4种大径丛生竹材的密度和干缩性研究

对油簕竹(Bambusa lapidea)、车筒竹(B.sinospinosa)、越南巨竹(Dendrocalamus yunnanicus)和麻竹(D.latiflorus)4种大径丛生竹竹材不同部位的密度和干缩性进行了测定和分析。结果表明,4种竹材的基本密度分别为0.742、0.678、0.761和0.601g·cm-3。气干体积干缩性分别为4.61%、3.82%、3.28%和3.66%。各竹种竹材的密度和全干缩性有显著差异,而竹材的气干干缩率没有显著差异。竹材的气干、全干和基本密度均与竹秆高度呈正相关,干缩性则相反。与常见的板材原料毛竹相比,4种竹材的密度和干缩性均可达到板材原料的要求。

Study on density and shrinkage of the 4 species of big sympodial bamboo

The densities and shrinkages of the 4 species of big sympodial bamboo (Bambusa lapidea, B.sinospinosa, Dendrocalamus yunnanicus, D.latiflorus) with different positions of culm were tested and analyzed. The results showed that the basic density of the 4 species of big sympodial bamboo were 0.742, 0.678, 0.761 and 0.601 g·cm-3. Their air-drying volume shrinkage ratios were 4.61%, 3.82%, 3.28% and 3.66%. There were significant differences of the density and the oven-dried shrinkage rate, but no significant differences of the air-dried shrinkage rate among the bamboo species. The air-dried density, oven-dried density and basic density increased gradually from the culm foot to tip, but shrinkage reversely. Compared with Phyllostachys edulis, the densities and shrinkages of the 4 species all reached the requirement of bamboo-based panel.