<正>以材质生成期为 1～ 8年生毛竹为研究对象 ,采用同一部位取样的方法 ,研究了材质生成期中 9种主要化学成分的变化 ,以及竹秆不同高度部位化学成分的变化。结果表明 ,木素含量随竹龄增长呈指数增加 ,灰分含量与竹龄变化呈二次曲线关系 ,综纤维素和各种抽出物含量与竹龄呈阶段性变化。化学成分随竹龄的变化可以分为增长期 ( 1～ 4年生 )、成熟期 ( 5～ 7年生 )、下降期 ( 8年生以上 )。竹秆不同高度部位的主要化学成分变化很小 ,各种抽出物含量 ,从根部到梢部略有减少

The author studied 9 chemical compositions of moso bamboo aged from 1 to 8 years and the differences of chemical composition in the different parts of culm were studied.The results shown:ash content varies by quadratic equation,and lignin increases with bamboo ages by exponential equation,but the other chemical compositions show a periodical change with aging.According to the variation regularity of chemical compositions the bamboo mature growing can be classified as three periods:increasing period(below 4 years old),steady period(5～7 years old),declining period(above 8 years old).The difference of main chemical compositions in the different parts of the culm is very little though the kinds of abstracts of bamboo decline a little from the bottom to the top.