Data/hora: 06/06/2024 09:11:26

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	03/07/1997	
Data da última atualização: 	05/04/2017	
Autoria: 	SALA, O. E.; OESTERHELD, M.; LEON, R. J. C.; SORIANO, A.	
Título: 	Grazing effects upon plant community structure in subhumid grassland of Argentina.	
Ano de publicação: 	1986	
Fonte/Imprenta: 	Vegetatio, v.67, p.27-32, 1986.	
Idioma: 	Inglês	
Conteúdo: 	Changes in plant community structure are identified as a result of grazing in grassland of the flooding pampa which evolved under supposedly light grazing conditions. The effects of excluding grazing upon total leaf area index was an increase of 30%. The largest response was observed in the distribution of leaves in the canopy. In the grazed areas, most of the green material was concentrated in the 0-5 cm layer while in the ungrazed treatments the largest portion of the leaf area was in the 10-30 cm layer. Grazing exclusion resulted in a small change in total basal area but a larger change in its distribution, from many small tussocks to less numerous large ones. The effects of grazing upon leaf area and basal area was accounted for by changes in vigor as well as by changes in species composition. The major effect of excluding grazing upon species composition was the disappearance of some native planophile species and most of the exotics. The species composition of grazed areas of both communities was very similar while there large differences between the ungrazed areas and between the grazed and ungrazed areas of the same community. It is suggested that there is a group of species which responds to the coarse-grained signal of grazing and its presence can cause dissimilar communities to converge under grazing conditions. The other group of species responded to the fine-grained signal of the environmental conditions associated with topography.	
Palavras-Chave: 	Dinamica; Diversidade; Diversity; Dynamic; Efeito de pastagem; Estrutura da comunidade; Estrutura de comunidade; Flooding pampa; Grassland; Grazing effect; Plant.	
Thesagro: 	Pastagem; Planta.	
Thesaurus Nal: 	Argentina; basal area; community structure; dynamics; leaf area.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (34494-1) - ADC - SP - PP - SP15246 -  - 15246 - DIS
CPAP - (34681-1) - ADC - SP - PP - SP15326 -  - 15326 - DIS