Abstract Trees with high levels of growth stress begin to show log end splits (LES) immediately after harvesting, usually reaching its maximum end split in a week, and these tensions also create splits during lumber manufacturing. Interlocked grain is another characteristic that impacts the properties of eucalyptus wood. The aim of this study was to evaluate the effect of growth stress and interlocked grain patterns on log end splitting of seven different hybrid clones of Eucalyptus grandis × Eucalyptus urophylla planted in Brazil. The growth stress indicator (GSI) was measured in standing trees before harvesting. Splits were measured on logs in three different stages, and interlocked grain from wood blocks was obtained across the center of the cross-section. The results showed that LES occurred as soon as the trees were harvested; however, for better selection of clones, LES should be evaluated after a week of harvesting. There were statistically significant correlations for GSI with LES. Clones that presented higher values of interlocked grain tended to develop lower values of GSI and LES. Using GSI and interlocked grain measurements, it was possible to select the most indicated eucalyptus clones for lumber production.

中文翻译：

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生长胁迫和互锁纹对大桉×尾叶桉木7种不同杂交无性系分裂的影响

摘要 具有高水平生长压力的树木在收获后立即开始出现原木端裂 (LES)，通常在一周内达到最大端裂，这些张力也会在木材制造过程中产生裂痕。互锁纹理是影响桉木特性的另一个特征。本研究的目的是评估生长胁迫和互锁谷物模式对种植在巴西的大桉 × 尾叶桉的 7 个不同杂交无性系的对数末端分裂的影响。生长压力指标 (GSI) 是在收获前在立树上测量的。分三个不同阶段在原木上测量劈裂，并在横截面的中心获得木块的互锁纹理。结果表明，一旦树木被收获，LES 就会发生；然而，为了更好地选择克隆，应在收获一周后评估 LES。GSI 与 LES 存在统计学上显着的相关性。具有较高互锁谷物值的克隆往往会产生较低的 GSI 和 LES 值。使用 GSI 和互锁谷物测量，可以选择最适合木材生产的桉树克隆。