Curva de acumulação de espécies e suficiência amostral em florestas tropicais

Schilling, Ana Cristina; Batista, João Luı́s Ferreira

doi:10.1590/s0100-84042008000100016

Cited by 53 publications

(44 citation statements)

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“…included two species to the list of bryophytes reported by Costa (2014) for the Pará State, which happens to be of 333 species. In the study area, the species accumulation curve was not stabilized, but according to Schilling and Batista (2008) the use of this method in tropical forest is controversial, due to the high richness inherent to this environment. In accordance with Zartman and Nascimento (2006) and Zartman and Shaw (2006), the fragmentation causes loss of richness and diversity of bryophytes.…”

Section: Discussionmentioning

confidence: 99%

Bryophytes in fragments of Terra Firme forest on the great curve of the Xingu River, Pará state, Brazil 1 Part of Master's Dissertation of the first author.

et al. 2015

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Microclimatic conditions of tropical forest favour the high richness of bryophytes, which by being sensitive to environmental changes, are important indicators of habitat conditions. The aim of this study was to determine the richness and species composition of the bryophyte flora in fragments of terra firme forest on the great curve of the Xingu River, Pará state, Brazil. The collections were made in August and September 2012 in 14 fragments, in which were installed two plots per fragment, one at the edge and one inside, measuring 10 × 10 m each. The results showed 77 species in 45 genera and 18 families. Lejeunea setiloba Spruce and Marchesinia brachiata (Sw.) Schiffn. are new records for Pará state. The richness families in this study were the ones typically found in tropical forest surveys. A high richness of rare species in comparison to common ones, a pattern usually observed for plants in tropical forests was not reported in this study, probably due to historical fragmentation and disturbance in the area. The richness and species composition were determined mainly by the physiognomic characteristics of the studied forest fragments.Keywords: brioflora, Amazonian flora, liverworts, mosses. Briófitas em fragmentos florestais de terra firme na região daVolta Grande do Xingu, Pará, Brasil ResumoAs condições microclimáticas das florestas tropicais favorecem elevada riqueza de briófitas, que por serem sensíveis às alterações ambientais, são importantes indicadoras das condições dos habitats. O objetivo deste trabalho foi determinar a riqueza e a composição florística da brioflora de fragmentos florestais de terra firme na região da Volta Grande do Xingu, Pará, Brasil. As coletas foram realizadas em Agosto e Setembro de 2012, em 14 fragmentos e em cada um destes foram plotadas duas parcelas, uma na borda e outra no interior, medindo 10 × 10 m (cada). Foram registradas 77 espécies, distribuídas em 45 gêneros e 18 famílias. Lejeunea setiloba Spruce e Marchesinia brachiata (Sw.) Schiffn. são novos registros para o Pará. As famílias mais ricas neste estudo foram aquelas tipicamente encontradas em levantamentos em florestas tropicais. A elevada riqueza de espécies raras em comparação às comuns, padrão comumente reportado para plantas em florestas tropicais, não foi observada, provavelmente devido ao histórico de fragmentação e distúrbios na área de estudo. A riqueza e a composição de espécies foram determinadas principalmente pelas características fisionômicas dos fragmentos estudados.Palavras-chave: brioflora, flora da Amazônia, hepáticas, musgos.

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Section: Discussionmentioning

confidence: 99%

Bryophytes in fragments of Terra Firme forest on the great curve of the Xingu River, Pará state, Brazil 1 Part of Master's Dissertation of the first author.

et al. 2015

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“…tree height ranged from 3 m to 21 m, with a 9-m average (CV = 28%). The base area (17.34 m² ha Assuming that tropical forests have high floristic richness, the tree species-area curve cannot completely stabilize even with a large sample size unless a census is used (SCHILLING;. From 1-3 ha, the species-area curve tropical arboreal species richness reaches a stability asymptote (CONDIT et al, 1996;SCOLFORO et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Floristic, structural, and allometric equations to estimate arboreal volume and biomass in a cerradão site

Miguel

Rezende

Leal

et al. 2017

SCA

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This objective of this study was to characterize the floristic, structural, and ecological groups and to estimate the arboreal volume and biomass of a cerradão site in Palmas, Tocantins, Brazil. A forest inventory was conducted on 10.15 ha of the study area. Plots of 400-m 2 were used for systematic sampling. All standing trees (dead or alive) with a breast-height diameter (DHB) greater than 5 cm were identified and measured. Floristic diversity and horizontal structure were assessed using the Shannon and importance value indices, respectively. Forest vertical structure was classified into three stratata and the tree species were categorized into ecological groups. Ninety tree volumes were rigorously cubed and weighed. Fresh-and dry biomass were sampled and estimated. Mathematical models were applied and adjusted to estimate tree volume and biomass. It was observed that the species Myrcia splendens and Emmotum nitens and the families Fabaceae and Chrysobalanaceae were dominant in our study site. The pioneer (613 individuals ha -1 ) and climax (530 individuals ha -1 ) tree species group predominated. The floristic diversity index was estimated as 3.35 nats ind -1. The vertical structure analysis indicated fewer individuals in the superior stratum (13%) compared to the medium (63%) and inferior (24%) stratum. The Schumacher and Hall model showed better results with regard to estimated forest production. Forest volume and biomass estimates were 126.71 m³ ha -1 and 61.67 Mg ha -1 , respectively. The studied cerradão area had high floristic diversity and climax species predominated. Since this cerradão is in close proximity to the Amazon biome, its volume and biomass stocks were higher than those estimated for other cerradão and forest formations within the Cerrado biome. Key words: Brazil. Cerrado Biome. Forestry inventory. Ecological group. Production. ResumoO objetivo do estudo foi caracterizar a florística, a estrutura, o grupo ecológico e estimar os estoques de volume e biomassa arbórea em uma área de 10, 15 hectares de cerradão, localizado no município de Palmas, Estado do Tocantins, utilizando a amostragem sistemática com parcelas de 400 m². Foram amostradas e identificadas todas as árvores vivas e mortas em pé, com diâmetro a 1,3 metros do solo ≥ 5 cm. A diversidade florística foi avaliada pelo o índice Shannon e a estrutura horizontal pelo o Índice de Valor de Importância. Quanto a estrutura vertical, a floresta foi classificada em três estratos.

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“…Such value is higher than the value found by Pires-O' Brien and O'Brien (1995), which suggest that the minimum area sampled in tropical forests shall include, at least, 90% of the community species sampled. However, tropical forests present high floristic richness, thus the species-area curve, in general, is not able to stay fully stabilized, even with large sample intensities, unless a census is carried out (SCHILLING;BATISTA, 2008;OLIVEIRA et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Floristic-Structural Characterization and Successional Group of Tree Species in the Cerrado Biome of Tocantins State, Brazil

et al. 2016

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-The objective of this study was to characterize the floristic composition, vegetation structure and ecological group of tree species in a cerradão forest (Cerrado biome) of Palmas, Tocantins State, Brazil. A forest inventory was performed in an area of 10.15 hectares, using systematic sampling with plots of 400 m², in which all standing trees, alive and dead, that had diameter at breast height (DBH) ≥ 5 cm were sampled and identified. A linear plateau regression model (LPR) was used for sample sufficiency analysis. The Shannon index (H') was used for assess the floristic diversity, and the Importance Value Index (IVI) for assess the horizontal structure. The forest was classified in three strata according to vertical structure analysis. The LPR showed that the sampling size was adequate. The predominate species in the area were Myrcia splendens, Emmotum nitens and Qualea parviflora, and species from the families Fabaceae and Chrysobalanaceae. The pioneer (613 individuals ha -1 ) and climax (530 individuals ha -1 ) species were the predominating groups. Regarding the richness index, the number of climax (57 species) and pioneer (25 species) species stood out. The alpha floristic diversity was 3.35 nats individuals -1 and the Pielou equability value J = 0.76. The diametric distribution showed a negative and balanced exponential pattern. Regarding the vertical stratification, the smallest amount of individuals was in the upper stratum (13%) and the highest in the mid stratum (63%) and in the lower stratum (24%). The use of floristic composition tools with horizontal and vertical structure analysis was effective for understand the tree community, which may be considered structured and diverse, thus able to restructure possible disturbances when preserved.Keywords: Floristic diversity. Phytosociology. Balanced forest. Ecological groups. CARACTERIZAÇÃO FLORÍSTICO-ESTRUTURAL E GRUPO SUCESSIONAL DE ESPÉCIES ARBÓREAS NO BIOMA CERRADO DO ESTADO DE TOCANTINS, BRASILRESUMO -Objetivo deste estudo foi caracterizar a composição florística, a estrutura da vegetação e os grupos ecológicos das espécies arbóreas em área de cerradão em Palmas, Tocantins. Foi realizado um inventário florestal em área de 10,15 hectares, utilizando amostragem sistemática com parcelas de 400 m², onde foram amostradas e identificadas todas as árvores vivas e mortas em pé, com DAP ≥ 5 cm. Na análise da suficiência amostral utilizou-se a regressão linear com resposta em platô (REGRELRP ). No quesito riqueza, as espécies clímax sobressaíram (57 espécies), pioneiras (25 espécies). A diversidade alfa florística foi de 3,35 nats indivívideos -1 e o valor de equabilidade de Pielou J = 0,76. A distribuição diamétrica apresentou comportamento exponencial negativo e balanceada. Em relação aos estratos verticais, a menor quantidade de indivíduos é encontrada no estrato superior (13%), a maior no estrato médio (63%) e o estrato inferior (24%). A área estudada foi caracterizada como estruturada e diversa conforme composição florística e fitossociológica en...

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Curva de acumulação de espécies e suficiência amostral em florestas tropicais

Cited by 53 publications

References 35 publications

Bryophytes in fragments of Terra Firme forest on the great curve of the Xingu River, Pará state, Brazil 1 Part of Master's Dissertation of the first author.

Bryophytes in fragments of Terra Firme forest on the great curve of the Xingu River, Pará state, Brazil 1 Part of Master's Dissertation of the first author.

Floristic, structural, and allometric equations to estimate arboreal volume and biomass in a cerradão site

Floristic-Structural Characterization and Successional Group of Tree Species in the Cerrado Biome of Tocantins State, Brazil

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