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九种硬阔叶树6—15年生萌蘖的热含量、比重和灰分含量是在仲夏测定的。木材、树皮、一级枝、小枝以及树叶的热值,是用绝热燃弹式热量计测定的。测得萌芽林物质的平均热值为4791卡/克,并与已发表的老令树木的热值相比较。同一树种的不同组织之间的差异大于树种之间的相对小而显著的差异。因此,当考虑到单位土地面积所产生的能量时,土地产量的差异将会超过树种间的热值差异。灰分含量的变化从木材含0.65％到树皮含5.88％。
The heat content, specific gravity and ash content of 6-15-year-old sprouts of nine hard-leaved trees were measured in midsummer. The calorific value of wood, bark, primary branches, twigs, and leaves is determined by adiabatic bomb calorimetry. The average calorific value of germinated forest material was 4791 calories per gram and was compared with the calorific value of published trees. The differences between different tissues of the same species are greater than the relatively small but significant differences between the species. Therefore, when taking into account the energy generated per unit area of land, the difference in land yields will exceed the difference in calorific values among species. The ash content varies from 0.65% wood to 5.88% bark.