Abstract

ZILLI RUIZ, Emilio Carlos et al. Diversity and phitosociology of Araucaria forest fragments in small rural property in the State of Paraná - Brazil. Investig. Agrar. [online]. 2019, vol.21, n.2, pp.81-92. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2019.diciembre.81-92.

The objective of this research was to analyze the floristic characteristics of six fragments of Mixed Ombrophylous Forest located in small rural properties located in Fernandes Pinheiro and to compare them in relation to alpha and beta diversity. Twenty-six plots of 2.000 m² were divided into 130 subplots of 400 m² distributed in six forest fragments. The phytosociological parameters and Shannon, Simpson and Pielou indexes of each fragment, as well as the Jaccard Coefficient to form groups at 50% of similarity were determined. The Shannon indices of the fragments were evaluated one by one by the Hutcheson's test. In total, 103 species of 69 genera and 35 families were recorded, with the most abundant families being Myrtaceae and Lauraceae. In the six fragments analyzed, Araucaria was not the main species, only in Fragment 6, the most degraded. Fragment 3, even though it is the smallest, presented the best results for biodiversity (S = 64 e H’ = 3,390). The Hutcheson test emphasized that Fragments 3 and 6 differ from the others, in the same way, the Jaccard coefficient also showed less floristic similarity between these two fragments in relation to the others. It is concluded that there is a high heterogeneity among forest fragments nearby, besides evidencing the disparity in relation to large remnants.

Keywords : Alpha and beta diversity; similarity; Hutcheson's test.

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