Study On Culm-form Structure And Physical And Mechanical Properties Of Four Kinds Of Big Sympodial Bamboo

In this research,four kinds of usual big sympodial bamboo (Bambusa lapidea McClure, Bambusa sinospinosa McClure,Dendrocalamus yunnanicus Hsueg et D.Z.Li and Sinocalamus latiflorus Munro ) in the south of China were studied and made Bambusa lapidea McClure, Dendrocalamus yunnanicus Hsueg et D.Z.Li and Sinocalamus latiflorus Munro into laminated bamboo strips lumber.According the national standards, culm form, physical and mechanical properties, physical and mechanical properties of laminated bamboo strips lumber and fibre forms were tested and analyzed.The result of culm-form structure,physical and mechanical properties studying showed that four kinds of bamboo had high culm, long internode and lower culm taper.There was extremely significant correlation between the culm height and DBH of Dendrocalamus yunnanicus Hsueg et D.Z.Li and Sinocalamus latiflorus Munro.the basic density of four kinds of big sympodial bamboo were 0.742g/cm3,0.678g/cm3,0.761g/cm3and 0.601g/cm3.The air-drying volume shrinkage ratio of big sympodial bamboo were 4.61%,3.82%,3.28%and 3.66%.The air-dry density,all-dry density and basic density increased gradually from the culm foot to tip.The average compressive strength parallel to grain, shearing strength parallel to grain, tensile strength parallel to grain,bending strength (MOR) and modulus of elasticity in static bending (MOE) of four kinds of big sympodial bamboo were 62.9MPa,12.8MPa,271.1MPa,169.5MPa and14.8GPa respectively and had the same tend with density from the culm foot to tip.The study of physical and mechanical properties of laminated bamboo strips lumber showed that The results showed that the physical and mechanical properties of the three kinds of laminated bamboo strips lumber reached the requirement of the standard of laminated bamboo strips lumber. The order of the density, MOR and MOE, pushing strength of the three kinds of laminated bamboo strips lumber is Bambusa lapidea McClure>Dendrocalamus yunnanicus Hsueg et D.Z.Li>Sinocalamus latiflorus Munro. Therefore, they could be used as bamboo board material.The result of fiber forms test showed that the fiber length(L) varied from 2.12mm to 2.49mm, the fiber tissue measurements was from 30.69% to 44.45% .Their L/W and fiber tissue measurement were high.So four kinds of bamboo belonged to superior paper-making material.The research of this paper laid theoretical foundation and provided technical support for technologies of cultivation, management and integrated utilization of big sympodial bamboo,which had important economic and ecological significance.