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通过对黄土高原50个主要树种热值和化学成分的测定,发现树种间热值的差异主要与树木体内所含的苯-乙醇抽出物和木质素的含量呈二元线性相关.50个树种的苯-乙醇抽出物和木质素含量的平均值分别为6.59和27.41％,针叶树的苯-乙醇抽出物含量(17.95％)明显高于阔叶树(5.87％),木质素含量则差异极小.苯-乙醇抽出物和木质素含量对树木热值的显著影响主要是因为它们具有极高的发热量.两种化学成分的总发热量与树木热值之间具有紧密的线性关系.
Based on the determination of caloric value and chemical composition of 50 major tree species in the Loess Plateau, it was found that the difference of caloric values among tree species was mainly linearly correlated with the content of benzene-ethanol extractives and lignin contained in the tree body. The average contents of benzene-ethanol extract and lignin were 6.59 and 27.41%, respectively, and the content of benzene-ethanol extract (17.95%) in conifer was significantly higher than that of broad-leaved tree (5.87% The significant effect of ethanol extract and lignin content on the tree caloric value is mainly due to their extremely high calorific value.The total calorific value of the two chemical components has a close linear relationship with the tree caloric value.