Effects of canopy gaps, topography, and soils on the distribution of woody species in a Central Brazilian deciduous dry forest

• Published in: Biotropica Vol. 30; no. 3; pp. 362 - 375
• Main Authors: Oliveira-Filho, A.T. (Universidade Federal de Lavras, Brazil.), Curi, N, Vilela, E.A, Carvalho, D.A
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.09.1998; Association for Tropical Biology
• Subjects: Agricultural soils; basalt-related soils; BOSQUE TROPICAL; BRASIL; BRAZIL; BRESIL; canonical correspondence analysis; Canopy gaps; central Brazil; CIENCIA DEL SUELO; Deciduous forests; Dry forests; Forest soils; FORET TROPICALE; PLANTAS LENOSAS; PLANTE LIGNEUSE; Plants; SCIENCES DU SOL; Soil depth; Soil organic matter; SOIL PROPERTIES; Soil samples; SOIL SCIENCES; Soil water; SOL TROPICAL; SUELO TROPICAL; TOPOGRAFIA; TOPOGRAPHIE; TOPOGRAPHY; tropical dry forest; TROPICAL FORESTS; TROPICAL SOILS; WOODY PLANTS
• ISSN: 0006-3606; 1744-7429
• DOI: 10.1111/j.1744-7429.1998.tb00071.x

The interrelationships between the distribution of woody species and environmental variables were investigated in an area of deciduous dry forest in Santa Vitoria, central Brazil. This is the first study of a vanishing type of dry forest which grows on base-rich soils originating from the basalt bedrocks of southern Goias and western Minas Gerais. A survey of topography, soil properties, canopy gaps and woody plants (≥5 cm diameter at the base of the stem) was conducted in 50-15 x 15 m quadrats. The soils were classified into the following soil series: Hapludolls → Haplustolls → Ustropepts → Rhodustalfs. This series corresponded to a gradient of increasing elevation and effective soil depth and decreasing slope gradient, soil organic matter and total exchangeable bases. A canonical correspondence analysis and a detrended correspondence analysis indicated that plant species abundance distribution was significantly correlated with both the relative area of canopy gaps in the quadrats and the soil-topography gradient. Presumably, the critical factors involved in these two gradients are, respectively, light and ground water regimes. The influence of canopy gaps (i.e., light) was surprising and has not been documented previously for tropical deciduous dry forests.