Abstract Forest companies prefer a coppice system as a silvicultural strategy owing to its economic and sustainability advantages compared to developing new plantations for second rotations. However, studies aiming to determine the selection of superior genetic material for this management strategy are scarce. In this study, we evaluated five clonal tests of Eucalyptus spp. located in Itatinga and Angatuba, São Paulo State, Brazil, to determine the genetic correlations and control of productivity for regrowth management in two rotations. The volume (m3) and survival of the Eucalyptus spp. clonal tests were determined for the two rotations at 5.5 years of age. The experiments were carried out in a randomized block design with six replicates, five plants per plot, and unbalanced treatments. The heritability in the normal scale ( h^n2 \hat h_n^2 ) for the survival ranged from 0.056 to 0.11, the heritability in the broad sense ( h^g2 \hat h_g^2 ) ranged from 0.205 to 0.334, and the genotypic correlation was positive and high (0.71-0.86), and statistically significant to the genetic means for the two rotations. The ranking of the best clones in the second rotation was similar (76 %) to their ranking in the first selection. Thus, for the evaluated material, there was no need for the second measurement to obtain accurate selection when managing a coppice system.

中文翻译：

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桉树灌木丛再生的遗传控制。

摘要 森林公司更喜欢将矮林系统作为造林战略，因为与开发新的人工林相比，它具有经济和可持续性优势。然而，旨在确定为这种管理策略选择优良遗传材料的研究很少。在这项研究中，我们评估了桉树属的五种克隆试验。位于巴西圣保罗州的 Itatinga 和 Angatuba，以确定遗传相关性和对两次轮作再生管理生产力的控制。桉树的体积 (m3) 和存活率。在 5.5 岁时确定了两次轮换的克隆试验。试验以随机区组设计进行，有 6 个重复，每块地 5 株植物，不平衡处理。生存的正常尺度（ h^n2 \hat h_n^2 ）的遗传力范围为 0.056 至 0.11，广义的遗传力（ h^g2 \hat h_g^2 ）范围为 0.205 至 0.334，基因型相关性为正且高（0.71-0.86），并且对两个轮换的遗传均值具有统计学意义。第二轮中最佳克隆的排名与其在第一次选择中的排名相似（76%）。因此，对于被评估的材料，在管理丛林系统时不需要第二次测量来获得准确的选择。第二轮中最佳克隆的排名与其在第一次选择中的排名相似（76%）。因此，对于被评估的材料，在管理丛林系统时不需要第二次测量来获得准确的选择。第二轮中最佳克隆的排名与其在第一次选择中的排名相似（76%）。因此，对于被评估的材料，在管理丛林系统时不需要第二次测量来获得准确的选择。