Influência da floresta alterada na distribuição espacial de três espécies da Floresta Ombrófila Mista avaliada pela geoestatística

With the intensification of global warming, the occurrence of large-scale natural events is becoming even more common in tropical regions, which can impact the structure of plant communities. In this study, we evaluated the isolated and combined effects of an extratropical cyclone and the dominance of a native bamboo species (Merostachys skvortzovii) on floristic composition, diversity, demographic rates and the increment of trees in Atlantic Forest fragments in Southern Brazil. In 2014 (T1) and 2016 (T2), we sampled 56 plots of 200 m² for the effects of an extratropical cyclone in 2009 (T0). We also evaluated another 60 plots of the same size not in the direct path of this cyclone. Half of the plots in each group were covered by dense groupings of bamboos, as a result of past human activities, which could potentially limit natural regeneration. We observed an increase in richness and diversity indices (H 0 and 1/D) from the first (T0) to the following assessments (T1 an T2) on the sites affected by the cyclone, when compared to non-affected sites. After the cyclone, both density and basal area they decreased, but there was an increase in recruitment, mortality, turnover rates and basal area, as well as basal increment. The diameter increment on surviving individuals was higher in cyclone-affected sites than in nonaffected sites. Bamboo cover did not affect richness or demographic rates (except mortality between T0 and T1). Natural impacts of this nature can lead to significant alterations of demographic rates, allowing the input of new species and influencing the pace of demographic processes.

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“…; Amaral et al . ) due to the increase in understory light conditions (Campanello et al . ; Mähler Junior & Laroca ).…”

Section: Introductionmentioning

confidence: 99%

Effects of the occurrence of a cyclone and the dominance of a bamboo species on the dynamics of subtropical forest fragments

et al. 2019

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“…Neste sentido, a comunidade pioneira, ao fornecer novas condições ecológicas, especialmente, sombreamento (DURAES et al, 2014), caracteriza um típico modelo de facilitação ecológica, pelas alterações microambientais, como redução da radiação solar e evapotranspiração, mantendo as condições de umidade e temperatura (GUEVARA et al,1992;CALLAWAY;WALKER, 1997;HOLMGREN et al, 1997), favoráveis para o estabelecimento de espécies mais exigentes. Entretanto, ainda existe uma lacuna de informações científicas sobre as características das populações vegetais que ocorrem naturalmente em ambiente alterados (AMARAL et al, 2013), especialmente em formações de FOM, considerando os níveis alarmantes de perda de biodiversidade.…”

Section: Introductionunclassified

Dinâmica De Bracatingais Inequiâneos Sob Diferentes Condições Ambientais No Planalto Sul Catarinense

Ferreira

Gomes

Stedille

et al. 2017

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ResumoA dinâmica das populações de plantas em uma c omunidade explica as mudanças qualitativas e quantitativas que ocorrem na vegetação, em que o balanço entre o recrutamento e mortalidade determina o funcionamento e a complexidade local, contribuindo para o entendimento das relações entre população e o meio. Objetivou-se avaliar alterações na estrutura populacional de Mimosa scabrella Benth., quanto ao recrutamento, a mortalidade e o incremento em área basal em populações com diferentes idades e verificar suas relações com variáveis ambientais. As populações avaliadas estão inseridas no Planalto Sul Catarinense, sob os domínios da Floresta Ombrófila Mista Montana (FOM-M) e Alto-Montana (FOM-A). No ano de 2012, três parcelas permanentes (40x40 m) foram aleatoriamente alocadas em populações naturais, onde todos os indivíduos presentes foram mensurados quanto o diâmetro a altura do peito para adultos (DAP ≥ 5 cm) e diâmetro a altura do colo (DAC) para regenerantes (DAP < 5 cm), os quais foram remedidos no ano seguinte (2013). Para todas as populações foram avaliados o total de indivíduos, mortalidade, recrutamento e alterações na densidade, assim como a influência das variáveis ambientais (química do solo, declividade e abertura do dossel) sobre os valores de incremento em área basal (m 2 ha -1 ). As alterações sobre a distribuição diamétrica caracterizam o caráter pioneiro de Mimosa scabrella, evidenciando o efeito da cobertura do dossel na dinâmica destas populações. Características relacionadas às maiores altitudes (FOM-A) alteraram o comportamento da espécie, influenciando os processos de dinâmica, especialmente a mortalidade, que apresentou taxa média de 10,5%. Mesmo não sendo fatores limitantes para o desenvolvimento de Mimosa scabrella, a mesma apresenta resposta em termos de crescimento sob condições de fertilidade. Palavras-chave: Mimosa scabrella Benth.; distribuição diamétrica; mortalidade; área basal; heterogeneidade ambiental. Abstract Dynamic Mimosa scabrella Benth. populations of different ages under different environmental conditions in the SouthernPlateau of Santa Catarina. The dynamics of plant populations in a community explains the qualitative and quantitative changes that occur in the vegetation, where the balance between recruitment and mortality determines the local functioning and complexity, contributing to the understanding of the relationships between population and the environment. The objective was to evaluate changes in population structure of Mimosa scabrella, as the recruitment, mortality and increase in basal area in populations with different ages and verify its relationship with environmental factors. The populations evaluated are embedded in Plateau of Santa Catarina, in the Montane Araucaria Forest (FOM-M) and Highland Araucaria Forest (FOM-A). In 2012, three plots (40 x 40 m) were randomly allocated into natural populations, where all individuals present were measured as the diameter of the breast height for adults (DBH ≥ 5 cm) and diameter neck height for regenerating (DNH < ...

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“…The analysis of the spatial and the height distribution of plants in native environments is a valuable tool to the conservation of threatened species (Niklas et al, 2003;Almeida & Cortines, 2008;Carvalho et al, 2009;Santos et al, 2011;Amaral et al, 2013;Bruzinga et al, 2013). Such studies aid the identification of disturbances on the plant population structure and subsidize the construction of sustainable management plans and policies (Kanieski et al, 2012;Samaniego & Marquet, 2013;Garzon-Lopez et al, 2014;Zhang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Height Distribution of Harvested Rupestrian Field Species in Preserved and Cultivated Communities

et al. 2016

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This study aimed to compare the spatial and the height distribution of three plant species between two rupestrian field communities, one preserved (A) and the other cultivated (B). One 50 × 100 m plot was delimited in each community and the populations of Eremanthus incanus, Lychnophora pinaster and Vellozia caruncularis were assessed for height and spatial distribution (using the Ripleys's L-function). In community A, 4,098 individuals were counted, mostly L. pinaster, against 220 individuals in community B, prevailing E. incanus. An inverted-J pattern was observed for height distribution in both communities, however, with lower frequencies in B. Regular spatial distribution was found for E. incanus and V. caruncularis in community A, whereas the pattern for L. pinaster depended on the scale of analysis. The spatial distribution of all species differed between communities. The Ecological Park Quedas do Rio Bonito contributes to the conservation of these rupestrian field species.

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Influência da floresta alterada na distribuição espacial de três espécies da Floresta Ombrófila Mista avaliada pela geoestatística

Cited by 15 publications

References 21 publications

Effects of the occurrence of a cyclone and the dominance of a bamboo species on the dynamics of subtropical forest fragments

Effects of the occurrence of a cyclone and the dominance of a bamboo species on the dynamics of subtropical forest fragments

Dinâmica De Bracatingais Inequiâneos Sob Diferentes Condições Ambientais No Planalto Sul Catarinense

Spatial and Height Distribution of Harvested Rupestrian Field Species in Preserved and Cultivated Communities

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