Data/hora: 10/06/2024 03:52:18

Biblioteca(s): 	Embrapa Pantanal.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	B - 5	
Data corrente: 	01/08/2013	
Data da última atualização: 	12/08/2013	
Autoria: 	BERGIER, I.; RECH, R.; MONTEIRO, H. de C.; SORIANO, E.	
Afiliação: 	IVAN BERGIER TAVARES DE LIMA, CPAP; RAQUEL RUBIA RECH, CNPSA; HERNANDES DE CAMPOS MONTEIRO, CPAP; EDUARDO SORIANO, Ministério da Ciência, Tecnologia e Inovação.	
Título: 	User effects on chamber nitrous oxide emissions from oxisol soils in no-tillage maize fertirrigated with anaerobically digested swine manure.	
Ano de publicação: 	2013	
Fonte/Imprenta: 	Environment and Natural Resources Research, v. 3, n. 4, p. 1-11, 2013.	
Páginas: 	11 p.	
ISSN: 	1927-0488	
Idioma: 	Inglês	
Conteúdo: 	Closed static chambers are frequently adopted for estimating gas fluxes across environmental interfaces. In this study we assessed the effects of three gas sampling rates and two methods of chamber placement in fertirrigated
soils for estimating nitrous oxide (N2O) emissions, using chambers with similar design and on-site gas chromatography. The soils under analysis were fertirrigated with (liquid) digested swine manure at three different doses. The results indicate that N2O flux estimates are firmly determined by the chosen sampling rate, chamber placement, chamber design, and the emission magnitude itself. N2O fluxes were best estimated by faster sampling rates while gently placing the chamber at the soil surface due to conspicuous N2O emissions and relatively small chamber volume. A generalized chamber accumulation model developed by normalizing the dataset was used to illustrate effects on expected "low unforced-chamber", "high unforced-chamber" and "high forced-chamber" fluxes. We concluded that it is possible to adopt simple design and low-disturbing chambers with sufficient volume, height, and surface area for determining gaseous emissions across soil-air interfaces. Nevertheless, critical on-site gas sampling rate adjustment (by gas chromatography or other as precise real-time measuring device) is critical to avoid estimation inaccuracies in emission estimates.	
Palavras-Chave: 	Agroforestry-livestock integration; Sustainable production.	
Thesaurus Nal: 	agroecosystems; climate change; greenhouse gases.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (58785-1) - UPC - SP - PP - SP17756 -  - 17756 - DIS