Bell-shaped tree-ring responses to air temperature drive productivity trends in long-lived mountain Mediterranean pines
Bell-shaped tree-ring responses to air temperature drive productivity trends in long-lived mountain Mediterranean pines
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钟形树轮对气温的反应推动了长寿山区地中海松的生产力趋势
DOI：
10.1016/j.scitotenv.2023.164103
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发表时间：
2023
影响因子：
9.8
通讯作者：
Gentilesca, Tiziana
中科院分区：
文献类型：
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作者：
Piovesan, Gianluca;Rita, Angelo;Biondi, Franco;Baliva, Michele;Borghetti, Marco;Brunetti, Michele;De Vivo, Giuseppe;Di Filippo, Alfredo;Dinella, Anna;Gentilesca, Tiziana
本文研究了分布于海拔882 ~ 2143 m的长叶松（Pinus heldreichii）集合种群的年轮气候响应。从意大利亚平宁山脉南部的低山到亚高山植被带。检验的假设是，木材生长沿着海拔梯度是非线性相关的空气温度。在2012-2015年的三年实地考察中，我们在24个地点收集了214棵松树的木芯，胸径为19至180 cm（平均82.7 ± 32.9 cm）。我们使用了树轮和遗传的方法相结合，以揭示参与生长驯化的因素，使用空间换时间的方法。分数从典型对应分析被用来联合收割机个人树轮系列到四个复合年表相关的空气温度沿着海拔梯度。总体而言，6月的树木气候响应遵循钟形的热生态位曲线，增加，直到13-14 °C左右的峰值。一个类似的钟形响应，发现与以前的秋季气温，树木气候信号与茎的大小和生长速率相互作用，产生一个发散的生长响应之间的顶部和底部的海拔梯度。在没有干旱胁迫的情况下，亚高山带上部树木生长的增加与气温升高的后果是一致的。一个积极的联系被发现之间的松树生长在所有海拔和4月平均温度，树木生长在最低海拔显示出最强的增长反应。没有发现海拔遗传差异，因此，长寿树种与小的地理范围可能会扭转其气候反应之间的低，高生物气候带的环境生态位。我们的研究揭示了地中海森林的高抵抗力和适应能力，这种对气候条件变化的低脆弱性突出了未来几十年在这些生态系统中储存碳的潜力。
We investigated the dendroclimatic response of aPinus heldreichiimetapopulation distributed over a wide elevation interval (from 882 to 2143 m a.s.l.), spanning from low mountain to upper subalpine vegetation belts in the southern Italian Apennines. The tested hypothesis is that wood growth along an elevational gradient is non-linearly related to air temperature. During three years of fieldwork (2012–2015) at 24 sites, we collected wood cores from a total of 214 pine trees with diameter at breast height from 19 to 180 cm (average 82.7 ± 32.9 cm). We used a combination of tree-ring and genetic methods to reveal factors involved in growth acclimation using a space-for-time approach. Scores from canonical correspondence analysis were used to combine individual tree-ring series into four composite chronologies related to air temperature along the elevation gradient. Overall, the June dendroclimatic response followed a bell-shaped thermal niche curve, increasing until a peak around 13–14 °C. A similarly bell-shaped response was found with previous autumn air temperature, and both dendroclimatic signals interacted with stem size and growth rates, generating a divergent growth response between the top and the bottom of the elevation gradient. Increased tree growth in the upper subalpine belt was consistent with the consequences of increasing air temperature under no drought stress. A positive link was uncovered between pine growth at all elevations and April mean temperature, with trees growing at the lowest elevations showing the strongest growth response. No elevational genetic differences were found, hence long-lived tree species with small geographical ranges may reverse their climatic response between the lower and upper bioclimatic zones of their environmental niche. Our study revealed a high resistance and acclimation capability of Mediterranean forest stands, and such low vulnerability to changing climatic conditions highlights the potential to store carbon in these ecosystems for the coming decades.