Thinning effect on plant growth of pruned eucalypt clone

Revista Árvore

Diego Correa Ramos²  Geraldo Gonçalves Dos Reis¹  Maria Das Graças Ferreira Reis¹  Helio Garcia Leite¹  Jonathan James Stocks¹  Ana Paula Leite De Lima¹  Ronan Soares De Faria¹ 

[1] ,Companhia Ferroligas Minas GeraisPirapora MG ,Brasil

关键词: Forest yield;    Diameter distribution;    Eucalypt clone;    Produção florestal;    Distribuição de diâmetro;    Clone de eucalipto;   

DOI  :  10.1590/S0100-67622014000300012

来源: SciELO

【 摘 要 】

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.

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