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      INFLUÊNCIA DE VARIÁVEIS AMBIENTAIS SOBRE O PADRÃO ESTRUTURAL E FLORÍSTICO DO COMPONENTE ARBÓREO, EM UM FRAGMENTO DE FLORESTA OMBRÓFILA MISTA MONTANA EM LAGES, SC Translated title: INFLUENCE OF ENVIRONMENTAL VARIABLES ON THE TREE COMMUNITY STRUCTURE AND FLORISTIC PATTERNS IN A MONTANE ARAUCARIA FOREST FRAGMENT IN LAGES, SANTA CATARINA STATE

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          Abstract

          RESUMO O objetivo deste trabalho foi caracterizar a composição florística e a estrutura do componente arbóreo de um fragmento de Floresta Ombrófila Mista Montana e avaliar a influência de variáveis ambientais sobre os padrões encontrados. A área de estudo situa-se no município de Lages, SC, às margens do Rio Caveiras (27°51'19.20"S e 50°10'33,39"W). O levantamento da vegetação e das variáveis ambientais (características químicas e físicas dos solos, relevo e cobertura do dossel) foi realizado em 50 parcelas permanentes de 20x10 m, alocadas de forma sistemática estratificada no fragmento. Todas as árvores vivas com circunferência ≥ 15,7 cm (medidas a 1,30 m do solo - CAP) foram mensuradas (CAP e altura) e identificadas. Foi calculado o valor de importância (VI) das espécies encontradas, realizada a ordenação das parcelas em função da abundância das espécies, por meio da analise de NMDS (Nonmetric multidimensional scalling) e plotadas a posteriori as variáveis ambientais significativas no diagrama de ordenação. Foram amostrados 1.843 indivíduos, que totalizaram uma área basal de 36,45 m2/ha, distribuídos em 37 famílias botânicas, 63 gêneros e 92 espécies. As três espécies com os maiores valores de VI foram Araucaria angustifolia (Bertol.) Kuntze, Lithraea brasiliensis Marchand e Jacaranda puberula Cham. As variáveis que apresentaram maior correlação com a estrutura e a composição florística do componente arbóreo foram o pH, o desnível máximo da parcela e o teor de Mg.

          Translated abstract

          ABSTRACT This study aimed to characterize the floristic composition and structure of the tree component of a montane Araucaria Forest fragment and to assess the influence of environmental variables on the patterns observed. The study area was located in the municipality of Lages, Santa Catarina state, close to the margin of the Caveiras River. The vegetation and the environmental variables (physical and chemical soils characteristics, relief and canopy cover) were surveyed within 50, 20 x 10m, permanent plots allocated systematically stratified in the forest fragment. All trees with circumference at breast height (CBH) ≥ 15,7 cm were measured (CBH and height) and identified. The importance values (IV) of the found species were calculated, the plots and species were ordinated by an analysis of NMDS (Nonmetric Multidimensional Scaling), according to the abundance of species, and the significant environmental variables plotted "a posteriori" in the ordination diagram. One thousand, eight hundred and forty-three (1,843) individuals were sampled, which added up to a total basal area of 36.45 m2, distributed in 37 botanical families, 63 genera and 92 species. The three species with the highest values of VI were Araucaria angustifolia (Bertol.) Kuntze, Lithraea brasiliensis Marchand and Jacaranda puberula Cham. The variables that showed the higher correlation with the tree component structure and floristic composition were the pH, the plot highest declivity and the Mg content.

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          Most cited references32

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          Manual de Métodos de Análises de Solo

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            Estimating species richness using the jackknife procedure.

            An exact expression is given for the jackknife estimate of the number of species in a community and for the variance of this number when quadrat sampling procedures are used. The jackknife estimate is a function of the number of species that occur in one and only one quadrat. The variance of the number of species can be constructed, as can approximate two-sided confidence intervals. The behavior of the jackknife estimate, as affected by quadrat size, sample size and sampling area, is investigated by simulation.
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              Manual técnico da vegetação brasileira

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
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                Role: ND
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                Journal
                cflo
                Ciência Florestal
                Ciênc. Florest.
                Universidade Federal de Santa Maria (Santa Maria, RS, Brazil )
                0103-9954
                1980-5098
                March 2012
                : 22
                : 1
                : 79-90
                Affiliations
                [2] Lages Santa Catarina orgnameUniversidade do Estado de Santa Catarina Brazil carol_sil4@ 123456yahoo.com.br
                [5] Lages Santa Catarina orgnameUniversidade do Estado de Santa Catarina Brazil karynaflorestal@ 123456yahoo.com.br
                [1] Lages Santa Catarina orgnameUniversidade do Estado de Santa Catarina orgdiv1Departamento de Engenharia Florestal orgdiv2Centro de Ciências Agroveterinárias Brazil higuchip@ 123456gmail.com
                [3] Lages Santa Catarina orgnameUniversidade do Estado de Santa Catarina Brazil
                [4] Lages Santa Catarina orgnameUniversidade do Estado de Santa Catarina Brazil julianopgomes@ 123456yahoo.com.br
                Article
                S1980-50982012000100079
                10.5902/198050985081
                2fabe857-b1c9-42bb-b9f2-b77e2c086223

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 12
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                SciELO Brazil


                heterogeneidade ambiental,floresta de araucária,análise multivariada,environmental heterogeneity,araucaria forest,multivariate analysis

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