Effects of pruning and stand density on the productionof new epicormic shoots in young stands of pedunculate oak (Quercus robur L.)

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• 作者：Giulia Attocchi (1)
  
• 关键词：Epicormic shoots ; Pedunculate oak ; Pruning ; Stand density ; Thinning practice
• 刊名：Annals of Forest Science
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：70
• 期：7
• 页码：663-673
• 全文大小：310KB
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• 作者单位：Giulia Attocchi (1)
  
  1. Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, R?rsj?v?gen 1, P.O. Box 49, 230 53, Alnarp, Sweden
  

文摘

Context Avoidance or control of epicormic shoots is among the major silvicultural challenges for the production of high-quality oak timber. In northern Europe, contemporary oak silviculture aims to produce valuable timber on a relatively short rotation, applying early, heavy thinning combined with artificial pruning. Aims The aim of this study was to analyse the effects of pruning and stand density on the production of new epicormic shoots on young trees of pedunculate oak (Quercus robur L.). Methods The study was based on two field experiments in even-aged stands of pedunculate oak subjected to different thinning practices and early selection of potential future crop trees. From ages 13 to 15?years, stem density was reduced to 300 trees ha?, 1,000?ha? or stands remained unthinned. Pruning was conducted on selected trees at ages 22-4?years. At that age, the stem density in unthinned control plots ranged from 2,500 to 3,100?ha?. All treatments were replicated twice within each experiment. Results Pruning led to an overall increase in the total production of new epicormic shoots. More epicormic shoots were produced in the lower part of the stem (0-?m in height) than in the upper part (3-?m). The number of new epicormic shoots increased with increasing stand density. Conclusion Early, heavy thinning combined with high pruning at regular intervals may help shorten the rotation length for pedunculate oak without further reduction in wood quality than that which is caused by wider annual growth rings.