Composição e dinâmica da biomassa aérea após a queima em savana gramíneo-lenhosa no Pantanal

Cardoso, E. L.; Crispim, S. M. A.; Rodrigues, C. A. G.; Júnior, Waldomiro Barioni

doi:10.1590/s0100-204x2000001100025

Cited by 13 publications

(11 citation statements)

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“…The families Poaceae and Cyperaceae showed a reduction in the wealth of species --the former in both sites and the latter only in the wet grassland. In the grassy-woody savanna of the Pantanal an increase in the number and frequency of the Cyperaceae's species and Eudicots was observed after fire (Cardoso et al 2000), suggesting that its suppression could influence the decline in the richness of these species, as observed in the ALF wet grassland after seven years without the presence of fire. Over time, only Poaceae and Asteraceae were common to the two sites among the five families with the highest number of species.…”

Section: Resultsmentioning

confidence: 95%

Vascular flora in dry-shrub and wet grassland Cerrado seven years after a fire, Federal District, Brazil

Amaral¹,

Munhoz²,

Eugênio³

et al. 2013

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Studies of temporal dynamics for grassland sites report that fire suppression plays a crucial role in floristic changes. The objective of this study was to verify whether after seven years without fire, communities showed variations in terms of composition, life forms, pollination and dispersal syndromes. The first survey (T0) was conducted from September 1999 to October 2000, while the second (T1) took place from August 2006 to August 2007. The floristic results in T1 were compared with the survey in T0 through the Sorensen similarity index and Chi-square tests. Over time, there were differences in the composition, life forms and pollination and dispersion syndromes. The evidence of changes suggests that the frequency of the fire regime can be considered the main agent for change in the flora of these communities.

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Section: Resultsmentioning

confidence: 95%

Vascular flora in dry-shrub and wet grassland Cerrado seven years after a fire, Federal District, Brazil

Amaral¹,

Munhoz²,

Eugênio³

et al. 2013

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“…Resultados semelhantes, em outras savanas queimadas no Pantanal, foram relatados por Rodrigues (1999) e Cardoso et al (2000a, 2000b. A produção de biomassa aérea no período subseqüente à queima apresentou incremento linear, decorrente da intensa rebrotação das espécies, estimuladas pelo fogo (Figura 1).…”

Section: Resultsunclassified

“…Na área sem queima, a produção de fitomassa seca foi expressiva, apresentando valores médios próximos a 3.600 kg/ha de MS, destacando-se como o componente de maior participação na composição botânica do campo de A. bicornis, constituindo aproximadamente 49% da matéria seca total. Em outro tipo de savana do Pantanal, sem predomínio por A. bicornis, foi constatada a presença de fitomassa seca em área sem queima, constituindo, aproximadamente, 37% da matéria seca total (Cardoso et al, 2000b).…”

Section: Resultsunclassified

“…Por outro lado, Mesosetum chaseae apresentou biomassa significativamente maior (P<0,05) na área com queima, correspondendo a aproximadamente quatro vezes mais matéria seca que a obtida na área sem queima. O comportamento de A. purpusii e M. chaseae foi diferente do observado por Cardoso et al (2000b) em savana gramíneo-lenhosa sem predominância de A. bicornis, evidenciando que a resposta das plantas ao fogo também pode variar de acordo com as condições do ambiente.…”

Section: Meses Após a Queimaunclassified

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Efeitos da queima na dinâmica da biomassa aérea de um campo nativo no Pantanal

Cardoso

Crispim

Rodrigues

et al. 2003

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar os efeitos da queima na dinâmica da biomassa aérea do estrato herbáceo de um campo nativo do Pantanal com predominância de Andropogon bicornis. A área de estudo foi submetida aos tratamentos sem queima e com queima, ambos sem pastejo. Os dados de biomassa aérea e cobertura do solo foram analisados nos onze meses subseqüentes à queima. A biomassa aérea das áreas com queima apresentou pequeno incremento linear de matéria seca, tornando sua biomassa significativamente menor que a obtida nas áreas sem queima. Andropogon bicornis, Axonopus purpusii e outras espécies apresentaram menor biomassa após a queima, enquanto Mesosetum chaseae foi favorecido pela queima, apresentando maior produção de matéria seca. A ação do fogo removeu praticamente toda a biomassa; a cobertura do solo, trinta dias após a queima, foi de aproximadamente 35%. Somente sete meses depois, a cobertura do solo foi restabelecida, tornando-se semelhante à área sem queima.Termos para indexação: Andropogon bicornis, planta herbácea, estrato vegetal, pastagem nativa, manejo de pastagens. Effects of burning on the aerial biomass dynamics of a native field in the PantanalAbstract -This work aimed to assess the effects of burning on the aerial biomass dynamics of aboveground herbaceous plants of a native field of the Pantanal presenting a dominance of Andropogon bicornis. The area under study was treated without burning (control) and with burning, both of them ungrazed. Aerial biomass and soil cover were analyzed during eleven months after burning. The aerial biomass in the with-burning area presented a short linear increment of dry matter. This biomass was expressively shorter than that biomass produced in the without-burning area. Andropogon bicornis, Axonopus purpusii and other species presented less biomass after burning. However, Mesosetum chaseae benefited from burning, presenting higher dry matter production. Burning almost removed all of the vegetal cover and, thirty days after burning, soil cover was approximately 35%. Seven months after burning, vegetal cover was re-established and became similar to the area without burning.

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“…Until now, it was sampled only in the Pantanal of the state of Mato Grosso do Sul (Cardoso et al 2000), in the Federal District (Pereira et al 2004;Felfi li et al 2007) and in the Quadrilátero Ferrífero area of Minas Gerais (Salino & Almeida 2008). Regarding the bryophytes, this study is the fi rst record of Leucoloma serrulatum (Dicranaceae) and the second record of Sphagnum cyclophyllum (Sphagnaceae) in Goiás (see Sousa et al 2010;Yano 2011).…”

Section: Eleocharis Fi Liculmismentioning

confidence: 99%

Floristic and phytosociological analysis of palm swamps in the central part of the Brazilian savanna

2013

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We analyzed the fl oristics and phytosociology of three palm swamps in the municipality of Bela Vista de Goiás, located in the state of Goiás, Brazil, in the central part of the Brazilian savanna (Cerrado). Th e fl oristic surveys were conducted monthly from May 2008 to April 2009, and 310 species were recorded (seven bryophytes, 15 ferns and 288 angiosperms). Bryophytes belonged to fi ve genera and fi ve families; ferns belonged to nine genera and nine families; and angiosperms belonged to 134 genera and 45 families. Th e angiosperm families with the highest species richness were Poaceae, Cyperaceae, Asteraceae, Eriocaulaceae, Xyridaceae, Lentibulariaceae, Melastomataceae, Rubiaceae and Fabaceae. Th e palm swamps were divided into three zones of increasing humidity: edge, middle and core. Th e number of species was higher in the middle than at the edge and the core. Th e families with the highest cover values were Cyperaceae, Melastomataceae, Arecaceae and Poaceae. Although the palm swamps had been disturbed to varying degrees, those disturbances did not aff ect the fl ora in the middle or the core. Floristic similarity was high between these two zones within a given palm swamp and low between the edges of diff erent palm swamps. Acta Botanica Brasilica 27(1): 205-225. 2013. IntroductionWetlands are environments in which water is the determining factor of abiotic and biotic conditions (Keddy 2000, Steinke & Saito 2008. Th ese areas support several typical animal and plant species and foster a large number of ecological processes that sustain those species (Maltchik et al. 2003), making wetlands some of the most productive environments on the planet (Steinke & Saito 2008).In the Brazilian savanna (Cerrado), despite the dominance of phytophysiognomies on well-drained soils, wetlands such as palm swamps also occur (Meireles et al. 2002). Palm swamps are communities composed of a continuous herb-grass layer, which occupies most of their area, and a tree-shrub layer dominated by individuals of the palm Mauritia fl exuosa L. f. (local name, buriti), with a canopy cover of between 5% and 10% (Ribeiro & Walter 2008).In addition to the diversity of plant species (Araújo et al. 2002, Guimarães et al. 2002, palm swamps present some distinct micro-ecosystems in which there are some plant-animal interactions that are still poorly understood (Oliveira et al. 2009). Th ese environments serve as refuges, food sources and reproduction sites for the aquatic and terrestrial fauna of the adjacent phytophysiognomies (Guimarães et al. 2002). Th ey are also sites of great scenic beauty with economic and sustainable potential for ecotourism and for extractivism involving species such as M. fl exuosa and Syngonanthus nitens (Bong.) Ruhland (capim-dourado, which means "golden grass") by small rural communities (Schmidt et al. 2008).Palm swamps are categorized as areas of permanent preservation, for ensuring the maintenance of springs and the quality of watercourses (Araújo et al. 2002). Although legally protected, palm swamps ha...

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Composição e dinâmica da biomassa aérea após a queima em savana gramíneo-lenhosa no Pantanal

Cited by 13 publications

References 2 publications

Vascular flora in dry-shrub and wet grassland Cerrado seven years after a fire, Federal District, Brazil

Vascular flora in dry-shrub and wet grassland Cerrado seven years after a fire, Federal District, Brazil

Efeitos da queima na dinâmica da biomassa aérea de um campo nativo no Pantanal

Floristic and phytosociological analysis of palm swamps in the central part of the Brazilian savanna

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