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首页> 外文期刊>Seed Science Research >Assessing tree germination resilience to global warming: a manipulative experiment using sugar maple (Acer saccharum)
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Assessing tree germination resilience to global warming: a manipulative experiment using sugar maple (Acer saccharum)

机译：评估树木发芽对全球变暖的适应力：使用糖枫（枫叶枫）的人工实验

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A climate warming of 2-5 degrees C by the end of the century will impact the likelihood of seed germination of sugar maple (Acer saccharum), a dominant tree species which possesses a restricted temperature range to ensure successful reproduction. We hypothesize that seed origin affects germination due to the species' local adaptation to temperature. We tested this by experimentally investigating the effect of incubation temperature and temperature shifting on sugar maple seed germination from seven different seed sources representing the current species range. Survival analysis showed that seeds from the northern range had the highest germination percentage, while the southern range had the lowest. The mean germination percentage under constant temperatures was best when temperatures were <= 5 degrees C, whereas germination percentages plummeted at temperatures >= 11 degrees C (5.8%). Cool shifting increased germination by 19.1% over constant temperature treatments and by 29.3% over warm shifting treatments. Both shifting treatments caused earlier germination relative to the constant temperature treatments. A climate warming of up to +5 degrees C is shown to severely reduce germination of seeds from the southern range. However, under a more pronounced warming of 7 degrees C, seed germination at the northern range become more affected and now comparable to those found from the southern range. This study states that the high seed germination percentage found in sugar maple at the northern range makes it fairly resilient to the warmest projected temperature increase for the next century. These findings provide forest managers with the necessary information to make accurate projections when considering strategies for future regeneration while also considering climate warming.
机译：到本世纪末2-5摄氏度的气候变暖将影响糖枫（Acer saccharum）的种子发芽的可能性，糖枫是一种优势树种，具有有限的温度范围以确保成功繁殖。我们假设由于物种对温度的局部适应，种子起源会影响发芽。我们通过实验研究孵育温度和温度变化对代表当前物种范围的七个不同种子来源的糖枫种子发芽的影响进行了测试。存活分析表明，北部范围的种子发芽率最高，而南部范围的种子发芽率最低。当温度<= 5摄氏度时，恒温条件下的平均发芽率最好，而当温度> = 11摄氏度时，发芽率则急剧下降（5.8％）。与恒温处理相比，冷移使发芽增加了19.1％，而温移处理使发芽增加了29.3％。相对于恒温处理，两种转移处理均引起较早的发芽。事实证明，高达+5摄氏度的气候变暖会严重减少南部地区种子的发芽。但是，在更明显的7摄氏度变暖下，北部范围的种子发芽受到的影响更大，现在可与南部范围的种子发芽相比。这项研究表明，在北部枫糖枫中发现的高种子发芽率使其对下一世纪最温暖的预计温度升高具有相当的抵抗力。这些发现为森林管理者提供了必要的信息，以便在考虑未来的再生策略并考虑气候变暖时做出准确的预测。

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