Título :	Relationships between structure of the tree component and environmental variables in a subtropical seasonal forest in the upper Uruguay River valley, Brazil
Autor :	Mélo, Máida Ariane de Budke, Jean Carlos Oliveira, Carlos Henke
Assunto::	Declive Drenagem Autocorrelação espacial Solos - análise
Fecha de publicación :	dic-2013
Editorial :	Sociedade Botânica do Brasil
Citación :	MELO, Máida Ariane de; BUDKE, Jean Carlos; HENKE-OLIVEIRA, Carlos. Relationships between structure of the tree component and environmental variables in a subtropical seasonal forest in the upper Uruguay River valley, Brazil. Acta Botanica Brasilica, Feira de Santana, v. 27, n. 4, p. 751-760, out./dez. 2013. DOI: https://doi.org/10.1590/S0102-33062013000400015. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400015&lng=en&tlng=en. Acesso em: 27 ago. 2020.
Abstract:	This study aimed to analyze relationships among the structure of the tree component, edaphic variables and canopy discontinuity along a toposequence in a seasonal upland (hillside) forest in southern Brazil. Soil and vegetation were sampled in 25 plots of 20 × 20 m each. We described the vegetation in terms of structure, richness and diversity, as well as by species distribution patterns. We evaluated canopy continuity, determined sloping and calculated spatial coordinates. We applied partial canonical correspondence analysis (pCCA) to determine whether species distribution correlated with environmental and spatial variables. We identified 1201 individuals belonging to 76 species within 30 families. The species with highest density and frequency were Gymnanthes concolor Spreng., Calyptranthes tricona D.Legrand, Eugenia moraviana O.Berg and Trichilia claussenii DC. The pCCAs indicated significant correlations with environmental and spatial variables. Sand content, boron content and soil density collectively explained 36.17% of the species matrix variation (total inertia), whereas the spatial variables x, y and xy² collectively explained 14.27%. The interaction between environmental and spatial variables explained nearly 4.5%. However, 45.05% remained unexplained, attributed to stochastic variation or unmeasured variables. Terrain morphology and canopy discontinuity had no apparent influence on richness, and changes in species distribution were correlated with sloping, which affects soil features and determines the directional distribution of some species.
Licença::	Acta Botanica Brasilica - (CC BY-NC) - All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Fonte: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400015&lng=en&tlng=en. Acesso em: 27 ago. 2020.
DOI:	https://dx.doi.org/10.1590/S0102-33062013000400015
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