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首页> 外文期刊>Polar biology >Sub-Arctic alpine Vaccinium vitis-idaea exhibits resistance to strong variation in snowmelt timing and frost exposure, suggesting high resilience under climatic change
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Sub-Arctic alpine Vaccinium vitis-idaea exhibits resistance to strong variation in snowmelt timing and frost exposure, suggesting high resilience under climatic change

机译：亚北极山痘苗病毒肺炎缺血性对雪花时序和霜冻暴露的强大变化呈现抵抗力，旨在在气候变化下的高弹性

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In tundra ecosystems, snow cover protects plants from low temperatures in winter and buffers temperature fluctuations in spring. Climate change may lead to reduced snowfall and earlier snowmelt, potentially exposing plants to more frequent and more severe frosts in the future. Frost can cause cell damage and, in combination with high solar irradiance, reduce the photochemical yield of photosystem II (phi(PSII)). Little is known about the natural variation in frost exposure within individual habitats of tundra plant populations and the populations' resilience to this climatic variation. Here, we assessed how natural differences in snowmelt timing affect microclimatic variability of frost exposure in habitats of the evergreenVaccinium vitis-idaeain sub-Arctic alpine Finland and whether this variability affects the extent of cell damage and reduction in phi(PSII). Plants in early melting plots were exposed to more frequent and more severe frost events, and exhibited a more pronounced decrease in phi(PSII), during winter and spring compared to plants in late-melting plots. Snowmelt timing did not have a clear effect on the degree of cell damage as assessed by relative electrolyte leakage. Our results show that sub-Arctic alpineV. vitis-idaeais currently exposed to strong climatic variation on a small spatial scale, similar to that projected to be caused by climate change, without significant resultant damage. We conclude thatV. vitis-idaeais effective in mitigating the effects of large variations in frost exposure caused by differences in snowmelt timing. This suggests thatV. vitis-idaeawill be resilient to the ongoing climate change.
机译：在苔原生态系统中，雪覆盖保护冬季低温的植物，并在春季缓冲温度波动。气候变化可能导致降低降雪和早期的雪花，潜在地暴露于未来更频繁，更严重的霜冻。霜会导致细胞损伤，并结合高太阳辐照度，降低光照Ⅱ的光化学产量（PHI（PSII））。对于苔原植物群体的个体栖息地的霜冻暴露的自然变化很少，并且群体对这种气候变异的恢复能力。在这里，我们评估了散雪时机的自然差异如何影响常绿血管内血管嗜胞菌群血症高山芬兰栖息地的微致血管暴露性的微观变异性，以及这种可变性是否会影响细胞损伤的程度和PHI（PSII）的程度。早期熔化地块的植物暴露于更频繁，更严重的霜冻事件，并在冬季和春季展示了比较融化的植物的冬季和春季更明显的降低。随着相对电解质泄漏评估的评估，散耕剂时序没有明显的细胞损伤程度。我们的结果表明，亚北极山。 Vitis-Idaeais目前暴露于小型空间尺度的强气候变化，类似于将受气候变化引起的投影，没有显着的结果损坏。我们得出结论。肺炎赤偶可有效地减轻雪花时机差异引起的冰霜暴露的大变化影响。这表明了。 Vitis-Idaeawill对持续的气候变化具有弹性。

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