毕业设计（论文）-木材物理性能株内变异研究.doc

中文题目:木材物理性能株内变异研究
外文题目:Study on Variation within Individual Tree of Physics Properties of Wood
毕业设计(论文)共44页(其中外文文献及译文17页) 图纸共0张
完成日期:2012年6月答辩日期:2012年6月
摘要
本文以辽西北地区生长良好的彰武松与樟子松为研究对象,研究了彰武松与樟子松的管胞形态、微纤丝角度、扫描电镜下的显微形态。结果表明,彰武松管胞长度、宽度大于樟子松,微纤丝角小于樟子松,长宽比略大于樟子松。彰武松的管胞长度径向变异规律是由髓心向外先增加,然后减小,呈抛物线性状,在W13达到最大值4000μm,%。樟子松管胞长度径向变异规律是由髓心向外依次增加,%;管胞宽度变异规律,彰武松与樟子松木材纤维宽度径向变异趋势与树龄也存在着一定的相关性,总体趋势是由髓心向外首先呈现增加趋势,到一定年龄后降低,而后又呈现增加趋势。
关键词:管胞;微纤丝角;木材纤维;变异
ABSTRACT
In this paper, as the research object of the growing well W pine and Z pine in northwestern Liaoning, this paper study the tracheid morphology, microfibril angle and scanning electron microscope morphology of the W pine and Z results show that tracheid length and width of W pine is bigger than Z pine and the microfibrillarangle is antipodal. but aspect ratio of Z pine is slightly larger than W pine. For W pine the rules of radial variation of tracheid length is increased firstly from the pith outward, and then decreased. this Radial Variation presents a parabola traits. The tracheid length reached the maximum of 4,000 microns in the W13, and the coefficient of variation is %.For Z Pine the rules of radiation variation of tracheid length is increased orderly from pith outward. The coefficient of variation is %. A correlation is existed between W and Z pine’s Radial variation of wood fiber width trend and the tree-age. The general trend is showing an increasing trend from the pith outward firstly and decreasing after a certain age, but then showing an increasing trend also.
Keywords: Tracheid; Microfibril angle; Wood fiber; Variation
前言
我国森林资源比较匮乏,属于少林国家,且分布不均,质量不高,人均林地面积、%、12%%,木材资源严重不足。随着森林结构的变化,原始森林所提供的大径级木材愈来愈少,人工林,间伐林和速生丰产林提供的幼材林,小径木越来越多,所能利用木材越来越少。
木材作为生活中不可或缺的材料导致对木材的需求量日益增大,加之我国森林资源匮乏,对木材的利用又不甚合理,这些因素使得我国木材市场供需矛盾加剧。为了解决这些矛盾,维持木材工业的可持续发展,满足人们对木材的需求量,就必须科学的利用现有的各类木材,提高现存木材的利用率,改良木材的某些特性,提高木材的使用价值。基于此,就必须对木材的材性和变异规律进行深入细致的研究和探索。
木材的性质决定着木材的经济价值,同时