INFLUENCE OF PLANT SPACING ON THE BARK PROPERTIES OF A Eucalyptus CLONE

ABSTRACT For several wood uses, such as pulp, paper and charcoal, the presence of the bark is undesirable, compromising production. Thus, this study aimed to evaluate the influence of different plant spacings on the properties of the bark of a clone of Eucalyptus grandis x E. camaldulensis at seven years of age at five different plant spacings. The wood discs were removed from the trees at 0, 25, 50, 75 and 100% of the commercial height; then we performed thickness, basic density, gross calorific value and mineral content analysis of bark. There were no significant differences among treatments for the bark gross calorific value and thickness. For the bark basic density, the highest values were found in trees planted in wider plant spacings and considering the mineral content, there was a significant difference only for P, Mn and Zn.

摘要：在纸浆、造纸与木炭生产等多种木材应用场景中，树皮的存在会产生不利影响，损害生产效益。因此，本研究以5种不同种植密度下生长的7年生巨桉（Eucalyptus grandis）与赤桉（Eucalyptus camaldulensis）杂交无性系为试验材料，旨在评估不同种植密度对其树皮性状的影响。研究人员从试验木的商品材高度0%、25%、50%、75%及100%处采集木材圆盘试样，随后对树皮的厚度、基本密度、总热值及矿物元素含量开展分析。结果表明，各处理组的树皮总热值与厚度均无显著差异；就树皮基本密度而言，采用较宽种植密度的试验木其数值最高；而在矿物元素含量方面，仅磷（P）、锰（Mn）及锌（Zn）的含量存在显著差异。