Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Análise das variações florísticas e estruturais da comunidade arbórea de um fragmento de floresta semidecídua às margens do rio Capivari, Lavras-MG.
AU - Souza, Josival Santos
AU - Espírito-Santo, Fernando Del Bon
AU - Fontes, M. A. L.
AU - Oliveira-Filho, A. T.
AU - Botezelli, L.
PY - 2003
Y1 - 2003
N2 - A study of the floristic and structural variations of a tree community was carried out in a tropical semideciduous forest fragment, located on the margins of the Capivari river, in Lavras, Minas Gerais, Brazil, to analyze the correlations between environmental variables (related to soil, topography and fragment shape) and the distribution of tree species. The study also aimed to increase the understanding on the floristic composition and phytosociological structure of tree communities in the upper Rio Grande region. Tree species were sampled in extensive collecting excursions as well as through 28 sample plots of 20 ´ 20 m, where all individuals with dbh ³ 5 cm were registered. The plots were distributed into five transects placed parallel to the predominant slope of each site. The environmental variables were obtained through a topographic survey of the fragment and chemical and textural analyses of soil samples. The correlations between the distribution of species abundance and environmental variables in the plots were assessed by canonical correspondence analysis (CCA). The floristic checklist contained 166 species, out of which 140 were found inside the sample plots. The tree community produced a high Shannon diversity index (H’ = 4.258 nats/individual), correlated to low ecological dominance (high Pielou evenness, J’ = 0.862), and possibly to high local environmental heterogeneity. The CCA showed that the environmental heterogeneity of the fragment is characterized mainly by the steep topography and by the variations in soil fertility, texture and ground water regime. The latter is most strongly correlated with the distribution of the tree species. The analysis indicated that many tree species in the fragment show preference for either of the following two habitats: the lower slope, with moister and more fertile soils; and the upper slope, with less moist and fertile soils, and more liable to edge effects.
AB - A study of the floristic and structural variations of a tree community was carried out in a tropical semideciduous forest fragment, located on the margins of the Capivari river, in Lavras, Minas Gerais, Brazil, to analyze the correlations between environmental variables (related to soil, topography and fragment shape) and the distribution of tree species. The study also aimed to increase the understanding on the floristic composition and phytosociological structure of tree communities in the upper Rio Grande region. Tree species were sampled in extensive collecting excursions as well as through 28 sample plots of 20 ´ 20 m, where all individuals with dbh ³ 5 cm were registered. The plots were distributed into five transects placed parallel to the predominant slope of each site. The environmental variables were obtained through a topographic survey of the fragment and chemical and textural analyses of soil samples. The correlations between the distribution of species abundance and environmental variables in the plots were assessed by canonical correspondence analysis (CCA). The floristic checklist contained 166 species, out of which 140 were found inside the sample plots. The tree community produced a high Shannon diversity index (H’ = 4.258 nats/individual), correlated to low ecological dominance (high Pielou evenness, J’ = 0.862), and possibly to high local environmental heterogeneity. The CCA showed that the environmental heterogeneity of the fragment is characterized mainly by the steep topography and by the variations in soil fertility, texture and ground water regime. The latter is most strongly correlated with the distribution of the tree species. The analysis indicated that many tree species in the fragment show preference for either of the following two habitats: the lower slope, with moister and more fertile soils; and the upper slope, with less moist and fertile soils, and more liable to edge effects.
KW - Tropical seasonal forest
KW - multivariate analysis
KW - species-environment relationship
KW - tree community and species diversity
KW - okay
U2 - 10.1590/S0100-67622003000200009
DO - 10.1590/S0100-67622003000200009
M3 - Journal article
VL - 27
SP - 185
EP - 206
JO - Revista Árvore
JF - Revista Árvore
IS - 2
ER -