Comparação entre a produtividade e análise econômica de clones de Eucalyptus spp. em sistemas de alto fuste e talhadia no Polo Gesseiro do Araripe - PE

Abstract

The aim of this work was compare and evaluate the productivity, mean annual increment (MAI), survival and mortality of 15 clones of Eucalyptus conducted in two systems: tall trees and coppice; recommend which clones have higher volumetric yields to supply the energetic matrix of the region; define the best system; compare the volume of tall trees regime with coppice and native vegetation; to define the technical rotation age; perform financial analysis of coppice; compare energy sources used in the region and indicate the clone most economically viable. The experiment was conducted in Araripe Experimental Station of the Agronomic Institute of Pernambuco (IPA) in Araripina - PE. It was tested 15 treatments represented by clones of the Eucalyptus hybrids with four repetitions in spacing of 3.0 m x 2.0 m, with 25 plants in the useful area of the plot. The trees were rigorously measured by the Smalian method in both systems. The statistical procedure was performed by a completely randomized design. The treatment means were compared by the Scott-Knott test at 5% probability that separated the 15 clones into three groups. The highest production was obtained with the clone C39 (E. urophylla hybrid) with 72.99 m3/ha, but this volume in coppice was lower than in tall trees. The technical rotation age was 60 months. According to the financial analysis of the systems, it was decided that the tall trees at 60 months has increased revenue and volume when compared to coppice. Both presented better results than the native forest. The net present value (NPV) was positive in four considered interest rates. Eucalyptus spp. compared to sustainable forest management plans of Caatinga (PFM) has increased productivity in a shorter rotation, it is economically and environmentally viable because its use as an energy source reduces the use of native vegetation for the same purpose, thus reducing the devastation of the native vegetation.