Thinning effect on plant growth of pruned eucalypt clone

Abstract

-A pruned stand of eucalypt clone underwent five thinning treatments with the removal of different proportion of the planted trees, at different ages: a) 0% -unthinned, b) 35% at 55 months, c) 35% at 81 months, d) 70% at 81 months, removing sprouts in the thinned plant stumps and, e) 70% at 81 months, without coppice sprouts removal. By the age of 141 months, the Weibull distribution showed higher number of trees in the smallest diameter classes for the unthinned treatment. The 70% thinning, with thinned coppice sprouts removal, presented higher number of individuals in the largest diameter classes. Height and yield were the smallest with the removal of 70% of the trees at 81 months, maintaining coppice sprouts. The afterthinning periodic annual increment was greater by thinning 35% of the trees at 55 months resulting in greater number of trees in the largest diameter classes as compared to the other treatments. Yield was higher for the unthinned treatment. The results of this study indicated that thinning 70% of the trees at the age of 81 months, with coppice sprout removal, could be recommended to obtain trees of larger diameter for multiproduct.Keywords: Forest yield; Diameter distribution; Eucalypt clone. EFEITO DO DESBASTE SOBRE O CRESCIMENTO DE PLANTAS DE CLONE DE EUCALIPTO DESRAMADO RESUMO -Um povoamento desramado de eucalipto foi submetido a cinco tratamentos de desbaste, com remoção de diferentes proporções das árvores plantadas e idades: a) 0% não desbastado, b) 35% aos 55 meses, c) 35% aos 81 meses, d) 70% aos 81 meses, removendo a brotação nas cepas desbastadas e e)

Efeito Da Remoção De Ramos Laterais (“Toalete”) Sobre O Crescimento Inicial De Mudas Clonais De Eucalipto Em Campo

“…Esta técnica silvicultural envolve a remoção de galhos preferencialmente vivos com vistas à produção de madeira serrada limpa livre de nós, aumentando assim seu valor agregado . Tais estudos vêm demonstrando que a influência da retirada de galhos sobre o crescimento das plantas depende da proporção da área foliar removida e da capacidade de recomposição da copa das plantas, fatores fortemente influenciados pelo genótipo (aspectos morfológicos e fisiológicos), capacidade produtiva do sítio e pelo espaçamento e arranjo espacial do plantio (MONTE et al, 2009;FONTAN et al, 2011;TAIZ & ZEIGER, 2013;RAMOS et al, 2014).…”