Data/hora: 22/09/2024 07:38:23

Biblioteca(s): 	Embrapa Cerrados.	
Data corrente: 	18/03/1999	
Data da última atualização: 	18/03/1999	
Autoria: 	PIVELLO, V. R.; COUTINHO, L. M.	
Título: 	Transfer of macro-nutrientes to the atmosphere during experimental burnings in an open cerrado (Brazilian Savanna).	
Ano de publicação: 	1992	
Fonte/Imprenta: 	Journal of Tropical Ecology, New York, v.8, p.487-497, 1992.	
Idioma: 	Inglês	
Conteúdo: 	This paper presents the quantities of macro-nutrients (N, P, K, Ca, Mg and S) released from ground vegetation to the atmosphere during six experimental burnings, in a Brazilian open savanas, named campo-cerrado. The values were obtained by comparing the amounts of nutrients in the fuel and in the resulting after the burn, in three different seasons. On average, 20.6 kg of N, 1.6 kg of P, 7.1 kg of K, 12.1 kg of Ca, 3.0 kg of Mg, and 3,2 kg of S ha-1 were transferred from the plant biomass to the atmosphere, representing mean percentages of 95% for N, 51% for P, 44% for K, 52% for Ca, 42% for Mg, and 59% for S. The burn season showed no significant influence on the amounts of nutrients transferred to the atmosphere. Some relationships involving the quantities of macro-nutrients released, fuel moisture, the combustion efficiency during the burns, and the initial standing biomass in the area were also tested. Comparing the averege output of macro-nutrients to the atmosphere obtained in this study with their inputs via rainfall, in the same area, it was estimated that there years would be adequate interval between prescribed burnings for this campo-cerrado, to speed up nutritien recycling without impoverishing the system.	
Palavras-Chave: 	Ciclo de nutrientes; Cycling; Macronutriente; Sulphur.	
Thesagro: 	Cálcio; Cerrado; Enxofre; Fósforo; Macroelemento; Magnésio; Nitrogênio; Potássio; Queimada.	
Thesaurus Nal: 	burning; calcium; magnesium; nitrogen; phosphorus; potassium.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (1938-1) - ADD - SP - -- - CRI4754 -  - CRI4754 - DIS