速生林杉木活立木改性研究

Study on stumpage modification of fast-growing Chinese fir

对速生林杉木进行了活立木改性研究,分析了改性剂在木材内部不同高度位置的分布情况,并利用SEM对改性剂在木材内部的形态和分布进行了进一步深入研究,同时对改性材主要力学性能(顺纹抗压强度、静曲强度及弹性模量)的变化情况进行了研究与分析。结果显示:经改性后,改性剂填充了木材内部的导管及孔隙,改性木材的主要力学性能与素材相比均有不同程度的提高,且改性剂主剂浓度的变化及助剂的加入对改性剂在木材不同树高位置的分布均有较大影响,助剂聚乙二醇的加入使主剂在立木内部的分散更加均匀。

The stumpage modification on China fir in fast-growing forest were studied, the distribution and diffusion of modifier in activity living trees at different height positions were investigated, and by using SEM, the morphology and distribution of modifiers inside the living trees were ulteriorly studied. In addition, the mechanical properties of modified wood （compressive strength parallel to grain, MOR and MOE） were also investigated. The results show that the vessels and pores were filled with modifier and the mechanical performance of modified wood were improved in comparison of wood untreated; The concentration of modifier and the added assistant significantly affected the distribution of modifier in the living trees at different height positions. And the addition of PEG made the contribution of modifier more uniform.