ABSTRACT

In clonal forestry, eucalypts are propagated by stem cuttings on a large scale. Six-month-old seedlings of 20 seedlots of Eucalyptus camaldulensis were propagated by stem cuttings and segregated according to their pre-harvest position (apical, mid-position and apical) in the parent shoot. ‘Rooted (%)’ – the number of cuttings rooted as a percentage of the original number – was compared to climatic data from near the sites of seed collection. Seedlot mean rooted (%) tended to vary with the warmth of the native climate, suggesting that warm-climate seedlots were less well-adapted to the cool conditions that prevailed. Apical cuttings had the highest rooted (%) compared to mid-position and basal cuttings, suggesting variation in the unrooted survival of cuttings rather than in the rooting ability of the survivors. The results indicate the likelihood of seedlot $\times$ propagation system interactions in E. camaldulensis when propagated by stem cuttings.

摘要

在克隆林业中，桉树通过茎扦插进行大规模繁殖。Eucalyptus camaldulensis 20苗6个月大苗扦插繁殖，并根据其在亲本枝条中的收获前位置（顶端、中间位置和顶端）进行分离。'Rooted (%)' - 以原始数量百分比计的插条数量 - 与种子采集地点附近的气候数据进行了比较。种地平均生根率 (%) 往往会随着当地气候的温暖而变化，这表明温暖气候的种地不太适应盛行的凉爽条件。与中间位置和基部插条相比，顶端插条的生根率最高（％），这表明插条的无根存活率而不是幸存者的生根能力存在差异。结果表明种子的可能性$\times$通过茎插繁殖时E. camaldulensis的繁殖系统相互作用。