Heartwood variations in mid-aged plantations of Erythrophleum fordii

• 作者: Zhigang Zhao Wei Shen Chunsheng Wang Hongyan Jia Jie Zeng
• 来源期刊: 林业研究（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 2375-2383
• 页数: 9页
• 语种: 英文

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 differ-ences 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,inter-mediate 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 sap-wood 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 planta-tions,E.fordii stems developed heartwood once the xylem diameter reached 5-10 cm,and then heartwood diameter and area increased with increasing xylem diameter.Heart-wood ring numbers,diameter and area as well as their ratios decreased with increasing height,while sapwood ring num-bers and diameter were relatively constant within the sec-tion 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 interme-diate 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,thin-ning regimes and reasonable management of plantations of E.fordii.