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在树龄、生长地域及木材含水率三项基本条件相同的前提下,通过对黄土高原主要树种热值的测定分析,提出了53个树种的热值。分析表明,针叶树的热值大于阔叶树;乔木的热值大于灌木;在比较了23个科的树种热值之后,对测定样品数在3个以上的8个科按热值大小排了次序。对7个树种前5年热值的分析表明,第3年时热值最低;前5年热值从大到小的次序是第1年,第4年,第2年,第5年,第3年。树木热值与其木材含水率呈线性负相关,而燃烧时热量损失率与含水率呈线性正相关。文中提出了热值与含水率和热值损失率与含水率两个线性回归方程式;最后还就地域对树木热值的影响作了一些探讨。
Based on the analysis of the caloric values of the main tree species in the Loess Plateau under the same conditions of tree age, growth area and wood moisture content, the calorific values of 53 tree species were proposed. The analysis showed that the coniferous tree had greater caloric value than the broadleaf tree, and the tree calorific value was greater than the shrubs. After comparing the tree caloric value of 23 families, the order of caloric value was ranked for the 8 families with more than 3 samples. The analysis of the calorific values of the first five years of the seven tree species showed that the calorific value was the lowest at the third year and the descending order of the calorific value in the first five years was the first year, the fourth year, the second year, the fifth year, the 3 years. There was a linear negative correlation between the calorific value of trees and the moisture content of the wood, while the heat loss rate and the water content of the trees showed a linear positive correlation. In this paper, two linear regression equations of calorific value and moisture content and calorific value loss rate and water content are proposed. Finally, some influences on the calorific value of trees are also discussed.