-(Floristic composition and structure of woody vegetation in a cerrado rupestre, Cocalzinho de Goiás, Goiás State, Brazil). A vegetation survey of the woody species (at least 5 cm of trunk diameter at 30 cm above the ground) was conducted in a savanna on rocky soil (cerrado rupestre) in Cocalzinho de Goiás municipality, Goiás State, Brazil (15°48' S and 48°45' W). The objective was to compare the structure characteristics and the floristics of cerrado rupestre with those features found in cerrado stricto sensu areas occuring on deep soils in Central Brazil. The sample consisted in 1.0 hectare (ten plots, 20 × 50 m) in cerrado rupestre. The cerrado rupestre studied showed structural similarities with the physiognomy of open cerrado (cerrado ralo). The richness and the species diversity are similar with other Brazilian savanna (cerrado stricto sensu areas of Brazil Central). The floristic composition revealed species predominantly from other physiognomies from the cerrado stricto sensu and to a lesser extent, species from forest formations from the bioma and endemics from this rocky environment. The floristic richness and diversity is similar to other savanna areas of Central Brazil. In structural terms, the density and basal area are similar to values found in open cerrado vegetation. The limiting environmental conditions, mainly edaphics, do not result in expressive changes in floristic composition, richness, and species diversity, but promoted reduction in density and basal area of the wood species in the cerrado rupestre studied.Key words -Central Brazil, Cerrado, phytosociology, rocky soil environment RESUMO -(Composição florística e estrutura da vegetação arbustivo-arbórea em um cerrado rupestre, Cocalzinho de Goiás, Goiás). Foi realizado um levantamento da vegetação arbutivo-arbórea (indivíduos com diâmetro a 30 cm do solo ≥ 5 cm), em 1,0 hectare de cerrado rupestre (dez parcelas de 20 × 50 m), localizado em Cocalzinho de Goiás, Goiás, Brasil (15°48' S e 48°45' W). O objetivo foi avaliar e comparar as relações florísticas e as características estruturais deste cerrado sobre afloramentos rochosos com aquelas encontradas nos estudos já realizados em áreas de cerrado sentido restrito sobre solos profundos, localizados no Brasil Central. A composição florística do cerrado rupestre estudado é formada predominantemente por espécies das fitofisionomias do cerrado sentido restrito e em menor contribuição por espécies das formações florestais do bioma e espécies endêmicas de ambientes rupestres. A riqueza e a diversidade de espécies estão dentro dos limites normalmente encontrados para as áreas de cerrado sentido restrito do Brasil Central. Em termos estruturais, a densidade e área basal se assemelham aos valores registrados na subdivisão fitofisionômica de cerrado ralo. As condições ambientais limitantes, principalmente edáficas, não resultaram em mudanças expressivas na composição florística, riqueza e diversidade de espécies, mas refletiram em redução da densidade e área basal da vegetação arbustivo-arbó...

³ 15 cm found within 36 quadrats of 30 x 10 m was sampled. 172 species of trees belonging to 133 genera and 61 families were registered. The floristic profile showed strong links with both the Amazonian and Atlantic (sensu lato) forests, reinforcing the transitional nature of that community. The most important tree species, in terms of value of importance, were also important in other surveys carried out in the region.]]>

SignificanceIdentifying and explaining regional differences in tropical forest dynamics, structure, diversity, and composition are critical for anticipating region-specific responses to global environmental change. Floristic classifications are of fundamental importance for these efforts. Here we provide a global tropical forest classification that is explicitly based on community evolutionary similarity, resulting in identification of five major tropical forest regions and their relationships: (i) Indo-Pacific, (ii) Subtropical, (iii) African, (iv) American, and (v) Dry forests. African and American forests are grouped, reflecting their former western Gondwanan connection, while Indo-Pacific forests range from eastern Africa and Madagascar to Australia and the Pacific. The connection between northern-hemisphere Asian and American forests is confirmed, while Dry forests are identified as a single tropical biome.

Influence of edaphic variables on the floristic composition and structure of the tree-shrub vegetation in typical and rocky outcrop cerrado areas in Serra Negra, Goiás State, Brazil ABSTRACT -(Influence of edaphic variables on the floristic composition and structure of the tree-shrub vegetation in typical and rocky outcrop cerrado areas in Serra Negra, Goiás State, Brazil). The present study analyzed the influence of edaphic variables on the floristic compositions and structures of the arboreal and shrub vegetation of typical cerrado (TC) and rocky outcrop cerrado (RC) communities in the Serra Negra mountain range in Piranhas Municipality, Goiás State, Brazil. Ten 20 × 50 m plots were established in each community, and all individuals with minimum diameters ≥ 5 cm measured at 30 cm above soil level were sampled. Composite soil samples were collected at 0-20 cm depths in each plot for physical and chemical analyses. The proportions of above-ground rock cover work also estimated in each RC plot. A total of 2,009 individuals (83 species, 69 genera, and 34 families) were recorded. Qualea parviflora was the only species consistently among the 10 most structurally important taxa in both communities, and was considered a generalist species. The observed and estimated species richnesses were greater in RC than in TC, although plant basal areas and heights did not differ between them. There were positive correlations between rock cover × plant density and rock cover × basal areas. TWINSPAN and PCA analysis separated the TC and RC plots, and three RC habitat specialist species (Wunderlichia mirabilis, Norantea guianensis, and Tibouchina papyrus) were identified. Soil variables were found to have greater effects on the species compositions of the TC and RC sites than the geographic distances between sampling plots. According to CCA analysis, the exclusive (or more abundant species) of each community were correlated with soil variables, and these variables therefore determined the selection of some species and influenced the differentiation of the vegetation structures of the communities studied.

No abstract

-(Changes in the floristics and structure in the tree community in a valley forest of the Chapada dos Guimarães National Park, Mato Grosso State, Brazil). The objective of this study was to describe the changes in the floristic composition and community structure of the tree-shrub layer in the valley forest in the Chapada dos Guimarães National Park in Mato Grosso State, Brazil. The data were collected in three parallel transects, systematically distributed and equidistant on both sides of the stream. The tree layer (diameter at the breast height ≥ 5 cm) was surveyed in 1996 and 1999 in 18 plots of 600 m 2 each. The saplings (diameter at the breast height ≥ 1 cm and < 5 cm) and juveniles (total height ≥ 30 cm and diameter at the base of at least < 1 cm) were surveyed in 1999 and 2001 in 36 plots of 50 and 6 m 2 respectively. The high species richness, a total of 212 species, was probably due to the inclusion of saplings and juveniles along with the tree layer. The change in floristic composition was small and gains and losses were limited to those species with low abundance (< 3 individuals). These changes did not reflect significant changes in diversity. The size distribution, height and diameter, did not differ between sampling dates indicating a relative stability in this forest. However the apparent floristic and community stability should not be interpreted as indicating that the forest is at climax since changes are occurring in both time and space.Key words -community dynamics, demographic changes, diversity changes, floristic changes RESUMO -(Mudanças florísticas e estruturais na comunidade arbórea de uma floresta de vale no Parque Nacional da Chapada dos Guimarães, Mato Grosso, Brasil). O objetivo deste estudo foi descrever as alterações na composição florística e na estrutura da comunidade arbóreo-arbustiva da floresta de vale do Véu de Noiva, Parque Nacional da Chapada dos Guimarães, Mato Grosso. O estudo foi conduzido em três transeções paralelas, distribuídas de forma sistemática e eqüidistante, em ambas vertentes do vale. Para árvores (diâmetro à altura do peito -DAP ≥ 5 cm) o levantamento foi realizado em 1996 e 1999 em 18 parcelas de 600 m 2 , e para as arvoretas (1 ≥ DAP < 5 cm) e juvenis (altura ≥ 30 cm e DAP < 1 cm) em 1999 e 2001 em 36 subparcelas de 50 e 6 m 2 , respectivamente. A alta riqueza florística registrada (212 espécies) está associada ao fato de terem sido computados juntos as árvores, arvoretas e juvenis. A mudança na composição florística foi pequena, com perdas e ganhos se limitando às espécies amostradas com baixa abundância (< 3 indivíduos). Estas alterações não refletiram em mudanças significativas nos índices de diversidade. As distribuições de indivíduos nas classes de diâmetro e altura não diferiram significativamente entre os anos, indicando que a estrutura se manteve estável. No entanto, a aparente estabilidade florística e estrutural não deve ser interpretada como sendo a floresta do Véu de Noiva uma comunidade estática, pois mudanças estão acontecendo constant...

structure of woody vegetation of a "cerrado rupestre" area in Serra de Caldas Novas State Park, Goiás. Biota Neotrop. 10(2): http://www. biotaneotropica.org.br/v10n2/en/abstract?article+bn04010022010.Abstract: (Floristic and structure of woody vegetation of a "cerrado rupestre" area in Serra de Caldas Novas State Park, Goiás): The cerrado stricto sensu is the predominant phytophisiognomy of the Cerrado biome, covering large areas of the Brazilian Central Plateau. When the vegetation grows on rocky soils, it is known locally as "cerrado rupestre". Our knowledge of the tree-shrub communities of this Cerrado vegetation subtype is very limited. The aim of this study was to analyze the floristic composition and structure of tree-shrub vegetation in an area of cerrado rupestre located in the Serra de Caldas Novas State Park (PESCAN), Goiás, Brazil, and to compare the floristic and structural characteristics with those from other areas of cerrado stricto sensu located in Central Brazil. We sampled all individuals with a diameter ≥ 5 cm at 30 cm above ground level, presented in 10 randomly plots of 20 × 50 m. The floristic richness survey revealed 66 species, distributed in 53 genera and 31 botanical families. The studied vegetation had floristic and structural characteristics similar to those recorded in other areas of cerrado stricto sensu growing on deep soils, however, there were some species typically of cerrado rupestre, such as Schwartzia adamantium (Cambess.) Gir. ) as well as the abundance of large individuals of species such as Sclerolobium paniculatum Vogel, Pterodon pubescens (Benth.) Benth., S. adamantium and P. confertiflora. Hence, the flat soil surface of cerrado rupestre of PESCAN did not limit the growth of wood vegetation, nor conditioned the establishment of a distinguished flora. Nevertheless, the elevated structural importance of few wood species typical and adapted of rock environments guarantee some floristic peculiarity of the community survey. Keywords: rock outcrops, Central Brazil, phytossociology, savanna. LIMA, T.A., PINTO, J.R.R., LENZA, E. & PINTO, A.S. Florística e estrutura da vegetação arbustivo-arbórea em uma área de cerrado rupestre no Parque Estadual da Serra de Caldas Novas, Goiás. Biota Neotrop. 10(2): http://www.biotaneotropica.org.br/v10n2/pt/abstract?article+bn04010022010.Resumo: (Florística e estrutura da vegetação arbustivo-arbórea em uma área de cerrado rupestre no Parque Estadual da Serra de Caldas Novas, Goiás): O cerrado sentido restrito é a fitofisionomia predominante do bioma Cerrado, ocupando grandes extensões do Planalto Central brasileiro. Quando essa vegetação se desenvolve sobre Neossolos Litólicos recebe a denominação de cerrado rupestre. O conhecimento sobre as comunidades arbustivo-arbóreas deste subtipo fitofisionômico do Cerrado é muito limitado. O objetivo deste estudo foi analisar a composição florística e a estrutura da vegetação arbustivo-arbórea em uma área de cerrado rupestre localizada no Parque Estadual da Serra de Caldas Novas (PESCAN), Goiás, Brasil ...

O objetivo deste estudo foi descrever a riqueza, estrutura e diversidade de espécies arbóreas em áreas de Floresta Estacional e ecótono (Floresta Estacional/Floresta Ombrófila) no estado do Tocantins, buscando subsídios para a conservação, manejo florestal, compensação de reserva legal e recuperação ambiental, além de discutir as identidades fitogeográficas em comparação com outras florestas do Brasil. Em 18 bacias hidrográficas, conduziu-se amostragem da vegetação arbórea (DAP > 5 cm) de 22 áreas (amostras) por meio do inventário de 477 parcelas de 400 m². Foram elaboradas análises de classificação pelo método TWINSPAN, em duas escalas distintas. A primeira avaliou a diversidade beta entre as parcelas amostradas no estado do Tocantins e a segunda buscou analisar a similaridade das florestas do Tocantins em relação a outras florestas do bioma Cerrado e suas áreas de tensão ecológica. As florestas amostradas apresentaram ampla variação em termos de riqueza (33 a 243 espécies), densidade (486 a 1.179 ind.ha-1), área basal (14,04 e 37,49 m².ha-1), índices de diversidade (H´ = 2,75 a 4,59) e de equabilidade (J´= 0,72 a 0,86). As análises de classificação convergiram para resultados comuns, identificando quatro ambientes dissimilares em termos florísticos e estruturais no estado do Tocantins: Floresta Estacional Decidual, Floresta Estacional Semidecidual, ecótono Floresta Estacional Semidecidual/Floresta Ombrófila e ecótono Floresta Estacional Decidual/Floresta Ombrófila. A fim de manter a diversidade de plantas e de ambientes na região de transição Floresta Amazônica e Cerrado, sugere-se que o processo de criação de unidades de conservação no estado do Tocantins deva ser intensificado e tenha como base para seleção das áreas critérios biogeográficos.