论文部分内容阅读
对4种不同栽培措施的日本落叶松、湿地松、马尾松和杉木等多种短周期工业材309株样木的材性进行了全面测试分析研究，结果表明．立地指数大，木材生长率和纤维宽度大．但纤维长度、纤维长宽比、木材基本密度、顺纹抗压强度和抗弯弹性模量减小；立地指数相差两级，木材的年龄宽度、纤维宽度、长度和微纤线角度的差异达到显著或极显著水平栽植密度小，木材的年轮宽度和干缩比增大但纤维长宽比及体积全干缩率减小；栽植密度增大，杉木和昭林6号杨木材的力学强度提高，但尾叶桉和I－69杨降低；不同栽植密度的木材pH值及酸碱总缓冲容量，都是心材大于边材，但木材的脲醛树脂胶凝速度，则是边材快于心材.与未间伐林分的木材比较，随着间伐强度的增大、年轮宽度增大．但纤维长宽比和微纤丝角度减小；间伐强度增大，针叶树村的力学强度降低，阔叶树树则提高．但将强度间伐材（间代40％）与未间伐材比较，结果完全相反；北京杨木材心材的pH值、酸碱缓冲容量及总容量，均随间伐强度的增大而增大，但边材却减小．施肥措施能够增大纤维直径，但将导致纤维长宽比、木材密度和力学强度的降低施肥可以使树木速生，但会降低木材密度和质量，在培育建筑结构材的林分应慎用．
A total of four kinds of cultivation measures of Larix kaempferi, Pinus massoniana and Chinese fir and other short-period industrial materials, 309 samples of wood quality of a comprehensive test analysis and research results show. Large site index, wood growth rate and fiber width. However, the differences of fiber length, fiber aspect ratio, basic density of wood, compressive strength of parallel grain and flexural elastic modulus decreased; the difference of site index was two levels, and the differences of age, fiber width, length and microfibril angle of wood reached Significant or significant level of planting density is small, wood ring width and shrinkage increase but the fiber aspect ratio and the volume shrinkage rate decreases; planting density increases, fir and Zhaolin 6 wood mechanical strength But the Eucalyptus urophylla and I-69 decreased. The wood pH value and total acid-base buffer capacity of different planting densities were higher than sapwood, but the urea-formaldehyde resin gelling speed of wood was faster than sapwood Compared with non-cut stand wood, the width of annual rings increased with the increase of thinning strength. But the fiber aspect ratio and microfibril angle decreased. The thinning intensity increased, the mechanical strength of coniferous tree decreased, and the broad-leaved tree increased. However, the results of the comparison of the thinned interwood (40% inter-generational) with that of the un-cut wood showed the opposite results. The pH value, acid-base buffer capacity and total capacity of the wood core material of Populus davidiana increased with the increase of the thinning intensity. Material is reduced. Fertilization practices can increase fiber diameter, but result in reduced fiber aspect ratio, wood density, and mechanical strength Fertilization can speed up the tree but reduce the density and quality of the wood, which should be used with caution in fostering the structure of the building material.