Chromatic aberration and decay resistance performance of bamboo and bamboo scrimber decayed by white-rot and brown-rot fungi

Moso bamboo (MB), carbonized moso bamboo (CMB), natural color bamboo scrimber (NBS), and dark color bamboo scrimber (DBS) were subjected to Poria vaporaria (PP), Gloeophyllum trabeum (GT), Coriolus versicolor (CV) and Trametes versicolor (TV) in laboratory experiments. The differences in surface chromaticity and mass loss of four samples before and after decay were compared. The results showed that the decay resistance of DBS after four wood rot fungal infections reached grade I, and DBS had the best decay resistance among the four samples. MB had the worst decay resistance among the four samples. After being infected by four kinds of wood rot fungi, the color of MB and NBS changed significantly, as the brightness decreased significantly. The red-green axis color index and yellow–blue axis color index of MB and NBS infected by PP, GT, CV, and TV showed significant increases compared to those of untreated samples. The chroma values of MB and NBS increased significantly after the decay test. SEM analysis showed that after the brown-rot test, the hyphae of GT entered the MB vessels and the parenchyma cells through the pits in the vessel, causing the cell structure to be destroyed.