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Climate warming differently affects Larix decidua ring formation at each end of a French Alps elevational gradient
Annals of Forest Science ( IF 3 ) Pub Date : 2020-06-01 , DOI: 10.1007/s13595-020-00958-w
Philippe Rozenberg , Thibaud Chauvin , Margarita Escobar-Sandoval , Frédéric Huard , Vladimir Shishov , Jean-Paul Charpentier , Anne-Sophie Sergent , J. Jesus Vargas-Hernandez , Alejandro Martinez-Meier , Luc Pâques

The ongoing global warming tends to reduceLarix deciduaradial growth and ring wood density at the bottom of an elevational gradient in the French Alps, while it has a less marked effect at the top. The ongoing climate warming affects most tree species across their biogeographic distribution range. The bottom and the top of an elevational gradient are appropriate environments to observe the effect of climate warming in contrasted temperature conditions. To retrospectively study the effect of the ongoing climate warming on Larix decidua trees located in warm and cold conditions, i.e., at the bottom (1200 m) and the top (2300 m) of an elevational gradient, respectively. Dendroecological analysis of two groups of Larix decidua trees located at very low (1200 m) and very high (2300 m) elevations. Construction of climatic response curves for annual ring variables. Decomposition of the variance of the response models into their high and low frequency components. At Briançon, in the French Alps, the increase of the daily maximum temperature during the last 50 years is already almost 3 °C for the March–October period. The results reveal contrasted behaviors at both ends of the investigated elevational gradient. Basal area increment, ring width, and their earlywood and latewood components increase or level off at the top of the gradient, while they all strongly decrease at the bottom. At the bottom, the low frequency warming effect explains the recent ring width decrease, with no influence of the high frequency temperature variation. At the top, both the low frequency warming effect and the high frequency temperature effect explain each about half of the ring width variation encompassed by the model. Latewood density displays the same trend as ring width, while earlywood density decreases at both ends of the gradient. Such opposed trends of the radial growth time trends between the top (2300 m) and the bottom (1200 m) of the gradient reflects the respectively favorable and unfavorable effects of climate warming at such ends of this Larix decidua elevational gradient. We propose that the strong ring width decrease observed at the warmer bottom announces a coming dieback. The corresponding wood density decrease will affect wood hydraulic properties in a way that is unclear.

中文翻译:

气候变暖对法国阿尔卑斯山海拔梯度两端落叶松环形成的影响不同

持续的全球变暖趋向于降低法国阿尔卑斯山海拔梯度底部的落叶松落叶生长和年轮材密度,而顶部的影响则不那么明显。持续的气候变暖影响了其生物地理分布范围内的大多数树种。海拔梯度的底部和顶部是观察气候变暖在对比温度条件下的影响的合适环境。回顾性研究持续气候变暖对位于温暖和寒冷条件下的落叶松树的影响,即分别位于海拔梯度的底部(1200 m)和顶部(2300 m)。位于极低(1200 m)和极高(2300 m)海拔的两组落叶松树的树木生态学分析。构建年轮变量气候响应曲线。将响应模型的方差分解为其高频和低频分量。在法国阿尔卑斯山的布里昂松,3 月至 10 月期间,过去 50 年的每日最高气温已经上升了近 3°C。结果揭示了调查的海拔梯度两端的对比行为。基底面积增量、年轮宽度以及它们的早材和晚材成分在梯度顶部增加或趋于平稳,而在底部均显着减少。在底部,低频变暖效应解释了最近环宽的减少,而不受高频温度变化的影响。在顶部,低频变暖效应和高频温度效应都解释了模型所包含的环宽变化的大约一半。晚材密度呈现与年轮宽度相同的趋势,而早材密度在梯度两端均呈下降趋势。梯度顶部 (2300 m) 和底部 (1200 m) 之间径向生长时间趋势的这种相反趋势反映了气候变暖在落叶松海拔梯度的这些端部的有利和不利影响。我们认为,在温暖的底部观察到的环宽大幅减少预示着即将到来的枯萎。相应的木材密度降低将以一种尚不清楚的方式影响木材的水力特性。而早材密度在梯度的两端都下降。梯度顶部 (2300 m) 和底部 (1200 m) 之间径向生长时间趋势的这种相反趋势反映了气候变暖在落叶松海拔梯度的这些端部的有利和不利影响。我们认为,在温暖的底部观察到的环宽大幅减少预示着即将到来的枯萎。相应的木材密度降低将以一种尚不清楚的方式影响木材的水力特性。而早材密度在梯度的两端都下降。梯度顶部 (2300 m) 和底部 (1200 m) 之间径向生长时间趋势的这种相反趋势反映了气候变暖在落叶松海拔梯度的这些端部的有利和不利影响。我们认为,在温暖的底部观察到的环宽大幅减少预示着即将到来的枯萎。相应的木材密度降低将以一种尚不清楚的方式影响木材的水力特性。我们认为,在温暖的底部观察到的环宽大幅减少预示着即将到来的枯萎。相应的木材密度降低将以一种尚不清楚的方式影响木材的水力特性。我们认为,在温暖的底部观察到的环宽大幅减少预示着即将到来的枯萎。相应的木材密度降低将以一种尚不清楚的方式影响木材的水力特性。
更新日期:2020-06-01
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