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Estrutura e composição florística de dois fragmentos florestais na região do Baixo Jacuí, RS, Brasil

2000; UNIVERSIDADE FEDERAL DE SANTA CATARINA; Volume: 13; Issue: 2 Linguagem: Inglês

2175-7925

Rodrigo Agra Balbueno, Paulo Luiz de Oliveira,

Soil Management and Crop Yield

The effect of forest fragmentation was studied through the analysis of arboreal vegetation in two native forest fragments contigous to Eucalyptus reforestation areas in Baixo Jacui region, Rio Grande do Sul State, South Brazil: Horto Sao Pedro I (5.19 ha; municipal district of Sao Jeronimo) and Horto Santa Rosa (5.75 ha; municipal district of Arroio dos Ratos). The arboreal vegetation was studied by determining the value of importance using twelve 10 x 20 m juxtaposed plots in each fragment. All individuals with diameter of stem at breast height (DBH) equal or less cm were sampled and identified. The index of diversity of Shannon (H') and the indices of similarity of Jaccard and Sorensen were calculated. In the Horto Sao Pedro I fragment, 230 individuals of 24 species and 19 families were identified. The index of diversity of Shannon was 2.23 nats. In the Horto Santa Rosa fragment, 186 individuals of 32 species and 20 families were identified. The index of diversity of Shannon was 2.88 nats. In the Horto Santa Rosa fragment, 186 individuals of 32 species and 20 families were identified. The index of diversity of Shannon was 2.88 nats. The floristic similarity determined by the indices of Jaccard and Sorensen was 0.19 and 0.24, respectively, with nine species common to both fragments.