Data/hora: 23/09/2024 16:35:59

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	03/04/1995	
Data da última atualização: 	04/04/2017	
Autoria: 	OESTERHELD, M.; McNAUGHTON, S. J.	
Título: 	Interactive effect of flooding and grazing on the growth of serengerti grasses.	
Ano de publicação: 	1991	
Fonte/Imprenta: 	Oecologia, v.88, n.2, p.153-156, 1991.	
Idioma: 	Inglês	
Conteúdo: 	Grazing and flooding may potentially interact in particular habitats of many grassland regions around the world. We tested the hypothesis that grazing and flooding induce different and largely opposed allocation responses in individual plants. As a result, their combined effect on plant growth would be negative. We studied the response of three grass species from the Serengeti ecosystem (Tanzania to the effects of flooding and clipping. Plants under the combined effect of flooding and clipping had lower growth rates than plants growing under the effects of either of the two factors individually. Plants under flooding grew taller and allocated more resources to stem growth than controls; for two of the three species, flooded plants also generated a new root system above soil level. All these morphological and physiological responses conflict with the ability of a plant to respond to defoliation with minimum reduction in growth rates. The three species showed a response to flooding reflecting their distribution ranges in the field: the species from the most flood-prone habitat showed a positive effect of flooding on growth, whereas the species from dry uplands showed a strong negative effect of flooding. Flood-tolerant species were taller and less tolerant of clipping than flooding sensitive species. Our results suggest that in ecological time, individuals subjected to both flooding and grazing have their growth reduced to a greater extent than by either of the two factors individually whereas in evolutionary time, species adapted to flooding are poor grazing tolerators and species adapted to grazing are poor flooding tolerators.	
Palavras-Chave: 	Allocation; Alocacao; Flooding; Growth; Inteiracao; Interaction; Serengeti.	
Thesagro: 	Crescimento; Ecologia; Inundação; Pastagem.	
Thesaurus Nal: 	ecology; grazing.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (27885-1) - ADD - SP - PP - SP14192 -  - 14192 - DIS