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Abstract To better understand the genetic control of growth traits (tree height, dbh and stem volume) and wood properties (basic wood density and fiber length) in triploid hybrid clones of Populus tomentosa, genetic relationships among selected wood properties with growth traits were examined in 5-year-old clonal field trials located in Yanzhou, Gaotang and Xiangfen, northern China.In total, 180 trees from 10 clones were sampled from the three sites.The site had a moderate effect on basic wood density (BWD), stem wood dry weight (DWT) and tree growth, and a highly significant effect on fiber length (FL) (P< 0.001).Clonal effects were also significant (P< 0.05) for all studied traits (except for DBH and SV).Clone × site interaction was significant for all the studied traits except for FL.The estimated repeatability of clonal means for FL (0.91) was higher than for BWD (0.71), DWT (0.62), tree height (H) (0.62) diameter at breast height (DBH) (0.61), and stem volume (SV) (0.55).Inter-site genetic correlation estimates indicated that wood properties were more stable than growth traits.Phenotypic correlation estimates between SV and BWD ranged from-0.29 to-0.10.