文献类型：期刊文献

英文题名：Influence of Cambial Age and Axial Height on the Spatial Patterns of Xylem Traits in Catalpa bungei, a Ring-Porous Tree Species Native to China

作者：Li, Shan[1,2] Li, Xin[3] Link, Roman[4] Li, Ren[1,2] Deng, Liping[1] Schuldt, Bernhard[4] Jiang, Xiaomei[1,2] Zhao, Rongjun[1] Zheng, Jingming[3] Li, Shuang[5] Yin, Yafang[1,2]

通信作者：Yin, YF[1];Yin, YF[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Dept Wood Anat & Utilizat, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Wood Collect WOODPEDIA, Beijing 100091, Peoples R China;[3]Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China;[4]Univ Wurzburg, Julius von Sachs Inst Biol Sci, Ecophysiol & Vegetat Ecol, Julius von Sachs Pl 3, D-97082 Wurzburg, Germany;[5]Beijing Ctr Phys & Chem Anal, Beijing 100089, Peoples R China

年份：2019

卷号：10

期号：8

外文期刊名：FORESTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000482949200050)】；

基金：This work was supported by the project of the Chinese Academy of Forestry (CAFYBB2017ZX003-01). Beijing Natural Science Foundation (6184048) is also acknowledged for the financial support.

语种：英文

外文关键词：wood anatomy; vertical and radial variation; earlywood; latewood; growth ring width; tyloses; pit membrane diameter; vessel lumen diameter; fibre length

摘要：Studying how cambial age and axial height affects wood anatomical traits may improve our understanding of xylem hydraulics, heartwood formation and axial growth. Radial strips were collected from six different heights (0-11.3 m) along the main trunk of three Manchurian catalpa (Catalpa bungei) trees, yielding 88 samples. In total, thirteen wood anatomical vessel and fiber traits were observed usinglight microscopy (LM) and scanning electron microscopy (SEM), and linear models were used to analyse the combined effect of axial height, cambial age and their interaction. Vessel diameter differed by about one order of magnitude between early- and latewood, and increased significantly with both cambial age and axial height in latewood, while it was positively affected by cambial age and independent of height in earlywood. Vertical position further had a positive effect on earlywood vessel density, and negative effects on fibre wall thickness, wall thickness to diameter ratio and length. Cambial age had positive effects on the pit membrane diameter and vessel element length, while the annual diameter growth decreased with both cambial age and axial position. In contrast, early- and latewood fiber diameter were unaffected by both cambial age and axial height. We further observed an increasing amount of tyloses from sapwood to heartwood, accompanied by an increase of warty layers and amorphous deposits on cell walls, bordered pit membranes and pit apertures. This study highlights the significant effects of cambial age and vertical position on xylem anatomical traits, and confirms earlier work that cautions to take into account xylem spatial position when interpreting wood anatomical structures, and thus, xylem hydraulic functioning.