耐寒丛生竹椽竹竹材的理化性质分析

测定了椽竹竹材的理化性质,并与毛竹、青皮竹和绿竹竹材进行了比较分析.结果表明:椽竹各竹龄竹材的基本密度、气干密度和全干密度平均值分别为0.523～0.632 g·cm-3、0.656～0.801 g·cm-3和0.658～0.777 g·cm-3,随着竹龄增长各部位竹材密度表现出增大的趋势,3年生以上椽竹竹材基本密度小于参比竹种毛竹和青皮竹,大于绿竹.3年生以上椽竹竹材的平均气干体积于缩率和全干体积干缩率分别为9.6％和13.6％,大于毛竹；各竹龄椽竹竹材径向干缩率大于弦向干缩率和纵向干缩率.3年生以上椽竹竹材的灰分平均含量小于绿竹和青皮竹,酸不溶木素平均含量与青皮竹接近而小于绿竹,综纤维素含量大于80％,多戊糖、热水抽出物、1％NaOH抽出物平均含量均高于青皮竹和绿竹,而苯-醇抽出物平均含量小于青皮竹和绿竹.综合分析,椽竹作为纸浆材具有较高的利用价值.

Study on Physical and Chemical Characteristics of Culms of Cold Resistance Sympodial Bamboo,Bambusa textilis var. fasca

The physical and chemical characteristics of culms of Bambusa textilis var. fasca were measured, and a comparative analysis with Phyllostachys edulis, B. textilis and Dendrocalamopsis oldhami were made. The results showed that the average basic density, air-dried density and oven-dried density of B. textilis var. fasca among different ages changed in the ranges of 0.523~0.632 g·cm^-3, 0.656~0.801 g·cm^-3 and 0.658~0.777 g·cm^-3 respectively. The density of B. textilis var. fasca increased with age. The basic density of B. textilis var. fasca with the age over 3 years was lower than that of reference P. edulis and B. textilis, but higher than that of D. oldhami. The average air-dried volume and oven-dried volume shrinkage ratio of B. textilis var. fasca with the age over 3 years were 9.6% and 13.6% respectively, which were higher than that of P. edulis. The radial shrinkage of B. textilis var. fasca was greater than tangential shrinkage and portrait shrinkage. The average ash content of B. textilis var. fasca with the age over 3 years was less than that of D. oldhami and B. textilis, but the average lignin content of B. textilis var. fasca with the age over 3 years was similar to that of B. textilis and less than that of D. oldhami. The holocellulose content of B. textilis var. fasca was more than 80%. The average content of pentosan, hot water extracts and 1%NaOH extracts of B. textilis var. fasca with the age over 3 years were also greater than that of D. oldhami and B. textilis. But the average content of benzene-alcohol extracts of B. textilis var. fasca with the age over 3 years was less than that of D. oldhami and B. textilis. Therefore it is suitable for B. textilis var. fasca to be used for pulpwood.