Consulta: creatorFacets:"Overbeck,Gerhard Ernst"
Registros recuperados: 8
Data/hora: 08/06/2024 11:56:11

Grassland vegetation sampling - a practical guide for sampling and data analysis
Provedor de dados: Acta Botanica Brasilica
Autores: Andrade,Bianca Ott; Boldrini,Ilsi Iob; Cadenazzi,Monica; Pillar,Valério D.; Overbeck,Gerhard Ernst.
ABSTRACT Grassland and savanna ecosystems are the original vegetation types of more than 30% of the Brazilian territory, but conservation and training of future professionals has largely focused on forests. In fact, no standard protocols exist for sampling grassland vegetation for environmental planning or licensing. Neglecting non-forest ecosystems may have deleterious consequences for the maintenance of biodiversity and the provisioning of ecosystem services. Herein, we provide practical guidelines on how to conceive and develop ecological studies of grassland vegetation for scientific, monitoring or technical purposes. Using examples mostly from southern Brazil, we explain and discuss the various components of the research process, from the question to...
Palavras-chave: Non-forest ecosystems; Plant community; Phytosociological studies; Quantitative analysis; Relevé; Vegetation survey.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400786

Functional patterns of tree communities in natural Araucaria forests and old monoculture conifer plantations
Provedor de dados: Acta Botanica Brasilica
Autores: Malysz,Marcelo; Müller,Sandra Cristina; Milesi,Silvia Vendruscolo; Santos,Anita Stival dos; Overbeck,Gerhard Ernst.
ABSTRACT A functional perspective of tree communities is helpful for understanding forest dynamics, especially vegetation recovery after other land uses. Knowledge about ecological filters and survival strategies of trees are also important for the restoration of degraded areas. This study aimed to evaluate the functional composition and structure of adult and regenerative components of natural Araucaria forests, Araucaria plantations and plantations of exotic Pinus in subtropical southern Brazil. Differences in functional diversity and functional richness, and in community weighted mean trait values, including leaf traits and reproductive traits, were analyzed. RLQ analysis was used to assess the association between community structure, plant traits and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria angustifolia; Atlantic Forest; Forest dynamics; Functional diversity; Functional patterns; Pinus sp.; Succession; Tree plantations.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400777

Conservation of species-rich subtropical grasslands: traditional management vs. legal conservation requirements in primary and secondary grasslands
Provedor de dados: Acta Botanica Brasilica
Autores: Torchelsen,Fábio Piccin; Cordero,Rodrigo León; Overbeck,Gerhard Ernst.
ABSTRACT Land-use change is the main cause of biodiversity losses, and for grasslands includes changes in management. The last 10 years has seen afforestation of traditionally grazed grasslands increase considerably in the understudied Serra do Sudeste region of the Brazilian Pampa, turning the region into a mosaic of tree plantations, natural ecosystems (partly in conservation areas without grazing management) and other land uses. We evaluated grassland plant community structure and composition in conservation areas considering two distinct types of land-use history and compared them to grasslands under traditional management. The study was carried out at 58 sites. Per site, three plots were established to sample the plant composition of the herbaceous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Conservation; Grazing; Pampa; Primary grassland; Secondary grassland; Species richness; Subtropical grasslands; Vegetation management.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000200342

Structure of the tree stratum of three swamp forest communities in southern Brazil under different soil conditions
Provedor de dados: Acta Botanica Brasilica
Autores: Mancino,Luciana Carla; Overbeck,Gerhard Ernst; Baptista,Luís Rios de Moura.
Restinga forests are commonly known to be plant communities rather poor in tree species. This study aimed to describe and explain the association between the floristic-structural similarities and the environmental conditions in three Swamp Restinga Forest communities in southern Brazil. In 13 plots of 100 m2 each, we sampled all individual trees (circumference at breast height &gt;12 cm and height ≥3 m). We collected soil samples in each plot for chemical and textural analyses. Phytosociological parameters were calculated and different structural variables were compared between areas. The density of individuals did not differ between areas; however, the maximum height and abundance of species differed between the site with Histosols and the other two sites...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic rainforest; Diversity; Floristic; Restinga; Soil.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000100030

Restoration of abandoned subtropical highland grasslands in Brazil: mowing produces fast effects, but hay transfer does not
Provedor de dados: Acta Botanica Brasilica
Autores: Thomas,Pedro Augusto; Overbeck,Gerhard Ernst; Müller,Sandra Cristina.
ABSTRACT Subtropical Campos Sulinos grasslands, in South Brazil, are among the most biodiverse grasslands of the world. As climatic conditions lead to high productivity, disturbance are critical to maintain their diversity. Long-term exclusion, on the other hand, leads to plant species losses and changes in composition. No studies on the restoration of these grasslands after abandonment exist to date. We tested combinations of restoration techniques with the aim of increasing plant diversity in an abandoned and species-poor grassland in the South Brazilian highland region. In a bi-factorial experiment, we tested the effects of two different frequencies of mowing and of hay transfer. Mowing reduced plant cover, vegetation height, and abundance of erect...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andropogon lateralis; Campos Sulinos; Highland grasslands; Reintroduction of management; Old-growth grassland; Species reintroduction.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300405

Soil seed bank in a subtropical grassland under different grazing intensities
Provedor de dados: Acta Botanica Brasilica
Autores: Silva,Graziela Har Minervini; Overbeck,Gerhard Ernst.
ABSTRACT Grazing is an important determinant for the composition and structure of grasslands; however, soil seed bank (SSB) response to grazing intensity is poorly investigated. We analyzed SSB richness and density in a subtropical grassland in southern Brazil with different forage offers (low, intermediate, high and very high), that is, contrasting grazing intensities. The SSB was evaluated by the seedling emergence method. We collected ten SSB samples at two layers (0-5 and 5-10 cm) in spring and autumn in each of grazing intensity treatments. We surveyed the established vegetation to assess its similarity with the SSB. Treatment effects were analyzed by Poisson regression while compositional differences were visualized by ordination. We found 103...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disturbance; Grassland management; Pampa; Plant community dynamics; Recovery potential; Resilience; Transient seed bank.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000200360

The seed bank of subtropical grasslands with contrasting land-use history in southern Brazil
Provedor de dados: Acta Botanica Brasilica
Autores: Vieira,Mariana de Souza; Bonilha,Camila Leal; Boldrini,Ilsi Iob; Overbeck,Gerhard Ernst.
The expansion of land use for agriculture is among the main reasons for the reduction of natural grasslands around the world, and little is known about the recovery potential of original native grassland vegetation from seed banks. The aim of this study was to assess the seed bank potential of grassland areas with or without history of cultivation in southern Brazil. Specifically, we aimed at evaluating if agricultural use allowed for the persistence of species typical of natural grasslands in soil seed banks. We analyzed seed banks in two areas with a history of cultivation and in two natural grasslands. Samples were collected in spring and autumn in order to assess transient and persistent components, and were characterized by density, richness, presence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campos Sulinos; Disturbance; Land use; Persistent seed bank; Recovery; Transient seed bank.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400543

Effect of high temperature on germination of four legumes from a forest-grassland mosaic in Southern Brazil
Provedor de dados: Biota Neotropica
Autores: Silveira,Fernanda Schmidt; Overbeck,Gerhard Ernst.
Passage of a fire can break dormancy of the seeds of many plant species in fire-prone ecosystems. This response to fire is especially well known for the Fabaceae family, but has been poorly studied in Southern Brazil. We collected seeds of four Fabaceae species present in grasslands-forest mosaics of Southern Brazil: Mimosa bimucronata, Desmodium barbatum, Sesbania virgata and Collaea stenophylla. Seeds were exposed to different heat treatments (exposure to 60° and 80 °C for 5 minutes, to 100 °C for 2 minutes, control without heat treatment); not all species were tested in all treatments. After the treatment, the seeds were kept in a germination chamber with a light period of 12/12 hours and temperature of 25 °C. Germinated seeds were counted every 2 days....
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Campos Sulinos; Ecophysiology; Fabaceae; Fire; Grassland; Heat shock.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000200331