Rebrota de povoamentos de eucalipto na condução sob sistema de talhadia simples

Abstract

Planted forest plantations are important sources of renewable raw material used in contemporary times, their extensive use is justified in view of the great adaptability of some exotic species to different territories and edaphic conditions. In eucalyptus culture the driving system chosen is one of the most relevant decision making according to the project objective. The simple coppicing system has been used by many national companies due to the reduction in costs and operations that can be obtained in this system. The objective of this study was to evaluate the effect of operational (cutting height), genetic (clone) and silvicultural (planting spacing) factors for sprouting in the regeneration of eucalyptus stands in a single coppice system. A randomized block design with six replications, each containing eighteen treatments, in a 6 x 3 factorial scheme, six clones (COP 1404, COP 1407, AEC 1528, AEC 0042, AEC 0224, AEC 0144) and three spacings (3x1m, 3x2m, 3x4m) being occupied respectively 3, 6 and 12 m2 for each plant. For each strain the height of the cut, the diameter and the total number of shoots were collected. For statistical analysis, generalized linear models were used for binomial distribution. As results, it was found that mortality is influenced by the clone used, while the spacing has little influence on this variable. Considering the total number of shoots, there is statistical difference for clone and spacing, as well as for the interaction of these two factors. There is a direct relationship between the largest diameters and the greatest spacing and there is also a significant difference in diameter values for the different clones. For the variable height of cut was found statistical difference for the number of shoots per strain.