Influência do tipo de solo na densidade de madeira e IMA de dois clones comerciais de eucalipto

Abstract

In forest plantations, the productive potential of a given site is the result of the interaction between genetic materials and environmental conditions. Both are fundamental factors for the wood quality and the average annual increment. Knowing the performance of different Eucalyptus urophylla commercial clones under different soil conditions is important for forest planning. Our objective is to evaluate the influence of soil types on wood basic density and Average Annual Increment (AAI) in two E. urpophylla clones. We analyzed the wood basic density in trees at 5-6 years of age and the AAI of the two clones grown in four soil types in 14 localities of São Paulo state. ANOVA and Tukey test at 5% probability were performed to test the effect of soil type in the basic wood density and the AAI. Linear and exponential regression equations were performed between AAI x wood basic density and between AAI x Clay Content, respectively. In general, some soils showed significant differences in wood basic density, which may be due to climatic variation among sites. Also, the AAI increased exponentially with the increase of soil clay content (up to about 25 to 35% of clay), but there was no correlation between AAI and wood density.