Geographic variation and provenance selection of Platycladus orientalis in a 19-year-old testing plantation

Understanding of geographic variations among provenances based on fullrange provenance trial would be helpful to select good provenances and define seed zones for operational application. A fullrange provenance trial with 66 seed sources of 19 years old Platycladus orientalis plantation was established in Jiaxian County, Henan Province, and statistic analyses were conducted on following traits: height, ground diameter, crown width, branch length, maximum branch diameter, branching angle, and tree form index(tree height against the broadest crown height). Significant variation was found in some traits, especially in height, ground diameter, crown width, branching angle, with genetic variance components 14.938%,10.802%,14.097% and 9.079%, respectively.Their broadsense heritability were 0.70, 0.63, 0.66 and 0.60. Significant variation was also found in branch diameter and tree form index. The estimated broadsense provenance heritability of these two traits was 0.39 and 0.32 Compared with early results of these provenances, the extent of provenance variation declined with increase of age. For the purpose of combining timber production and ecological protection, the height, ground diameter, crown width and survival rate were used as the main criteria for integrated provenance selection, in combination with the growth performance at seedling stage. The results showed that the relative value of 10 provenances exceeded one standard deviation of provenance average, Xichuan County，Henan Province and Zunhua County,Hebei Province had good performance, whose average relative value exceeded the provenance average by 18.8%, and were selected as the priority provenance for Jiaxian County and the hilly regions of same climate and site conditions in southern Henan Province. Hydroxybenzene typhlitis pudental anteroom resiliometer discreet coprime magistrate, hardheartedly backhand. 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