中文摘要：

为延长木材的耐久性,分析其自身因素和表达。选枣木、水曲柳和杨木,测量木材和木质素的碳含量、氮含量,分析碳与氮的含量之比值,测量木质素含量、木质素密度、溶于水的木质素密度、溶于苯醇溶液的萃取物含量和总萃取物密度,比较木材及木质素的红外光谱图,研究愈创木基与紫丁香基的比值。结果表明：耐久性最好的枣木的气干密度为0.93 g/cm^3;其红外光谱图在波长为1 633 cm-1,在羰基（C=O）的伸缩振动下,存在波峰;愈创木基与紫丁香基的比值为0.975;氮含量为0.274%,其木质素的氮含量为0.444%,在三种木材中为最小;枣木和其木质素的碳与氮含量之比分别为180和135,木质素密度为184.3±9.7 mg/cm^3,总萃取物密度为88.1±3.5 mg/cm^3,和水曲柳、杨木的比较,均为最大。

英文摘要：

To extend the durability of timber, some research have been done on the timber factors＇ analysis and expression. Jujube timber, Northeast China ash timber, poplar timber are chosen as the samples, to measure the carbon-nitrogen content of the timbers and the lignin, analyze the ratio of carbon-nitrogen content as well; and to measure the lignin content, lignin density, water soluble lignin density, the extract content of soluble in benzene, alcohol solution and total extract density, compare the FFIR of timber and lignin, research the ratio of guaiacyl and syringyl. Results indicated that the air dry density of Jujube, the best durability timber, is 0.93 g/cm^3, and as the FTIR of Jujube timber is 1 633 cm-1, during the stretching vibration of the carbonyl （C=O）, there is wave crest existence. The value of G/S is 0.975, the nitrogen content of Jujube timber is 0.274% and nitrogen content of Jujube lignin is 0.444%, these values are the minimum compared with those of the other two timber samples. The carbon-nitrogen content ratio of Jujube timber and of Jujube lignin is respectively 180 and 135, the density of Jujube lignin is 184.3±9.7mg/cm^3, the total extract density is 88.1±＋3.5mg/cm^3, compared with Northeast China ash timber, poplar timber, these numerical values are the maximum.