竹龄和竹秆纵向部位对簕竹材性及纤维性能的影响OA北大核心CSTPCD

[Objective]This study aims to explore the effects of bamboo age and longitudinal position on wood and fiber properties of Bambusa blumeana,so as to provide theoretical and practical basis for the development and utilization of B.blumeana.[Method]The density,fiber morphology,chemical composition,mechanical properties and fiber bundle tensile properties of B.blumeana of different ages(1,2,3 and 4 years old)and different longitudinal parts(base,middle and tip)were analyzed by normal form washing,fiber segregation and microscopic observation and alkali boiling.[Result]With the increase of age,the air-dry density,total dry density,lignin mass fraction,tensile strength and longitudinal shear strength of B.blumeana increased,while the cellulose mass fraction gradually decreased.The average length difference of different longitudinal parts of B.blumeana aged 2,3 and 4 were extremely significant(P＜0.01).The fiber morphology of B.blumeana was significantly influenced by the longitudinal position.From the base to the tip of the longitudinal parts of B.blumeana,the air-dry density,total dry density,lignin mass fraction,bending strength,longitudinal shear strength,fiber bundle tensile strength and modulus all increased,while the cellulose mass fraction gradually decreased.The effects of bamboo age and longitudinal position on the mass fraction of semi fiber and benzenol extract were not obvious.[Conclusion]B.blumeana fiber has excellent properties and great potential in the development and utilization of fibrosis.There are significant differences in the properties of B.blumeana at different ages and longitudinal parts,among which B.blumeana of 3 and 4 years old can be used as the preferred material for processing and development.[Ch,5 fig.3 tab.40 ref.]