Bark content variations and the production of Populus deltoides as a source of bioenergy under temperate climate conditions

Bark biomass as an energy source has a high economic value. Bark content variations and production helps recognize the potential of this bioenergy source spatially before harvesting. The percentage of fresh and dry bark in Populus deltoides grown under a monoculture system was examined in the temperate region of northern Iran. Diameter at breast height (DBH) and total height data were analyzed based on an initial inventory. Ten sample trees were felled, separated into 2 m-segments, and weighted in the field. A 5-cm-thick disc from each segment was extracted for determining fresh and dry bark percentages. These were statistically significantly different in disc diameter classes and decreased with increasing disc diameters. Bark percentage of the disc classes ranged from 21.8 to 24.4% in small-sized diameters to 8.1‒9.3% in large-sized diameters. The differences between fresh and dry bark percentages depended on water content variations. Allometric power equations were fitted to data o...树皮生物质作为能源原料具备较高经济价值。在采伐前通过分析树皮含量变化与产量的空间分布特征，可精准评估该生物质能源的开发潜力。本研究于伊朗北部温带地区，针对单作栽培体系下的美洲黑杨（Populus deltoides）的鲜树皮与干树皮占比展开了调研。研究基于初始森林清查数据，对胸径（Diameter at Breast Height, DBH）与树木总高数据进行了分析。选取10株样木进行伐倒，将其切割为2米长的分段并在野外称重。从每一分段中截取厚度为5厘米的圆盘试样，用于测定鲜树皮与干树皮的占比。统计结果显示，不同圆盘直径等级的树皮占比存在显著差异，且随圆盘直径增大而降低。不同直径等级圆盘的树皮占比范围为：小径级圆盘为21.8%~24.4%，大径级圆盘则为8.1%~9.3%。鲜树皮与干树皮占比的差异取决于含水率变化。研究基于相关数据拟合得到了异速生长幂函数方程……