蒸汽热处理对毛竹材碳含量及化学组分的影响OA

This study aims to investigate the response mechanisms of carbon content and chemical composition of moso bamboo(Phyllostachys edulis)timber to steam heat treatment.The carbon content and chemical constituents at different horizontal positions of 5-year-old moso bamboo(green epidermis,outer parenchyma,middle parenchyma,inner parenchyma and yellow layer)were measured and compared before and after treatment.It was found that after steam heat treatment at 120℃,significant differences were observed in the carbon content and chemical composition at different horizontal positions of the bamboo.Specifically,the carbon content slightly increased in the green epidermis and yellow layer of bamboo,while it decreased in the bamboo parenchyma,with the most pronounced change occurring in the middle parenchyma.The cellulose content significantly increased in the inner parenchyma but decreased to varying degrees in other parts.The holocellulose content markedly decreased in the middle parenchyma,with only minor changes in other parts.The lignin content decreased substantially in other sections except the green epidermis,where almost no reduction was detected.Microstructural and chemical characterization via techniques such as X-ray diffraction,Fourier transform infrared spectroscopy,and scanning electron microscopy revealed that these variations were associated with differences in vascular bundle density,porosity,and the distribution of chemical components such as hemicellulose and lignin across different horizontal positions.