论文题目：Radial Variation of Wood Anatomical Properties Determines the Demarcation of Juvenile-MatureWood inSchima superba

期刊来源 ：Forests

论文作者：Yunpeng Wang, Rui Zhang* and Zhichun Zhou

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

论文链接：https://doi.org/10.3390/f12040512