文献类型：期刊文献

英文题名：Distribution of wet heartwood in stems of Populus xiaohei from a spacing trial

作者：Wang, Xiaoqing[1] Jiang, Zehui[1] Ren, Haiqing[1]

第一作者：王小青

通信作者：Jiang, Z[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing, Peoples R China

年份：2008

卷号：23

期号：1

起止页码：38-45

外文期刊名：SCANDINAVIAN JOURNAL OF FOREST RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000255063000005)】；

基金：This study is financially supported by the National Natural Science Foundation of China. The authors are grateful to Huixiang Feng, Guanglu Liu and Guang Deng from the Chinese Academy of Forestry, who provided support during field and laboratory work. Thanks are also extended to Professor Xiao-mei Jiang for her advice on the experimental design.

语种：英文

外文关键词：regression models; tree characteristics; tree spacing; wet heartwood volume

摘要：The development of wet heartwood was studied in relation to different tree spacings (2 x 5 m, 4 x 5 m, 4 x 10 m) in a 28-year-old Populus xiaohei T. S. Hwang et Liang in China. Stem discs of 5 cm thickness were taken every 2 m from the stump to the top (including the 1.3 m height), and wet heartwood area was measured for each section. Results indicated that wet heartwood was present in all sample trees, and represented a substantial part of the stem, accounting for nearly 62.0%, 56.0% and 65.2% of tree stem volume, respectively, for spacings 2 x 5 m, 4 x 5 m and 4 x 10 m. Wet heartwood tapered towards the top of the tree, closely following the stem wood profile. This vertical distribution pattern of wet heartwood was scarcely influenced by spacing. However, wider spacing resulted in larger wet heartwood area and volume, and the production of wet heartwood was positively and significantly correlated with tree diameter. Estimation of wet heartwood volume from external tree characteristics was possible using various regression models with fairly high coefficients of determination ranging from 0.87 to 0.92.