Contribuição ao relacionamento de características pedológicas e topográficas com altura de Eucalyptus alba, na região de Santa Bárbara, Minas gerais
Palavras-chave:
capacidade produtiva, fatores bióticos, manejo florestal, produtividade eucaliptais, análise regressãoResumo
This study was carried out in Minas Gerais, Brazil, to determine the effects of topographic and edaphic variables on growth parameters of Eucaliptus alba (Rio Claro hybrid). Thirty-two plots averaging approximately 550 m2 were used to compare six-year-old trees on red-yellow latosol with seven-year-old trees on a red- yellow latosol and lithosol association mixed with a dark red latosol. The heights of the 10 to 15 dominant trees, and the DBH of all trees in each plot measured. Soil samples at 0 and 50 cm and topographic data were also collected for each plot. Results indicated that any variable affecting soil water retention capacity, and specifically slope, water availability, and the proportion of exchangeable aluminum influenced growth in height on both soils. Variables affecting height increases identified from surface soil samples were pH; phosphorus, calcium and potassium levels; and exchangeable calcium and magnesiun. Levels of organic material and aluminum saturation at 50 cm were also correlated with height.
The proposed models for predicting height proved to be applicable in areas of homogeneous soil types, but were of limited use in heterogeneous soils.
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