Como é a estrutura e a diversidade alpha e beta de matas de galeria inundáveis?
DOI:
https://doi.org/10.17648/diversitas-journal-v6i2-1496Abstract
ABSTRACT: In this work, a phytosociological survey was carried out in flooded gallery forests with the aim of evaluating the floristic composition, similarity and relationship of the community's distribution with the environmental variables. Alpha diversity was assessed by calculating the Shannon - Wienner index (H ') and the Pielou equity index (J'). Beta diversity between stretches of forest was verified by calculating the Sorensen similarity index - “Bray-Curtis”. To relate the community to the environmental variables, soil samples were collected for chemical and physical analysis, soil moisture and shading data in the plots by the Braun-blanquet method. To verify the correlation between species distribution and environmental and spatial variables, the Canonical Redundancy Analysis (RDA) was performed. The species that had the most importance was Richeria grandis Vahl. The Shannon-Weiner index (H ') ranged from 2.47 to 2.84 nats.ind-1, correlated with low ecological dominance (high Pielou equability (J'): 0.88 to 0.81). The Bray-Curtis index showed low floristic similarity, high beta diversity. Analysis of the RDA revealed that variations in vegetation were poorly explained (14%) by the environment and space. The large unexplained proportion (86%) reinforces the idea that stochastic patterns, advocated by the Neutral Theory, may prevail over environmental ones in the structuring of these gallery forests.
KEYWORDS: Multivariate analysis, forest islands, ecological conservation, Serra do Espinhaço.
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