Data/hora: 09/06/2024 14:57:18

Biblioteca(s): 	Embrapa Cerrados.	
Data corrente: 	05/05/1999	
Data da última atualização: 	05/05/1999	
Autoria: 	LEITE, G. G.; GOMES, A. C.; T. NETO, R.; B. NETO, C. R.	
Título: 	Expansao e senescencia de folhas de gramineas nativas dos Cerrados submetidas a queima.	
Ano de publicação: 	1998	
Fonte/Imprenta: 	Pasturas Tropicales, Cali, v.20, n.3, p.16-21, 1998.	
Idioma: 	Português	
Conteúdo: 	A study was carried out at the Agua Limpa Experimental Farm, located in the savannas of Brazil's Federal District, to study the effects of annual and biannual burning on different characteristics of the native grass species Echynolaena inflexa (Poiret) Chase, Trachypogon filifolius (Hach) Hitchc., Schyzachyrium tenerum Nees, and Axonopus barbigerus (Kunth) Hitchc. Characteristics studied were the dynamics of green tissue, expansion and senescence of lamina leaves. The study area included a Petric Plintsoil, a yellow-red Latosol, and a dark yellow-red Latosol. For each soil type, five plants that did not show signs of senescence were randomly selected for each species. Measurements of leaf extension and proportion of green and dead leafs were made at 4-week intervals. Regression and multivariate analyses were used to compare the proportion of live and dead tissue among the different species and soil types. The results show that leaf blade elongation of species increased during the wet summer months and decreased during the dry winter ones. This sequence followed the precipitation curve, regardless of soil type or frequency of burning. Leaf blade senescence increased with decreasing precipitation and temperature. The quantity of green tissue followed the precipitation curve for the region. Axonopus barbigerus and T.filifolius presented greater leaf elongation and lower leaf senescence in all soil types. Echynolaena inflexa and S. tenerum presented lower leaf blade elongation and senescence, regardless of soil type frequency of burning, suggesting that management strategies should be used to preserve or increase these two grass species in native pastures in the savanna region.	
Palavras-Chave: 	Senescence.	
Thesagro: 	Cerrado; Gramínea; Queimada; Senescência.	
Thesaurus Nal: 	burning; grasses.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (2374-1) - UPC - SP - -- - CRI4921 -  - CRI4921 - DIS