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Assessing effects of seed source and transfer potential of white birch populations using transfer functions

机译:利用转移函数评估白桦种群的种子来源和转移潜力

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Trees have adapted to their local climates, but with changes in the climate, they may currently or in the near future occupy climates that are sub-optimal for growth and survival. The goal of current reforestation is therefore to establish a new generation of trees with growth adapted to the future climate(s). Here, we present preliminary data of a study assessing the effects of seed source and transfer potential of white birch populations. Seeds from twenty-five white birch (Betula papyrifera Marsh.) populations collected acrossCanadawere grown in the greenhouse and observed for emergence time, germination and growth. The seedlings were later planted in a common garden. After one year, the seedlings were measured for height, root-collar diameter (RCD) and survival rate and average volume per seedling calculated. Transfer functions were used to estimate the climatic distance from which populations may be transferred to the test site. There was a significant effect of population on all growth variables. Initial height was positively correlated with 1-year height and survival. Germination rate negatively correlated with emergence time. Principal component analysis showed effects of seed origin on performances of the populations in the common garden. Summer temperature was the best predictor of the transfer distance.
机译:树木已经适应了当地的气候,但是随着气候的变化,树木可能会在当前或不久的将来占据生长和生存次佳的气候。因此,当前造林的目标是建立新一代树木,使其生长适应未来的气候。在这里,我们提出了一项评估白桦种群种子来源和转移潜力的研究的初步数据。从加拿大各地收集的二十五个白桦种群的种子在温室中生长,并观察其出苗时间,发芽和生长。幼苗随后被种植在公共花园中。一年后,测量幼苗的高度,根颈直径(RCD)以及成活率和每棵幼苗的平均体积。使用传递函数来估计人口可以从其转移到测试地点的气候距离。人口对所有增长变量都有显着影响。初始身高与1年身高和存活率呈正相关。发芽率与出苗时间呈负相关。主成分分析表明种子来源对普通花园中种群生长的影响。夏季温度是转移距离的最佳预测指标。

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