Consulta: creatorFacets:"Vibrans,Alexander Christian"
Registros recuperados: 5
Data/hora: 16/06/2024 08:43:03

The last giant Araucaria trees in southern Brazil
Provedor de dados: Scientia Agricola
Autores: Scipioni,Marcelo Callegari; Dobner Jr.,Mário; Longhi,Solon Jonas; Vibrans,Alexander Christian; Schneider,Paulo Renato.
ABSTRACT: Araucaria angustifolia (Bertol.) Kuntze is a native tree species of major importance in southern Brazil. It is a regional symbol due to its iconic shape and stature in the landscape; its wood was once economically important and its seeds are an important source of food for the fauna and are presently used in regional cuisine. Despite its importance and apparent abundance, the species is facing extinction mainly as a result of unregulated exploitation and deforestation. This study catalogued the remaining individuals in order to add to the body of knowledge available on A. angustifolia, a species that has become rare across its historic range. The circumference at breast height (1.30 m), the total height, and the tree volume were measured (3,529...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Giant tree; Large old tree; Monumental trees; Cavities trees; Araucaria forest.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300220

Insights from a large-scale inventory in the southern Brazilian Atlantic Forest
Provedor de dados: Scientia Agricola
Autores: Vibrans,Alexander Christian; Gasper,André Luís de; Moser,Paolo; Oliveira,Laio Zimermann; Lingner,Débora Vanessa; Sevegnani,Lucia.
ABSTRACT: A key issue in large-area inventories is defining a suitable sampling design and the effort required to obtain reliable estimates of species richness and forest attributes, especially in species-diverse forests. To address this issue, data from 418 systematically distributed 0.4 ha plots were collected. Estimators of nonparametric species richness were employed to assess the floristic representativeness of data collected in three forest types in the Brazilian Atlantic Forest. The sampling sufficiency of forest attributes was evaluated as a function of sample size. Altogether, 831 tree/shrub species were recorded. The data acquired through the systematic sampling design were representative of both species richness and basal area. The confidence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest attributes estimation; Species richness; Forest monitoring; Systematic sampling; Secondary forests.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101000

Inventário de Dicksonia sellowiana Hook. em Santa Catarina
Provedor de dados: Acta Botanica Brasilica
Autores: Gasper,André Luís de; Sevegnani,Lucia; Vibrans,Alexander Christian; Uhlmann,Alexandre; Lingner,Débora Vanessa; Verdi,Marcio; Dreveck,Susana; Stival-Santos,Anita; Brogni,Eduardo; Schmitt,Ronnie; Klemz,Guilherme.
A intensa exploração comercial de Dicksonia sellowiana a deixaram na categoria de ameaçada de extinção, sendo incluída na lista brasileira de espécies da flora ameaçada de extinção. Por isso, o presente trabalho visa apresentar o estudo da distribuição das populações de D. sellowiana para apontar os locais de maior ocorrência da espécie em Santa Catarina, e avaliar a relação da densidade populacional com fatores ambientais, como altitude e clima. Foram instaladas 225 unidades amostrais, com 4.000 m² nas regiões do planalto e oeste catarinense, baseadas na grade de 10 km x 10 km conforme procedimento do Inventário Florístico Florestal de Santa Catarina. Nestas 225 unidades amostrais, D. sellowiana foi encontrada em 94, com variação de um a 391 indivíduos. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floresta Ombrófila Mista; Dicksoniaceae; Xaxim-bugio; Distribuição geográfica; Estrutura populacional; Ameaça de extinção.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000400005

Toward a better understanding of the subtropical Atlantic Forest in the state of Santa Catarina, Brazil: tree sampling accuracy, species richness and frequency of rare species
Provedor de dados: Acta Botanica Brasilica
Autores: Rezende,Vanessa Leite; Eisenlohr,Pedro V.; Gasper,André Luís de; Vibrans,Alexander Christian; Oliveira-Filho,Ary Teixeira de.
Accurate knowledge of floristic composition is crucial when planning and designing research projects and public policies. In this study, our goal was to assess tree sampling accuracy and to identify sites with higher concentrations of rare tree species, as well as those with the highest tree species richness, in the state of Santa Catarina, Brazil. We determined sampling accuracy using the first-order jackknife and Chao 2 estimators, calculated the number of rare species (singletons and doubletons) and applied sampled-based rarefaction. We found that sample accuracy (estimated vs. observed values) was over 90% for the state as a whole, the best estimates having been obtained for the areas of rain forest (first-order jackknife: 91%; Chao 2: 95%). Of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chao 2; Rainforest; First-order jackknife; Rare species; Semideciduous forest.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300011

HEIGHT-DIAMETER MODELS FOR THREE SUBTROPICAL FOREST TYPES IN SOUTHERN BRAZIL
Provedor de dados: Ciência e Agrotecnologia
Autores: Vibrans,Alexander Christian; Moser,Paolo; Oliveira,Laio Zimermann; Maçaneiro,João Paulo de.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tree height prediction; H-d relationship; Forest inventory; Regression assumptions; Model calibration.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000300205