文献类型：期刊文献

英文题名：Variation in Growth, Wood Density, and Stem Taper Along the Stem in Self-Thinning Stands of Sassafras tzumu

作者：Diao, Songfeng[1] Sun, Honggang[2] Forrester, David I.[3] Soares, Alvaro A. V.[4] Protasio, Thiago P.[5] Jiang, Jingmin[2]

通信作者：Sun, HG[1]

机构：[1]Chinese Acad Forestry, Res Inst Nontimber Forestry, Key Lab Nontimber Forest Germplasm Enhancement & U, Grassland Adm, Zhengzhou, Peoples R China;[2]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou, Peoples R China;[3]Swiss Fed Inst Forest, Snow & Landscape Res, Birmensdorf, Switzerland;[4]Univ Fed Uberlandia, Dept Biol, Monte Carmelo, Brazil;[5]Rural Fed Univ Amazonia, Dept Wood Sci & Technol, Parauapebas, Brazil

年份：2022

卷号：13

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000812754600001)】；

语种：英文

外文关键词：Chinese sassafras; ring growth; stand density; stem form; tree ring wood density

摘要：Silvicultural practices greatly improve the economic value of wood products from forests. Stem dimensions, wood density, and stem form are closely linked to end-product performance. This research aimed to examine the effects of stand density and stem height on variables that reflect ring growth and wood properties of Sassafras tzumu stands during the self-thinning phase. Between the ages of 10 and 40 years, the number of stems per hectare has declined from 1,068 to 964 due to density-dependent mortality. As the relative stand density decreased, there were significant reductions in the average tree ring width (5.07-3.51 mm) and increases in latewood proportions (49.88-53.49%) and the density of the annual growth ring (165.60-708.58 kg/m(3)). Therefore, ring density, earlywood density, and latewood density increased with decreasing relative stand density after self-thinning occurred. Ring width, earlywood width, and latewood width significantly increased from the base to the apex of the stem. Stand density and stem height had additive effects on S. tzumu wood properties during the self-thinning phase. A shift in the growth allocation along the longitudinal stem in response to self-thinning resulted in decreasing radial growth, increasing wood density, and improved stem form. In summary, we found a significant influence of stand density on tree ring growth, wood quality, and stem form of S. tzumu trees during the self-thinning phase.