Department of Renewable Resources, University of Alberta, 751 General Services Building, Edmonton, AB, T6G 2H1, Canada.
Chair of Forest Growth and Dendroecology, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany, 79106.
Nat Commun. 2018 Apr 23;9(1):1574. doi: 10.1038/s41467-018-04039-5.
With lengthening growing seasons but increased temperature variability under climate change, frost damage to plants may remain a risk and could be exacerbated by poleward planting of warm-adapted seed sources. Here, we study cold adaptation of tree populations in a wide-ranging coniferous species in western North America to inform limits to seed transfer. Using tree-ring signatures of cold damage from common garden trials designed to study genetic population differentiation, we find opposing geographic clines for spring frost and fall frost damage. Provenances from northern regions are sensitive to spring frosts, while the more productive provenances from central and southern regions are more susceptible to fall frosts. Transferring the southern, warm-adapted genotypes northward causes a significant loss of growth and a permanent rank change after a spring frost event. We conclude that cold adaptation should remain an important consideration when implementing seed transfers designed to mitigate harmful effects of climate change.
随着生长季节的延长和气候变化下温度变异性的增加，植物的霜害可能仍然是一个风险，而且温暖适应种子源的向极种植可能会加剧这种风险。在这里，我们研究了北美西部广泛分布的针叶树种群的冷适应能力，以了解种子转移的限制。我们利用共同花园试验的树木年轮特征来研究遗传种群分化，发现春霜和秋霜损害的地理渐变线是相反的。来自北部地区的种源对春霜敏感，而来自中部和南部地区的生产力更高的种源更容易受到秋霜的影响。将南部的温暖适应基因型向北转移会导致春季霜害事件后生长显著减少和永久等级变化。我们得出结论，在实施旨在减轻气候变化不利影响的种子转移时，冷适应仍然是一个重要的考虑因素。
