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      Caracterização e atributos da vegetação herbácea em um fragmento de Caatinga no Estado de Sergipe, Brasil Translated title: Characterization and attributes of herbaceous vegetation in a Caatinga fragment in the State of Sergipe, Brazil

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          Abstract

          RESUMO Espera-se que variações nos fatores ambientais sejam responsáveis pela diversificação das plantas herbáceas na Caatinga. Nesta pesquisa, objetivou-se caracterizar a vegetação herbácea quanto à composição, similaridade e estrutura, em um fragmento de Caatinga em Poço Verde, Estado de Sergipe, Brasil. Além disso, avaliou-se a influência da precipitação na riqueza entre diferentes áreas de Caatinga. A amostragem foi realizada por meio de 30 subparcelas, além de coletas adicionais de plantas no seu entorno. Foram encontradas 80 espécies, sendo 43% típicas de áreas antropizadas de Caatinga. Entre as áreas de Caatinga, a precipitação não explicou a variação de riqueza; os valores de similaridade foram determinados pela heterogeneidade ambiental. A diversidade Shannon-Wiener e a equabilidade de Pielou encontraram-se dentro da faixa esperada para áreas antropizadas de Caatinga. Com base em evidências suportadas por outros estudos, acredita-se que a antropização modificou a estrutura e a composição da vegetação herbácea, razão pela qual se recomendam ações de conservação.

          Translated abstract

          ABSTRACT Variations in environmental factors are expected to be responsible for the diversification of herbaceous plants in the Caatinga (dry forest). We analyzed the composition, floristic similarity and structure of the herbaceous vegetation in a Caatinga fragment in the municipality of Poço Verde, Sergipe State, Brazil. In addition, the influence of precipitation on richness among different Caatinga areas was evaluated. We installed 30 subplots and the floristic composition was complemented by collections made around these subplots. A total of 80 species were found, of which 43% are typically from disturbed areas of Caatinga. Among the Caatinga areas, precipitation did not explain the variation of richness; similarity values were determined by environmental heterogeneity. The parameters of Shannon-Wiener diversity and Pielou's evenness were within the range expected for Caatinga disturbed areas. Based on evidence supported by previous studies, we believe that human disturbance influences the composition and the structure of the studied herbaceous vegetation. Therefore, conservation actions are recommended.

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          Köppen’s climate classification map for Brasil

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            The caatingas dominium

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              Mesoscale distribution patterns of Amazonian understorey herbs in relation to topography, soil and watersheds

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                hoehnea
                Hoehnea
                Hoehnea
                Instituto de Botânica (São Paulo, SP, Brazil )
                0073-2877
                2236-8906
                June 2018
                : 45
                : 2
                : 159-172
                Affiliations
                [3] Rio Largo orgnameUniversidade Federal de Alagoas orgdiv1Centro de Ciências Agrárias Brazil
                [2] São Cristóvão orgnameUniversidade Federal de Sergipe orgdiv1Programa de Pós-Graduação em Ecologia e Conservação Brazil
                Article
                S2236-89062018000200159
                10.1590/2236-8906-70/2017
                51c1ee86-c459-481a-af8d-52c14126d3a0

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

                History
                : 16 February 2018
                : 03 October 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 80, Pages: 14
                Product

                SciELO Brazil


                antropização,fitossociologia,florística,similaridade florística,floristic,floristic similarity,human disturbance,phytosociology

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