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首页> 外文期刊>Oecologia >Climatic events inducing die-off in Mediterranean shrublands: are species' responses related to their functional traits?
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Climatic events inducing die-off in Mediterranean shrublands: are species' responses related to their functional traits?

机译：气候事件在地中海灌木丛中致死：物种的反应与它们的功能性状相关吗？

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摘要

Extreme climatic episodes, likely associated with climate change, often result in profound alterations of ecosystems and, particularly, in drastic events of vegetation die-off. Species attributes are expected to explain different biological responses to these environmental alterations. Here we explored how changes in plant cover and recruitment in response to an extreme climatic episode of drought and low temperatures were related to a set of functional traits (of leaves, roots and seeds) in Mediterranean shrubland species of south-west Spain. Remaining aerial green cover 2 years after the climatic event was positively related to specific leaf area (SLA), and negatively to leaf water potential, stable carbon isotope ratio and leaf proline content. However, plant cover resilience, i.e. the ability to attain pre-event values, was positively related to a syndrome of traits distinguished by a higher efficiency of water use and uptake. Thus, higher SLA and lower water-use efficiency characterized species that were able to maintain green biomass for a longer period of time but were less resilient in the medium term. There was a negative relationship between such syndromes and the number of emerging seedlings. Species with small seeds produced more seedlings per adult. Overall, recruitment was positively correlated with species die-off. This study demonstrates the relationship between plant traits and strong environmental pulses related to climate change, providing a functional interpretation of the recently reported episodes of climate-induced vegetation die-off. Our findings reveal the importance of selecting meaningful traits to interpret post-event resilience processes, particularly when combined with demographic attributes.
机译：可能与气候变化有关的极端气候事件通常会导致生态系统发生深刻变化，尤其是导致植被死亡的剧烈事件。物种属性有望解释对这些环境变化的不同生物学反应。在这里，我们探索了西班牙西南部地中海灌木林物种因干旱和低温的极端气候事件而发生的植物覆盖和吸收变化与一组功能性状（叶片，根和种子）之间的关系。气候事件后2年剩余的空中绿盖与特定叶面积（SLA）正相关，与叶水势，稳定的碳同位素比和脯氨酸含量负相关。然而，植物的覆盖弹性，即达到事前值的能力，与以较高的水利用和吸收效率为特征的性状综合症正相关。因此，较高的SLA和较低的用水效率表征了能够在更长的时间内保持绿色生物量，但在中期却缺乏弹性的物种。这种综合征与出苗的数量之间存在负相关关系。具有小种子的物种每个成年人产生更多的幼苗。总体而言，招聘与物种死亡呈正相关。这项研究证明了植物性状与与气候变化有关的强烈环境脉冲之间的关系，为最近报道的气候诱发的植被死亡事件提供了功能解释。我们的发现揭示了选择有意义的特征来解释事后复原力过程的重要性，尤其是结合人口统计属性时。

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