A new index for assessing the value of importance of species - VIS

Anais da Academia Brasileira de Ciências

Sylvio PÉllico Netto¹  Mauricio K. Amaral¹  Marcio Coraiola¹ 

关键词: light competition index;    phytosociological parameters;    Tropical Mixed Forest;    Native Forest;    Índice de competição por luz;    parâmetros fitossociológicos;    Floresta Estacional Semidecidual;    Floresta Nativa;   

DOI  :  10.1590/0001-3765201520140351

来源: SciELO

【 摘 要 】

ABSTRACT Phytosociological analysis in native forests is performed considering the horizontal and vertical structure of the studied population, whose most expressive parameters are the density, dominance, frequency, value of coverage and value of importance of species. Many phytosociological studies include a value of importance of species calculated by adding density, dominance and frequency, in their relative forms, however, this estimator is a mathematical impropriety because the result is a sum of indexes and does not express the true meaning of species' value. This is because the estimator is still influenced predominantly by the density of occurrence of species and cannot capture the relevant hierarchical participation of emerging species that occur with low density in the biocoenosis. In this work, we propose a new index to characterize the value of importance of species based on the hierarchy and spatial absolute probability of the species in the biocoenosis, illustrated with data from a forest fragment of semideciduous tropical forest located in Cassia, MG, Brazil. The new index appropriately expressed the importance of species in the evaluated fragment.

【 授权许可】

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