预计冬季变暖不太可能影响加拿大大西洋地区香脂冷杉再生的发芽成功率,Forestry

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预计冬季变暖不太可能影响加拿大大西洋地区香脂冷杉再生的发芽成功率
Forestry ( IF 3.0 ) Pub Date : 2022-06-13 , DOI: 10.1093/forestry/cpac019
William Robert Vaughn ₁ , Anthony R Taylor _{1,

2}

Affiliation

气候变暖有可能在 21 世纪影响森林组成和物种补充。尽管这些影响中的许多预计将在生长季节发生，但重要的生活史事件，如种子休眠释放，可能会在冬季受到影响。香脂冷杉 (Abies balsamea (L.) Mill.) 的种子要发芽，它们需要很长的冷分层期来打破种子休眠，而在温暖的冬季可能不会经历这种休眠。此外，在加拿大大西洋地区，香脂冷杉种群经历了非常不同的气候。这些香脂冷杉种群的遗传学差异及其对当地环境的适应可能会导致种群对冬季变暖的反应发生变化。在这项研究中，我们从加拿大大西洋地区的四个不同种子产地中选择了三个香脂冷杉苗圃，并在室外种子地块中对它们进行了模拟冬季变暖，从 12 月到 4 月，这些地块被加热到高于环境温度约 6°C。与我们的假设相反，加热香脂冷杉种子的发芽成功率相对于对照没有显着降低，并且变暖和种子起源区之间没有相互作用。一些种子产地的种子区对变暖的反应各不相同，这表明来自相似气候的种群之间的休眠水平存在很大差异。香脂冷杉种群中表型表达的这种多样性可能会提高该物种在未来气候变化下的恢复力。

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Projected winter warming unlikely to affect germination success of balsam fir regeneration in Atlantic Canada

Climate warming has the potential to influence forest composition and species recruitment over the course of the 21st century. Although many of these impacts are expected to occur during the growing season, important life history events, like seed dormancy release, may be affected during the winter. For seeds of balsam fir (Abies balsamea (L.) Mill.) to germinate, they require a lengthy cold stratification period to break seed dormancy, which may not be experienced under warmer winters. Moreover, within Atlantic Canada, balsam fir populations experience very different climates. Dissimilarities among the genetics of these balsam fir populations and adaptations to their local environments may engender variations in population response to winter warming. In this study, we selected three balsam fir seedlots each from four different seed origin zones within Atlantic Canada and subjected them to simulated winter warming in outdoor seed plots that were heated to ≈ 6°C above the ambient temperature from December to April. Contrary to our hypotheses, germination success of the heated balsam fir seeds did not significantly decrease relative to the controls, and there was no interaction between warming and seed origin zone. Seedlots of some seed origin zones exhibited variable responses to warming, suggesting that dormancy levels substantially differ among populations from similar climates. This diversity in phenotype expression within balsam fir populations may improve this species resilience under future climate change.

更新日期：2022-06-13

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