Abstract: In order to investigate the effects of different fertilizer types on the physical and mechanical properties of moso bamboo.From 2021 to 2022,a bamboo forest was used as the experimental forest which was under a long-term unmanagement state in Gengwei Village,Fangdao Town,Jian'ou City,Fujian Province.The differences in 8 related indicators such as air-dry density,oven-dry density,basic density,volume air-dry shrinkage,volume oven-dry shrinkage,bending strength,bending modulus of elasticity,and compressive strength parallel to grain of bamboo at different ages were studied under four types of fertilization conditions,including organic fertilizer,inorganic fertilizer,organic-inorganic compound fertilizer,and no fertilizer (control).The results showed that the density of fertilizers containing organic fertilizers (compound fertilizers and organic fertilizers) were higher than those of bamboo with inorganic fertilizers,and both were higher than the control groups;the bending strength and modulus of elasticity of newly grown bamboo were higher than those of the inorganic fertilizer and control groups;the application of different fertilizer types have to some extent improved the compressive strength of grade Ⅰ-Ⅲ bamboo,among which the application of compound fertilizer and organic fertilizer significantly improved the compressive strength parallel to grain.Correlation analysis and principal component analysis (PCA)indicated that bamboo density and volume shrinkage were typical characteristic indicators of the main physical and mechanical properties of the investigated bamboo.Based on comprehensive analysis,it can be concluded that under different fertilization types,bamboo treated with organic fertilizers or compound fertilizers containing organic fertilizers have higher and better physical and mechanical properties.