Radial Variation of Wood Anatomical Properties Determines the Demarcation of Juvenile-Mature Wood in Schima superba

Schima superba is a precious broadleaf tree species that produces excellent timber. Analyzing the radial variation of wood anatomical properties within stems and determining boundary between juvenile mature can provide theoretical basis for breeding cultivation S. superba. Herein, 30 54-year-old trees were used to analyze qualitatively. The correlation among was analyzed. On this basis, four types model predict quantitatively, optimal segmentation determine wood. results showed early stage (before 20th year) larger than later (after year); moreover, vessel features (9.56%) greater fiber (7.42%), lumen diameter (11.94%) length (8.00%) had most variation. There three patterns in properties. In stage, there significant positive ring width air-dry density (0.78) basic (0.89), negative characters (?0.79~?0.93) (?0.64~?0.90). growth models Logistic Richards more suitable (R2 = 84.2%~95.2%) nonlinear least square 67.7%~90.9%). transition from 11th 16th year based on aggregative indicators pith bark at breast height. Finally, when taken together, regular Breeding programs need consider both but they be neglected stage. formation occurred after year.