Volumetric and economic evaluation of Eucalyptus spp. Clones in high forest, coppice and native vegetation systems at the Gypsum Pole of Araripe - PE

Abstract

The objective of this work was to perform a silvicultural analysis of eucalyptus clones in the high forest, coppice, and native vegetation conduction systems to establish the best system; to recommend the clone of highest volumetric yield; to determine the Technical Rotation Age and perform an economic analysis of the coppice; to compare energy sources used in the region and indicate the most viable economically. The experiment was conducted at the Araripe Experimental Station of the Agronomic Institute of Pernambuco (IPA), in Araripina - PE. Fifteen Eucalyptus hybrids (treatments) clones were tested with 4 repetitions in a space of 3m x 2m, with 25 plants in the plot's useful area, which were also compared with native vegetation. All trees were rigorously measured by the Smalian formula. The experiment was performed in a completely randomized design. Treatment means were compared using the Scott-Knott test. Clone C39 (Hybrid of E urophylla) presented the highest productivity, estimated at 72.99 m3/ha/year in coppice, therefore lower, because when it is used in high forest, it obtained an estimated productivity of 166.17m3/ha/year. The Technical Rotation Age was 60 months. In the financial analysis of the systems, it was observed that high forest provides the highest revenue when compared with coppice. The Net Present Value (NPV) was positive in all interest rates considered. Clone C39 provides higher productivity in a shorter rotation time when compared with the Sustainable Forest Management Plans (PFMS) of the Caatinga. It is economically and environmentally viable, since its use as an energy source reduces the anthropic pressure on native vegetation for the same purpose, thus reducing its devastation.