Branch phenotypic traits determine tree crown architecture, which in turn governs leaf display, light inter-ception, and biomass production. Sylleptic and proleptic branches are the obviously different branch phenotypes in the poplar crown. Many studies have focused on the influ-ence of sylleptic branch numbers (SBN) on biomass produc-tion, but the research on the influence of proleptic branch phenotypes was only a few. To explore the relationship between proleptic branch traits and biomass generation pro-duction in a high-density poplar plantation, we investigated the branch phenotypic traits of three poplar genotypes, all of which have high survival rates in forests (> 95％) and significantly different crown architecture and biomass per-formance in the high-density plantations (1667 stems -ha?1). The plantation site was established in 2007. A terrestrial laser scanner was used to measure branch characteristics such as length, angle of origin and termination, and azi-muth angle. A hierarchical cluster analysis performed on branch characteristics showed that SBN, crown depth, and proleptic branch curvature (PBC) were clustered with bio-mass production and leaf area index (LAI). Among all of the monitored traits, PBC played the second most important role in biomass production after SBN and was significantly correlated with SBN, LAI, and biomass production. The positive correlation between PBC and SBN indicated that a larger PBC was associated with more sylleptic branches within the monitored genotypes planted in the high-density plantation, providing greater leaf area and biomass produc-tion. The results of this study will improve the identification of high-production poplar varieties for cultivation in high-density plantations for biofuel production.

Changjun Ding;Ningning Wang;Qinjun Huang;Weixi Zhang;Juan Huang;Suli Yan;Boyi Chen;Dejun Liang;Yufeng Dong;Yingbai Shen;Xiaohua Su

State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry,Chinese Academy of Forestry, Beijing,People's Republic of China;Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing, People's Republic of China;College of Biological Sciences and Technology,Beijing Forestry University, Beijing 100083,People's Republic of China;National Engineering Laboratory for Tree Breeding,Beijing Forestry University, Beijing 100083,People's Republic of China;Liaoning Provincial Poplar Institute, Gaizhou 115200,Liaoning, People's Republic of China;Shandong Provincial Key Laboratory of Forest Tree Genetic Improvement, Shandong Academy of Forestry, Jinan 250014,Shandong, People's Republic of China

林业研究（英文版）

[1]Changjun Ding;Ningning Wang;Qinjun Huang;Weixi Zhang;Juan Huang;Suli Yan;Boyi Chen;Dejun Liang;Yufeng Dong;Yingbai Shen;Xiaohua Su-.The importance of proleptic branch traits in biomass production of poplar in high?density plantations)[J].林业研究（英文版）,2022(02):463-473

proleptic,Sylleptic,sylleptic,azi,muth

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