中文摘要：

以适度间伐和未间伐的人工林大青杨为研究对象,探讨了适度间伐对人工林大青杨解剖特征和物理特征的影响。结果表明：适度间伐对纤维壁厚、壁腔比和长宽比,对早材导管直径、壁腔比、长度、宽度和长宽比,对胞壁率和木射线组织比量,对生长轮密度和宽度的影响极显著;适度间伐对人工林大青杨的制浆造纸性能也有很大的影响,适度间伐和未间伐的人工林大青杨都是优良的制浆造纸原料,适度间伐的大青杨单位体积木材的纸浆产量较大。

英文摘要：

An experiment was conducted to study the influence of moderate thinning on anatomical characteristics and physical characteristics of ussuri poplar using the unthinned ussuri poplar plantation as the control. Results show that moderate thinning has significant effects on fiber wall thickness,ratio of fiber wall to lumen,fiber length to width ratio,early wood vessel diameter,vessel wall to lumen ratio,vessel length,vessel width,vessel length to width ratio,percentage of fiber cell wall,wood ray tissue proportion,growth ring width,and growth ring density. Moderate thinning also has a great effect on the properties of pulping and papermaking for ussuri poplar. Ussuri poplars in moderate thinning plantation and unthinned plantation are both suitable to be used as raw materials for pulping and papermaking,but the wood pulp output per unit volume of ussuri poplar is larger for moderate thinning plantation.