文献类型：期刊文献

英文题名：Crown and branch attributes of mid-aged Betula alnoides plantations in response to planting density

作者：Wang, Chun-Sheng[1] Zeng, Ji[2] Hein, Sebastian[3] Zhao, Zhi-Gang[1] Guo, Jun-Jie[1] Zeng, Jie[1]

第一作者：王春胜

通信作者：Zeng, J[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[2]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 536000, Guangxi, Peoples R China;[3]Univ Appl Forest Sci, Siviclture & Forest Growth & Yield, D-72108 Rottenburg, Germany

年份：2017

卷号：32

期号：8

起止页码：679-687

外文期刊名：SCANDINAVIAN JOURNAL OF FOREST RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000413600600006)】；

基金：This work is financially supported by the Ministry of Science and Technology of China under Grant [2012BAD21B0102].

语种：英文

外文关键词：Betula alnoides; crown attributes; spacing; branchiness; mixed-effects model

摘要：Both crown and branch characteristics greatly affect tree growth and timber quality, and their development is closely related to planting density (PD). Here crown and branch attributes of Betula alnoides were investigated in a 14-year-old experimental plantation in southern China with five planting densities ranging from 500 to 3333 stems per hectare (sph). The results showed that high PD significantly reduced crown and branch sizes. The ratios of crown diameter to stem diameter at breast height at the stand level and for dominant and co-dominant trees were almost constant regardless of PD. PD also had no significant influence on the number and angle of branches, and only planting with the highest density significantly increased branch density and mortality. Insertion angle (IA) of dead branches was greater than that of live branches and these differences were significant at the two low planting densities (833 and 500 sph). Linear mixed models revealed that branch diameter (BD) was negatively correlated with its relative height in the crown and IA. The binary-logistic regression model indicated that branch status (live or dead) was codetermined by BD and PD. These findings can help farmers cultivate high-quality wood of B. alnoides and obtain a higher economic return.