Vegetation science concepts I. Initial floristic composition, a factor in old-field vegetation development with 2 figs.

Egler, Frank E.

doi:10.1007/bf00275587

Cited by 1,122 publications

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“…Tropical forest succession is characterized by changes in species composition, from herbs, shrubs, vines and fast-growing pioneer tree species during the first 30 years, to long-lived pioneer trees and shade-tolerant species during the following 70-120 years (Finegan 1996). According to the initial floristic composition hypothesis (Finegan 1996;Uhl et al 1998;Guariguata & Ostertag 2001;Peñ a-Claros 2003), species representing all guilds colonize soon after disturbance but reach dominance at different times according to their growth rates and longevities (Egler 1954). Our results support this hypothesis and also agree with the consensus that species composition in forest succession is highly unpredictable (Chazdon 2008).…”

Section: Discussionmentioning

confidence: 99%

Forest structure and species composition along a successional gradient of Lowland Atlantic Forest in Southern Brazil

Marques¹,

Zwiener²,

Ramos³

et al. 2014

Biota Neotrop.

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MARQUES, C.M.M., ZWIENER, V.P., RAMOS, F.M., BORGO, M., MARQUES, R. Forest structure and species composition along a successional gradient of Lowland Atlantic Forest in Southern Brazil. Biota http://dx.doi.org/10.1590/1676-06032014009414Abstract: The Lowland Forest is one of the most disturbed and fragile ecosystems in the Atlantic Forest biome, yet little is known regarding its successional trajectory and resilience. We evaluated changes in species assemblages and forest structure of the canopy and understory along a successional gradient (young 21-yrs old forest, immature 34-yrs old forest and late successional 59-yrs old forest) aiming to assess changes in species composition and successional trajectory of different strata of secondary forests. A 0.1 ha plot (ten 10x10 m sub-plots) from each forest stand was surveyed for trees and shrubs with a diameter at breast height (DBH) > 4.8 cm (canopy) and for individuals with heights > 1 m and DBH , 4.8 cm (understory). A total of 3,619 individuals from 82 plant species were sampled. The successional gradient was marked by a unidirectional increase in species richness and a bidirectional pattern of density changes (increasing from young to immature forest and decreasing from immature to late successional forest). Community assemblages were distinct in the three forests and two strata; indicator species were only weakly shared among stands. Thus, each successional forest and stratum was observed to be a unique plant community. Our results suggest slight predictability of community assemblages in secondary forests, but a relatively fast recovery of forest structure. Keywords: canopy, chronosequence, Restinga, understory.MARQUES, C.M.M., ZWIENER, V.P., RAMOS, F.M., BORGO, M., MARQUES, R. Estrutura e composição ao longo de um gradiente sucessional de Floresta de Terras Baixas no sul do Brasil. Biota http://dx.doi.org/10.1590/1676-06032014009414Resumo: As Florestas de Terras Baixas constituem um dos ecossistemas mais perturbados e frá geis no bioma Mata Atlâ ntica, mas ainda pouco se sabe sobre sua trajetó ria sucessional e resiliência. Foram avaliadas alteraçõ es na composiçã o de espécies e a estrutura florestal do dossel e sub-bosque ao longo de um gradiente sucessional (floresta jovem-21 anos, floresta imatura-34 anos, floresta madura-59 anos) com o objetivo de verificar as mudanças na composiçã o de espécies e a trajetó ria sucessional de diferentes estratos destas florestas secundá rias. Uma parcela de 0,1 ha (dez sub-parcelas de 10x10 m) foi estabelecida em cada floresta, amostrando-se á rvores e arbustos com um diâ metro à altura do peito (DAP) > 4,8 cm (dossel) e para indivíduos com altura . 1 m e DAP , 4,8 cm (sub-bosque). Um total de 3.619 indivíduos de 82 espécies de plantas foram amostrados. O gradiente sucessional foi marcado por um aumento unidirecional na riqueza de espécies com o tempo, e um padrã o bidirecional de mudanças de densidade (aumentando da floresta jovem para a imatura e diminuindo da imatura para a madura). As assembléias de plantas eram dist...

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Section: Discussionmentioning

confidence: 99%

Forest structure and species composition along a successional gradient of Lowland Atlantic Forest in Southern Brazil

Marques¹,

Zwiener²,

Ramos³

et al. 2014

Biota Neotrop.

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“…For the herb layers, values are comparable high in the range of half-light to semi-shade plants, although the relative PAR transmittance to the ground is at very low levels in all groups. Values for mature forest ecosystem in the same region with comparable relative irradiance intensity for the herb layer exhibited clearly lower light indicator values, about 2-4 (Schmidt 2001(Schmidt , 2005Ebrecht 2005). The missing reflection of the low PAR transmittance to the ground by the herb layer is caused by scattered individuals of early successional species (Dölle et al 2008).…”

Section: Effects Of Successional Changes On Soil Chemical Properties mentioning

confidence: 92%

Impact of tree species on nutrient and light availability: evidence from a permanent plot study of old-field succession

Dölle

Schmidt

2008

Plant Ecol

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This paper compares vegetation composition, light availability, carbon and nutrient pools and Ellenberg indicator values among four old-field successional permanent plots that have received an initial treatment (ploughing, herbicide or sterilisation) prior to being left undisturbed in 1969, a second set of six plots received additional treatments (continued ploughing or mulching until 1982). On all plots species rich pioneer forests developed. Vegetation still varies among plots with different initial treatments: Sterilised plots can be distinguished from the others by dominance of Betula pendula, ploughed plots by Fraxinus excelsior, whereas herbicide-treated plots are intermediate with proportions of both species. By affecting light availability at the ground, tree species in turn influences ground vegetation and soil properties. Light availability turned out to be the dominant factor determining the composition of the vegetation in old-field succession.

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“…Este é conhecido como o modelo de "substituição de espécies" de Egler (1954), e se dá por estágios mais definidos e discretos. Assim, as espécies invadem lentamente a área disponível à colonização e facilitam o estabelecimento de outras espécies, pois agem como abrigo para vetores de dispersão, melhoram as condições de fertilidade do solo e fornecem habitats adequados ao recrutamento.…”

Section: Loschi R a Et Alunclassified

Variações florísticas e estruturais de uma voçoroca em Itumirim, Minas Gerais

Loschi

Pereira

Machado

et al. 2010

CERNE

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RESUMO:Objetivou-se com este trabalho conhecer e avaliar a composição florística, a estrutura e a diversidade das espécies em regeneração numa voçoroca em Itumirim, MG. A voçoroca possui uma área de 0,9 ha, e foi subdividida em três setores denominados como braços "A"; "B" e "C". Para o levantamento estrutural da vegetação foi empregado o método de agulha, sendo amostrados 574 pontos distribuídos sistematicamente pelos três braços. Cada ponto foi estratificado no terreno em função de um gradiente topográfico. A análise de espécies indicadoras (ISA) foi usada para dar suporte estatístico aos padrões observados. Foi realizado também um levantamento florístico com o propósito de registrar todas as espécies de hábito arbustivo-arbóreo ocorrentes na voçoroca. Por meio do levantamento estrutural verificou-se que as espécies do grupo das "graminóides" e "samambaias" dominaram amplamente todos os setores. A análise de espécies indicadoras realizada para cada um dos braços indicou que Ludwigia elegans (Cambess.) H. Hara apresenta alta fidelidade, e, portanto, pode ser considerada indicadora do setor baixada úmida para o braço "A" (p = 0,002). O grupo de espécies que compõem a guilda "samambaias" foi considerado indicador do terço superior do braço "C" (p = 0,038). No levantamento florístico, referente às espécies de hábito arbustivo-arbóreo, foram registradas nos três braços 73 espécies, distribuídas em 63 gêneros e 33 famílias botânicas. As famílias com maiores riquezas de espécies foram Fabaceae, Asteraceae, Melastomataceae e Myrtaceae, representando 46,6% do total de espécies registradas.Palavras-chave: Áreas degradadas, regeneração natural, método de agulha, fitossociologia, florística. FLORISTIC AND STRUCTURAL VARIATIONS OF A GULLY AT ITUMIRIM, MINAS GERAIS ABSTRACT: This work aimed at knowing and evaluating the florisitc composition, the strucuture and the diversity of the regenerating species in a gully at Itumirim, MG. The gully possesses an area of 0.9 ha and was subdivided into three sectors named as arms "A"; "B" and "C". For the structural survey of the vegetation the needle method was employed, i. e. , 574 points distributed systematically across the three arms were sampled. Each spot was stratified on the terrain as related to a topographic gradient. The indicator species analysis (ISA) was used to give statistical support to the standards found. A florisitic survey was also conducted with the purpose of recording all the species of shrub-tree life form ocorring in the gully

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Vegetation science concepts I. Initial floristic composition, a factor in old-field vegetation development with 2 figs.

Cited by 1,122 publications

References 0 publications

Forest structure and species composition along a successional gradient of Lowland Atlantic Forest in Southern Brazil

Forest structure and species composition along a successional gradient of Lowland Atlantic Forest in Southern Brazil

Impact of tree species on nutrient and light availability: evidence from a permanent plot study of old-field succession

Variações florísticas e estruturais de uma voçoroca em Itumirim, Minas Gerais

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