19年生侧柏种源变异及选择研究

开展树种的全分布区种源试验,研究种源间遗传变异,对选择优良种源,指导种子区区划具有重要意义。对河南郏县的侧柏全分布区种源试验林66个种源19年植株的树高、地径、冠幅、最长枝长、最粗枝径、分枝角等指标分析表明:树高、地径、冠幅和分枝角在种源间均有极显著差异,其遗传方差分量分别为14.938%、10.802%、14.097%和9.079%,其种源广义遗传力分别为0.70、0.63、0.66和0.60;最粗枝径和冠形指数也存在显著差异,广义遗传力分别为0.39和0.32。与该试验点的早期研究结果相比,种源间的变异系数随年龄增长呈减小趋势。以选择生态和用材兼用型的优良种源为目的,把树高、地径、冠幅及种源保存率作为主要选择指标,并兼顾苗期成活率,用相对指标综合选择法进行选择,结果表明:有10个种源的综合相对值超过种源平均值1个标准差以上,淅川和遵化种源的生长和适应性均优,其综合相对值均超过种源平均值18.8%,是与试验点具有相似气候区和立地条件的豫南山地侧柏生态林营建的首选种源。

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 ...