Piano Provenzana的树木记录了近一个世纪的埃特纳火山活动
Trees of Piano Provenzana recorded Mt. Etna activity for almost a century
AI总结：
本研究利用埃特纳火山东北裂谷带的树木年轮记录，验证了其可约束近百年玄武岩火山事件规模，发现喷发体积与年轮生长显著相关，提出地下流体运移促进树木生长的机制，为古火山活动研究提供了新途径。
摘要：
了解过去的火山喷发对于提升社会对未来灾害的抵御能力、制定合理的应对方案至关重要。对于喷发频率较低（每30年或更久喷发一次）的火山，其过往喷发的记录通常十分匮乏，尤其是现代观测手段出现之前的事件，这有时会让火山灰沉积等研究与更近期的观测结果难以关联。本研究表明，树木年轮生长记录可用于约束约100年时间跨度内玄武岩火山事件的规模。为验证该方法，我们在埃特纳火山东北裂谷带采集了松树样本，发现自1925年以来这些树木的生长受到了火山活动的影响，且喷发体积与树木年轮生长变化存在相关性（r>0.7，p<0.005，样本包含14次喷发事件与48棵树木）。我们提出，在岩浆到达地表之前，地下流体（水、水中携带的营养物质，可能还有SO₂/CO₂）的运移会促进树木生长。这些结果表明，生长在火山上的树木可用于记录过往火山活动，也有助于理解深部岩浆源在岩浆侵位准备过程中的作用。
英文摘要：
Understanding past volcanic eruptions is essential to improve the resilience of societies to future events and to establish appropriate response plans. For volcanoes which are not the most active (one eruption every 30 yrs or less), documentation of past eruptions is often scarce, especially for those preceding modern measurements, making sometimes challenging the connection between studies such as those based on ash deposits and more recent observations. In this study we show that tree-ring growth records can help to constrain the size of basaltic events over a time-span of approximately 100 years. In order to validate our approach, we sampled pine trees along the north-east rift zones of Mt. Etna and show the growth of these trees has been impacted since 1925, and that erupted volumes correlate with change in tree-ring growth (r>0.7, p<0.005, n=14 events and 48 trees sampled). We propose that tree growth is enhanced by transport of fluids (water, nutrients within the water and potentially SO2/CO2) within the subsurface before magma reach the surface. These results suggest that trees growing on volcanoes may be useful in documenting past volcanic activity and in understanding the role of deep magmatic sources in the preparation of magma intrusions.
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