Heartwood variations in mid-aged plantations of Erythrophleum fordii  

作　　者：Zhigang Zhao Wei Shen Chunsheng Wang Hongyan Jia Jie Zeng 

机构地区：[1]Research Institute of Tropical Forestry,Chinese Academy of Forestry,Longdong,Guangzhou 510520,People’s Republic of China [2]Zhaoqing University,Zhaoqing City 526061,People’s Republic of China [3]Experimental Centre of Tropical Forestry,Chinese Academy of Forestry,Pingxiang City 532600,People’s Republic of China

出　　处：《Journal of Forestry Research》2021年第6期2375-2383,共9页林业研究（英文版）

基　　金：This study is supported by the Fundamental Research Funds for the Central Non-profit Research Institution of CAF(Grant No.CAFYBB2017MB019).

摘　　要：Erythrophleum fordii Oliv.(Caesalpiniaceae)is a rosewood species naturally distributed in southeast Asia and south China,and the heartwood is commonly used for high-quality crafts and furniture.While there are differences in heartwood development among single trees with distinct social status,the relationship between heartwood development and growth performance remains unclear.This information is essential to improve plantation management for high-yield heartwood production.Forty dominant,intermediate and suppressed trees were sampled from E.fordii plantations aged in 32-35 years in Pingxiang City,Guangxi,China.Stem analysis was carried out to determine horizontal and vertical variations of heartwood and sapwood.Number of annual rings,diameter and area of heartwood and sapwood as well as ratios of heartwood diameter and area at breast height were all significantly influenced by the social status of trees in stands(P<0.05).In these mid-aged plantations,E.fordii stems developed heartwood once the xylem diameter reached 5-10 cm,and then heartwood diameter and area increased with increasing xylem diameter.Heartwood ring numbers,diameter and area as well as their ratios decreased with increasing height,while sapwood ring numbers and diameter were relatively constant within the section where heartwood occurred.Heartwood and sapwood diameters were equal at heights of approximately 6-m for dominant,5-m for intermediate and 3-m for suppressed trees.Dominant trees differed considerably from intermediate and suppressed trees in heartwood volume,while heartwood volume ratios were all below 30%,and near 90%in the stem section below 8-m height regardless of social status.Relationship analysis showed that DBH was the most important factor influencing heartwood in even-aged stands.The findings provide evidence for crop tree selection,thinning regimes and reasonable management of plantations of E.fordii.

关 键 词：Erythrophleum fordii Heartwood formation Spatial variation Tree differentiation 

分 类 号：S781[农业科学—木材科学与技术]