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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
03/07/1997 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
SALA, O. E.; OESTERHELD, M.; LEON, R. J. C.; SORIANO, A. |
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Título: |
Grazing effects upon plant community structure in subhumid grassland of Argentina. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
Vegetatio, v.67, p.27-32, 1986. |
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Idioma: |
Inglês |
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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. |
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Palavras-Chave: |
Dinamica; Diversidade; Diversity; Dynamic; Efeito de pastagem; Estrutura da comunidade; Estrutura de comunidade; Flooding pampa; Grassland; Grazing effect; Plant. |
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Thesagro: |
Pastagem; Planta. |
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Thesaurus Nal: |
Argentina; basal area; community structure; dynamics; leaf area. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02408naa a2200373 a 4500
001 1791459
005 2017-04-05
008 1986 bl --- 0-- u #d
100 1 $aSALA, O. E.
245 $aGrazing effects upon plant community structure in subhumid grassland of Argentina.
260 $c1986
520 $aChanges 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.
650 $aArgentina
650 $abasal area
650 $acommunity structure
650 $adynamics
650 $aleaf area
650 $aPastagem
650 $aPlanta
653 $aDinamica
653 $aDiversidade
653 $aDiversity
653 $aDynamic
653 $aEfeito de pastagem
653 $aEstrutura da comunidade
653 $aEstrutura de comunidade
653 $aFlooding pampa
653 $aGrassland
653 $aGrazing effect
653 $aPlant
700 1 $aOESTERHELD, M.
700 1 $aLEON, R. J. C.
700 1 $aSORIANO, A.
773 $tVegetatio$gv.67, p.27-32, 1986.
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Registro original: |
Embrapa Pantanal (CPAP) |
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