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Temporal changes in species composition, diversity, and woody vegetation structure of savannas in the Cerrado-Amazon transition zone Acta Botanica
Maracahipes-Santos,Leonardo; Santos,Josias Oliveira dos; Reis,Simone Matias; Lenza,Eddie.
ABSTRACT Vegetation in the transition between tropical forest and savanna is hyperdynamic and there is evidence that in the absence of fire, forest advances over savanna. Between 2008 and 2013 we evaluated changes in species composition and diversity and in the structure of the woody vegetation of savanna physiognomies in the transition between the Cerrado and Amazon biomes that were fire free for 11 years. The physiognomies form a gradient from savanna woodland (Typical Cerrado - TC), to low woodland (Dense Cerrado - DC), to woodland (locally called Cerradão - CO). We hypothesise that: 1) the more open physiognomies (TC and DC) are more dynamic compared to the closed physiognomy (CO); and 2) in the absence of fire vegetation tends to become more forested....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alternative stable states; Biodiversity; Brazilian savanna; Conservation; Mortality; Recruitment.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200254
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Surface fire drives short-term changes in the vegetative phenology of woody species in a Brazilian savanna Biota Neotropica
Silvério,Divino Vicente; Pereira,Oriales Rocha; Mews,Henrique Augusto; Maracahipes-Santos,Leonardo; Santos,Josias Oliveira dos; Lenza,Eddie.
We evaluated the effects of fire on the vegetative phenological behavior (crown foliage cover, sprouting, mature and young leaves) of woody species at two sites in the Brazilian savanna, one of which had been accidentally burned. We used generalized additive mixed models to test the hypothesis that: 1) fire damages total foliage cover, thus leading to changes in vegetative phenological patterns. As this hypothesis was corroborated, we also tested whether 2) the damage caused by fire to the total crown foliage cover and mature leaves is greater in evergreen than in deciduous species, and 3) the negative effects of fire on vegetative phenology persist after the first fire-free year. The first two hypotheses were corroborated, but the third was not. Fire...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crown foliage cover; Deciduity; Fire ecology; Phenology; Sprouting.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000300104
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