Hyperseasonal cerrado, a new brazilian vegetation form

Batalha, Marco Antônio; Cianciaruso, Marcus V.; Silva, I A; Delitti, Welington Bráz Carvalho

doi:10.1590/s1519-69842005000400021

Cited by 23 publications

(21 citation statements)

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“…This less abundant and poor development on floodplains by H. suaveolens and C. odorata, is probably because of their physiological incapacity of tolerating temporary flooding. This also reflects the physiological incapacity of the majority of wet grassland species in tolerating dryness as reported by Batalha et al (2005). Soil texture and temporary flooding of the vegetation seem to constitute a principal factor reducing the aerobic breathing of roots, as well as the mineral and water absorption of H. suaveolens and C. odorata.…”

Section: Discussionsupporting

confidence: 65%

Topographic and edaphic factors determining Chromolaena odorata and Hyptis suaveolens invasion of grassland in the Guineo-Congolian / Sudanian transition zone (Benin)

Aboh¹,

Teka²,

Djikpo³

et al. 2017

J. App. Bioscience.

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Objectives: Soil properties-invasive vegetation relationships remains uninvestigated. This study aimed at analyzing the main ecological factors, which explain the spatial distribution of two invasive species: Chromolaena odorata (Siam weed) and Hyptis suaveolens (Tea-bush). Methodology and Results:The Data were collected in 33 plots installed randomly according to the phytosociological method. These data were submitted to the Canonical Analysis of Correspondence. The, wet grasslands contamined were distinguished from grasslands of dry plateaus. A difference was also made between establishment and invasion from the step of contamination of both plants. The relevant edaphic main factors related to grasslands on dry plateau were sandy rate, pH, potassium and carbon rate. Wet grasslands of floodplains were located on soils with a high concentration of clay and silt, phosphorus, calcium and magnesium, as well as a high cation exchange capacity. Conclusions and application of findings: It could be concluded that the texture-moisture of the soil is the main factor, which explained the invasion intensity and the floristic composition of the investigated savannah. Dry plateau soil and oligotrophe induced the development of these alien plants. Therefore, it was suggested planning activities to prevent the expansion of these species on dry plateau grasslands.

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Section: Discussionsupporting

confidence: 65%

Topographic and edaphic factors determining Chromolaena odorata and Hyptis suaveolens invasion of grassland in the Guineo-Congolian / Sudanian transition zone (Benin)

Aboh¹,

Teka²,

Djikpo³

et al. 2017

J. App. Bioscience.

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“…Hyperseasonal cerrado areas normally appear in interfluvial regions with poorly drained soils (Sarmiento, 1983), being very restricted within the Cerrado domain, whose cerrado areas are almost seasonal. Nevertheless, Batalha et al (2005) found a small area, composed of cerrado species, which is the first occurrence of a hyperseasonal cerrado, in Emas National Park (ENP), central Brazil.…”

Section: Methodsmentioning

confidence: 99%

“…Nutrient in three herbaceous vegetation forms -hyperseasonal cerrado, seasonal cerrado, and wet grassland -in ENP, a core cerrado site. In ENP, number of species is higher in the wet grassland and lower in the hyperseasonal cerrado (Batalha et al, 2005). But, is this pattern related to soil characteristics?…”

Section: Introductionmentioning

confidence: 95%

Soil chemical factors and grassland species density in Emas National Park (central Brazil)

Amorim

Batalha

2008

Braz. J. Biol.

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Studies of grasslands on specific soil types suggest that different nutrients can limit biomass production and, hence, species composition and number. The Brazilian cerrado is the major savanna region in America and once covered about 2 million km 2 , mainly in the Brazilian Central Plateau, under seasonal climate, with wet summer and dry winter. In view of the importance of soil chemical factors in the distribution of the vegetation forms within the Cerrado domain and which may influence the number of species, we analyzed some soil characteristics in three herbaceous vegetation forms -hyperseasonal cerrado, seasonal cerrado, and wet grassland -in Emas National Park, a core cerrado site, to investigate the relationship between number of species and soil characteristics. We collected vegetation and soil samples in these three vegetation forms and submitted the obtained data to multiple linear regression. We found out that aluminum and pH were the best predictors of species density, the former positively related to species density and the latter negatively related. Since the predictable variation in species density is important in determining areas of conservation, we can postulate that these two soil factors are indicators of high species density areas in tropical grasslands, which could be used in selecting priority sites for conservation.Keywords: aluminum, nutrient limitation, pH, soil, species density. Características químicas do solo e densidade de espécies em comunidades herbáceas no Parque Nacional das Emas (Brasil central) ResumoEstudos em comunidades herbáceas em tipos específicos de solos sugerem que diferentes nutrientes podem limitar a produção de biomassa e, também, a composição e o número de espécies. O cerrado brasileiro é a maior região de savana na América e ocupava, originalmente, cerca de 2 milhões de km 2 , principalmente no Planalto Central Brasileiro. Encontra-se sob clima estacional, com verão chuvoso e inverno seco. Como as variáveis químicas do solo são importantes na distribuição das formas de vegetação no domínio do Cerrado e podem influenciar no número de espécies, analisamos algumas variáveis edáficas em três formas vegetacionais herbáceas -cerrado hiperestacional, cerrado estacional e campo úmido -no Parque Nacional das Emas, uma região nuclear de cerrado, para investigar quais seriam as relações entre o número de espécies e as características do solo. Coletamos amostras de solo e vegetação nesses três ambientes e submetemos os dados obtidos a uma análise de regressão múltipla linear. Encontramos que o alumínio e o pH foram os melhores previsores da densidade de espécies, sendo o primeiro relacionado positivamente com a densidade de espécies, e o último, negativamente. Já que a variação previsível na densidade de espécies é importante para se determinar áreas de conservação, podemos postular que esses dois fatores do solo podem ser indicadores de áreas com alta densidade de espécies em comunidades herbáceas tropicais, que poderiam ser usados para a escolha de locais prioritár...

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“…The consequences of waterlogging to savanna species can be fatal, because, as aerobic respiration ceases, levels of energy-rich adenylates drop rapidly, causing a dramatic decline in ion uptake and transport (Crawford, 1982;Koslowski, 1997). It is known that waterlogging determines the species abundance in hyperseasonal savannas (Sarmiento, 1983;Sarmiento, 1996;Batalha et al, 2005;Cianciaruso et al, 2005), but does it alter species convergences towards life-forms with more protected regeneration buds?…”

Section: Introductionmentioning

confidence: 99%

Species convergence into life-forms in a hyperseasonal cerrado in central Brazil

Batalha

2008

Braz. J. Biol.

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Whether the functional structure of ecological communities is deterministic or historically contingent is still quite controversial. However, recent experimental tests did not find effects of species composition variation on trait convergence and therefore the environmental constraints should play the major role on community convergence into functional groups. Seasonal cerrados are characterized by a sharp seasonality, in which the water shortage defines the community functioning. Hyperseasonal cerrados experience additionally waterlogging in the rainy season. Here, we asked whether waterlogging modifies species convergences into life-forms in a hyperseasonal cerrado. We studied a hyperseasonal cerrado, comparing it with a nearby seasonal cerrado, never waterlogged, in Emas National Park, central Brazil. In each area, we sampled all vascular plants by placing 40 plots of 1 m 2 plots in four surveys. We analyzed the species convergences into life-forms in both cerrados using the Raunkiaer's life-form spectrum and the index of divergence from species to life-form diversity (IDD). The overall life-form spectra and IDDs were not different, indicating that waterlogging did not affect the composition of functional groups in the hyperseasonal cerrado. However, there was a seasonal variation in IDD values only in the hyperseasonal cerrado. As long as we did not find a seasonal variation in life-form diversity, the seasonal variation of convergence into life-forms in the hyperseasonal cerrado was a consequence of the seasonal variation of species diversity. Because of high functional redundancy of cerrado plants, waterlogging promoted a floristic replacement without major changes in functional groups. Thus, waterlogging in the hyperseasonal cerrado promoted seasonal changes in species convergence into life-forms by reducing species diversity.Keywords: hyperseasonal cerrado, IDD, life-form, species diversity, trait convergence. Convergência de espécies em formas de vida em um cerrado hiperestacional no Brasil central ResumoSe a estrutura ecológica das comunidades é determinística ou historicamente dependente é ainda um tema controverso. Entretanto, testes experimentais recentes não encontraram efeitos da variação da composição de espécies na convergência de traços funcionais e, portanto, as restrições ambientais devem ter um papel principal na convergência das comunidades em grupos funcionais. Cerrados estacionais são caracterizados por uma estacionalidade pronunciada, em que a seca define o funcionamento da comunidade. Cerrados hiperestacionais experimentam adicionalmente um alagamento na estação chuvosa. Aqui, perguntamo-nos se o alagamento modifica a convergência de espécies em formas de vida em um cerrado hiperestacional. Para tanto, estudamos um cerrado hiperestacional, comparando-o com um cerrado estacional, nunca alagado, no Parque Nacional das Emas, GO. Em cada cerrado, usamos 40 parcelas de 1 m 2 e amostramos todas as plantas vasculares. Analisamos a convergência de espécies em formas de vida usando o esp...

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Hyperseasonal cerrado, a new brazilian vegetation form

Cited by 23 publications

References 0 publications

Topographic and edaphic factors determining <i>Chromolaena odorata</i> and <i>Hyptis suaveolens</i> invasion of grassland in the Guineo-Congolian / Sudanian transition zone (Benin)

Topographic and edaphic factors determining <i>Chromolaena odorata</i> and <i>Hyptis suaveolens</i> invasion of grassland in the Guineo-Congolian / Sudanian transition zone (Benin)

Soil chemical factors and grassland species density in Emas National Park (central Brazil)

Species convergence into life-forms in a hyperseasonal cerrado in central Brazil

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