction between nitrogen application-during rain events affects NO and CO2 emissions. The soil in the no-tillage system when under leguminosae shows higher annual emissions of CO2. In the seasonal dry, most of the N2O fluxes values are below the detection limit. Higher NO fluxes are found immediately (5.4 ng NO-N cm-2 h-1) and 3 days (4,8 ng NO-N cm-2 h-1) after N fertilization and irrigation. After the first pulses of NO (5,4 ng NO-N cm-2 H-1 and 4,8 ng NO-N cm-2 h-1), the emission decreases significantly (1.9 ng NO-N cm-2 h-1). Residues of cover plants and nitrogen fertilization associated to raining events affects trace gas fluxes.	
Palavras-Chave: 	Solo: Levantamento e Mapeamento.	
Thesagro: 	Carbono; Conservação do Solo; Efeito Estufa; Gás; Manejo do Solo; Matéria Orgânica.	
Thesaurus Nal: 	carbon; gases; greenhouse effect; organic matter; soil conservation; soil management.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/CPAC-2009/28953/1/doc_188.pdf	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CNPAF - (28769-1) - EMB - FL - -- - FOL 5446 -  - 2009.05446 - DIS
CPAC - (28953-1) - UMT - FL - -- - FOL7886 -  - CRI7426 - DIS
CPAC - (28953-2) - UMT - FL - -- - FOL7886 -  - DOC247 - DIS
CPAC - (28953-3) - UMT - FL - -- - FOL7886 -  - FOl7886 - DIS