Produtividade de um clone de Eucalyptus urophylla em função do espaçamento na região do Polo Gesseiro do Araripe

Abstract

Studies which the objective is to improve database about productivity behavior of Eucalyptus species in Araripe are very important to guarantee sustainable supply of forest resources for industries in this region. In this context, the objective of this study was to evaluate influence of different planting spacings in survival rate, volume per area, per tree and mean annual increment of Eucalyptus urophylla in the Araripe Region. The experiment was conducted in Pernambuco Agrarian Institute (IPA) in Araripina - PE. It was composed of 5 treatments (spacings 2mx1m, 2mx2m, 3mx2m, 4mx2m and 3mx3m), with 4 replications distributed in a completely randomized desing. To evaluate the productivity behavior, analysis of variance and Tukey test were applied to variables related to different planting spacings. The survival rate was not influenced by spacing, while the individual volume, volume per area and mean annual increment were influenced. The spacings 3mx3m and 3mx2m contributed to better values of individual volume and the averages of this variable has similar behavior to all studies seen in literature, except for 4x2m spacing. The variables volume per area and mean annual increment were influenced by spacing only when comparing treatments 2x1m and 4x2m. So, al treatment are statistic similar, except 4mx2m. The low productivity of this hybrid (IMA average 12 m³ ha-1 year-1) could be explained by the water deficit in last years. Finally, forest still productive in relation to natural semi-arid species, which indicates the importance of investment in clonal stands in this area and in others studies about its behavior.