Microstructure And Chemical Composition Changes Of Betula Luminifera, Moso Bamboo And Phyllostachys Praecox In Decay

The heartwood, sapwood, culm and knot of clean and degraded Betula luminifera, Moso Bambooand Phyllostachys praecox by Corilus versicolor and Poria placenta were tested by Microstructure,FTIR analysis, XRD analysis and chemical components analysis. The purpose of testing is exploring thechanges of components and degradation mechanism of the wood and bamboo rotted by white-rot fungiand brown-rot fungi. Test results are as follows:①Coriolus versicolor has the effect of cleaning up thecovering of wood surface’s pores, Poria placenta has the same effect, but less than Corilus versicolor.Corilus versicolor mainly to destroy the fiber cells and parenchyma reflects the resistance. Poriaplacenta preferentially degraded parenchyma of wood, small parenchyma cells, sieve tubes, companioncells in bamboo vascular bundles and parenchyma cells close to the vascular bundles, fiber and conduitreflects the resistance, but at a later stage, the fiber wall holes, the catheter was degraded;②The degreeof crystallinity measured directly by XRD instrument comes with the software is not ideal, using theempirical formula of Turley, the method of Jade5.0linear fitting and crystallinity index NO’KI of FTIRto obtain the relative degree of crystallinity is better;③The degree of wood and bamboo crystallinitydecreases with the increase of decadent time. After the decadent, the peak position and FWHM ischanged, the symmetry of peak deteriorated also;④Poria placenta can cause a substantial loss ofquality of wood and bamboo; Coriolus versicolor can only be a lot of degradation of the wood and lessdegradation of bamboo;⑤Poria placenta is brown rot, but generated a lot of degradation of lignin inwood and bamboo;⑥Coriolus versicolor generated a lot of degradation of lignin to Moso Bamboo,Phyllostachys praecox’s is weak, and the wood’s is almost no degradation;⑦No better white rot orbrown rot, the general trend of changes in the degree of crystallinity, the main functional groups andchemical composition of heartwood, sapwood, culm and knot is basically the same after decadent.⑧Dyed bamboo before and after decadent by1000mg/L of methylene blue solution.after stain, bambootreated by Coriolus versicolor turned to red, the depth of the dye into the bamboo is not increased, thecolored saturation is low, the color is light, tinting strength is week; The depth of the dye into thebamboo treated by Poria placenta is increased with the decadent time, and both vertical and radialincreased, the colored saturation is high, the color is deep.