杉木生材含水率分布及其对气干的影响

摘要

以人工林杉木为研究对象, 研究生材状态下不同厚度锯材含水率的差异, 比较含髓心、钝棱与其他类型等3类锯材的含水率差异, 建立生长轮宽度与锯材含水率的关系, 分析生材状态含水率对锯材气干周期的影响.研究结果显示, 25mm和40 mm的锯材含水率差异极显著;含髓心锯材含水率最低, 其次是其他类的, 最大是含钝棱锯材;随着生长轮宽度减少, 锯材含水率增大;生长轮宽度为4 mm时, 是生材含水率分界线, 即当生长轮平均宽度小于和不小于4.0 mm时, 锯材含水率差异极显著;25 mm和40 mm厚不同含水率锯材各2组气干至含水率25％, 低含水率锯材较高含水率的气干周期分别缩短57％和66％.%In this paper, the plantation Chinese fir wood was subjected, the moisture content (MC) difference of green lumber with different thickness was studied, the moisture content difference 3 kinds of lumber (pith contained type, wane type and other types) was compared, the relationship between growth wheel width and sawn moisture content was built, and the influence of moisture content of raw material state on the dry period of sawn timber was analyzed.The results showed that:there were significant differences in the MC of 25 mm and 40 mm lumber.The max MC lumber was wane lumber, the second was other type of lumber, and the last one was pith of lumber.With the decrease of the growth ring width, the lumber MC increases.There was a significant difference in MC of growth ring more than 4 mm and no less than 4 mm of lumber.When the high and low MC of 25 mm and 40 mm lumber were reduced to 25％, the air drying time were shortened by 57％and 66％, respectively.