文献类型：期刊文献

英文题名：Effect of planting density on knot attributes and branch occlusion of Betula alnoides under natural pruning in Southern China

作者：Wang, Chunsheng[1] Zhao, Zhigang[1] Hein, Sebastian[2] Zeng, Ji[3] Schuler, Johanna[4] Guo, Junjie[1] Guo, Wenfu[3] Zeng, Jie[1]

第一作者：王春胜

通信作者：Zeng, Ji

机构：[1] Research Institute of Tropical Forestry, Chinese Academy of Forestry, Longdong, Guangzhou, 510520, China; [2] University of Applied Forest Sciences, Schadenweilerhof, Rottenburg, 72108, Germany; [3] Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang, Guangxi, 536000, China; [4] Albert-Ludwigs-University, Freiburg, 79106, Germany

年份：2015

卷号：6

期号：4

起止页码：1343-1361

外文期刊名：Forests

收录：EI(收录号：20152300909866);Scopus(收录号：2-s2.0-84930636848)

语种：英文

外文关键词：Forestry - Wood

摘要：Knot-related defects are the major cause of timber quality degradation, and diminishing this kind of defects is an important issue in forest management. For the purpose of clear-wood production, knot attributes and branch occlusion of Betula alnoides under natural pruning were investigated in a 14-year-old experimental plantation with five planting densities ranging from 500 to 3333 stems per hectare in southern China, and a total of 1325 occluded branches from 30 trees were sampled and dissected. The mean occluded branch diameter (OBD), radius of knots and branch insertion angle (IA) decreased significantly with increasing planting density. Planting with high stocking density significantly reduced the frequency of thick occluded branches (diameter ≥ 20 mm) while increasing the frequency of small ones (diameter ? 2015 by the authors; licensee MDPI, Basel, Switzerland.