Fernando Buzzi Júnior

Heterogeneidade florístico-estrutural do componente arbóreo em um sistema de fragmentos florestais no Planalto Sul catarinense

The goal of this study was to evaluate the spatial, floristic and structural variations of the tree component of a fragments system of Araucaria Forest in the uplands of the state of Santa Catarina, Brazil. For this sake, within four fragments, 50 parcels of 200 m2 (10 x 20 m) were allocated; their individuals with diameter at breast height (DBH), measured at 1.30 m height, > 5 cm, were identified and measured. The Importance Value Index was determined and the floristic-structural comparison among fragments was analyzed, applying a non-parametric multivariate analysis of variance (NPMANOVA). Indicator species of each fragment was determined by Indicator Species Analysis (ISA). We found 73 species, being Araucaria angustifolia (Bert.) Kuntze the most important species. There was a difference in the tree component structure of the fragments (p = 0.001); it is possible to identify indicator species for fragments 1, 2 and 3. This study showed that fragments located close to each other may present floristic-structural variations, which should be considered during strategies definition for forest management and conservation.

TREE COMPONENT DEMOGRAPHY IN AN UPPER MONTANE MIXED OMBROPHILOUS FOREST UNDER CHRONIC ANTHROPOGENIC DISTURBANCES

1 Received on 23.11.2015 accepted for publication on 31.05.2017. 2 Universidade do Estado de Santa Catarina, Programa de Pós-Graduação em Engenharia Florestal, Lages, Santa Catarina, Brasil. E-mail: <juli_ajuri@hotmail.com>,<a.line_cruz@yahoo.com.br> ,<chayanesouza8@gmail.com>,<mariele.ferrer@hotmail.com>, <vanessasoboleski@hotmail.com> and <rhodineli@hotmail.com>. 3 Universidade do Estado de Santa Catarina,Graduação em Engenharia Florestal,Lages, Santa Catarina, Brasil. E-mail: <fernandobuzzijunior@gmail.com>. 4 Universidade do Estado de Santa Catarina,Departamento em Engenharia Florestal, Lages, Santa Catarina, Brasil. E-mail: <carol_sil4@yahoo.com.br> and <higuchip@gmail.com>. *Corresponding author.

Heterogeneity of a Tree Species Community in an Alluvial Area of Santa Catarina, Brazil

The aim of the present study was to characterize the floristic-structural heterogeneity of the tree species in an alluvial forest remnant considering three sectors: forest-river edge, forest interior and forest/non-forest matrix edge. Forty-eight plots of 200 m2 were allocated and all tree individuals with a diameter at breast height (dbh) equal to or greater than 5 cm were measured and identified. Data was analyzed by Shannon’s diversity index, Pielou evenness and phytosociological descriptors. Plots were ordered through NMDS. Sixty-six species were sampled and Myrtaceae was found to be the richest family. Diversity and evenness reached 2.96 and 0.71, respectively. Sebastiania commersoniana (Baill.) L.B.Sm. & Downs presented the highest importance value (21.22%). The NMDS showed that tree components are spatially partitioned according to sectors, therefore indicating floristic-structural heterogeneity.

PARTIÇÃO DA VARIAÇÃO FLORÍSTICO-ESTRUTURAL DO COMPONENTE ARBÓREO EM UMA FLORESTA OMBRÓFILA MISTA ALUVIAL NO SUL DO BRASIL

This study aimed to evaluate the influence of spatial structure and environmental variables on floristic-structural organization of the tree component, in an Alluvial Araucaria Forest, in southern Brazil. To do so, 48 200 m 2 sampling units were allocated in the study area, located in the municipality of Lages, SC state. All trees within the sampling units, with diameter at breast height (dbh) equal to or greater than 5 cm were identified. The environmental and spatial variables were measured in each sampling unit. The data were analyzed through Mantel Correlogram, Variation Partitioning, Redundancy Analysis, analysis of Principal Coordinates of Neighbor Matrices and correlation tests. A total of 1,462 individuals, belong to 66 species, were sampled. Together, the environmental and spatial variables explained 24.13% of total variation, with the largest part (15.22%) being spatially structured. The significant environmental variables were topography (maximum elevation difference) and fertility (bases sum and P). It is possible to conclude that the tree component is organized as a floristic-structural gradient. Furthermore, the results suggest that the inundation regime and the presence of flood prone areas were relevant for micro-habitat definitions, that influenced the distribution of species

Partição de nicho por grupos funcionais de espécies arbóreas em uma floresta subtropical

This study aimed to investigate functional attributes of tree species along different topographic position, in a forest located in Upper Uruguay region, in Santa Catarina. The wood density (WD), potential height (Hmax), leaf area (LA), specific leaf area (SLA), leaves renovation regime, regeneration and dispersal guilds were determined for the 20 most abundant species in the sampled area. The functional structure was evaluated through a community weight matrix (CWM) of traits values for each sampling unit. Mean values of elevation, declivity and curvature were extracted for each sampling unit, from a Terrain Digital Model in a resolution of 1 m. The data was analyzed through linear correlations, Principal Coordinates Analysis (PCoA), Principal Components Analysis (PCA) and linear simple model. The results indicated significant and negative correlation between Hmax x LA and Hmax x SLA. The topographic gradient significantly influenced the functional structure of tree component. It is concluded that the occupation of different positions along the topographic gradient and the forest vertical profile by tree species were mediated by different ecological strategies.

FLORISTIC COMPOSITION AND PHYTOGEOGRAPHY CONTEXTUALIZATION OF THE NATURAL REGENERATION OF AN ALLUVIAL FOREST LOCATED IN THE "PLANALTO SUL CATARINENSE" REGION, SC, BRAZIL1

1 Received on 07.10.2014 accepted for publication on 11.11.2016. 2 Universidade do Estado de Santa Catarina, Programa de Pós-Graduação em Engenharia Florestal,Lages, SC Brasil. Email: <jessica.oneda@hotmail.com>, <a.line_cruz@yahoo.com.br> and <tiagoferreira@florestal.eng.br>. 3 Universidade do Estado de Santa Catarina, Departamento de Engenharia Florestal, Lages, SC Brasil. <carol_sil4@yahoo.com.br> and <higuchip@gmail.com>. 4 Universidade do Estado de Santa Catarina, Departamento de Solos e Recursos Naturais, Lages, SC Brasil. <alvaro.mafra@udesc.br>. 5 Universidade do Estado de Santa Catarina, Graduando em Engenharia Florestal, Lages, SC Brasil. <fernandobuzzijunior@gmail.com> and <angelica.dalla.rosa@hotmail.com>. *Corresponding author.

DISTRIBUIÇÃO E RIQUEZA DE ESPÉCIES ARBÓREAS RARAS EM FRAGMENTOS DE FLORESTA OMBRÓFILA MISTA AO LONGO DE UM GRADIENTE ALTITUDINAL, EM SANTA CATARINA

The present study aimed to analyze how the distribution and the richness of rare tree species occur along an altitudinal gradient, in Araucaria Forests fragments. For this purpose, tree species (diameter at breast height > 5 cm) were sampled in 10 forest fragments located on different altitudinal floors in “Planalto Sul-Catarinense” region, totaling 10 ha of sampling area. The species with only one or two individuals in at least one fragment were classified as rare. The species distribution was verified by a dendrogram constructed through the Jaccard floristic distance index and the UPGMA clustering algorithm. The total species richness per fragment and the number of rare species were compared among montane and upper-montane sub-formation by the Mann-Whitney (U) test. The relationship between altitude and values of total richness and number of rare species in each fragment were determined by simple linear regressions. The results indicated the formation of two groups of rare species, in function of the altitude floor. Despite the fact that total richness of communities decreased with increasing altitude, the number of rare tree species did not significantly change. We conclude that in the “Planalto Sul-Catarinense” region, the fragments of Araucaria Forest have different set of rare tree species according to altitude and that the reduction of the richness of communities with increasing altitudinal floor is not accompanied by a reduction in the number of rare species.

Similaridade florística das florestas superomontanas no domínio Atlântico, Brasil

This study investigated the floristic similarity of the tree component of 39 upper montane forest fragments in Atlantic domain, Brazil, and the influence of geographic and climatic variables on the patterns observed. It was created a binary matrix of presence and absence of the tree species compiled from the 39 floristic and phytosociological survey. For the relationship of the floristic composition of the areas with the environmental and spatial variables, the geographic coordinates and climate data of each area were extracted. The floristic similarity of the fragments was measured using a dendrogram and for determination of environmental and spatial variables influence on floristic patterns, a nonmetric multidimensional scaling analysis (NMDS) was used. The dendrogram analysis and the NMDS showed the formation of clusters, predominantly among fragments located in the same phytogeographic unit. The existence of an environmental gradient based on the climatic conditions was observed. In areas with higher thermal seasonality, annual temperature range, precipitation, latitude and longitude, upper montane forests with rain forest matrix occurred, and in areas with higher average temperature, daily temperature range, isothermality, seasonality of precipitation and minimum temperature in the coldest month, upper montane forests with seasonal matrix occurred.