Climatic impact on functional wood anatomy, seasonal wood formation, and tree growth along altitudinal gradients on Corsica

气候对科西嘉岛功能性木材解剖结构、季节性木材形成和沿海拔梯度的树木生长的影响

• 批准号: 318196965
• 负责人: Professor Dr. Achim Bräuning
• 金额: --
• 依托单位: Institut für Geographie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/318196965?language=en
• 关键词: Climatic; impact; functional; wood; anatomy

The impact of climate extreme events on forest ecosystems is manifested in structural changes of the wood anatomy which represents a long-term memory in the climate archive wood and which influence the functionality of the hydraulic system of trees. Wood anatomical properties react within genetically predefined and species-specific plasticity and can be quantified with image analytical approaches. Wood anatomical anomalies like intra-annual density fluctuations occur in a high frequency within the Mediterranean region and document the response of cambial activity and cell differentiation in dry spells within the vegetation period. The temporal dynamics ofcambial activity and differencing wood tissues is influenced by interannual variations of growth-limiting climate factors and mirrors shortterm, but according to high tree ages also long-term climate variability. We will analyze the impact of seasonal climate on cambial activity, growth rates, and formed wood tissues`anatomy along an elevation gradient that includes all climatic types within forested regions on Corsica. The study includes tow evergreen pine species (Pinus pinaster, Pinus nigra) whose distribution patterns overlap within thestudied elevation gradient, allowing a differentiation between speciesspecific and environmental factors influencing wood formation.Collaborations within the project bundle CorsicArchive will provide meteorological data and climatological models along the elevationgradient as well as stable oxygen isotope analyses of wood and precipitation water with high temporal resolution and will allow aclimatological and tree physiological interpretation of the measured growth processes and wood structures. These data will be integratedin a tree-growth-stable isotope model DendroIso and applied on former climatic extreme events during the past centuries to gain abetter understanding of the hydroclimatic variability during different climate periods on Corsica, and on their effects on tree ecology.

气候极端事件对森林生态系统的影响表现为木材解剖结构的变化，这代表了气候档案木材的长期记忆，并影响了树木液压系统的功能。木材解剖特性在遗传预定义和物种特异性可塑性内反应，可以用图像分析方法量化。木材解剖异常，如年内密度波动，在地中海地区频繁发生，记录了植被期干旱期形成层活动和细胞分化的反应。形成层活动和木材组织差异的时间动态受生长限制气候因子年际变化的影响，反映了短期的气候变化，但根据树木的高年龄也反映了长期的气候变化。我们将分析季节性气候对形成层活动的影响，生长速度，以及形成的木材组织解剖沿海拔梯度，包括在科西嘉森林地区的所有气候类型。该研究包括两种常绿松树（Pinus pinaster和Pinus nigra），它们的分布模式在研究的海拔梯度内重叠，从而区分了影响木材形成的物种特异性和环境因素。CorsicArchive项目包内的合作将提供沿海拔梯度的气象数据和气候模型，以及木材和降水的稳定氧同位素分析，具有高时间分辨率，并允许对测量的生长过程和木材结构进行气候学和树木生理学解释。这些数据将被整合到树木生长稳定同位素模型DendroIso中，并应用于过去几个世纪以前的极端气候事件，以更好地了解科西嘉不同气候时期的水文气候变化及其对树木生态的影响。

项目成果

The Dry and the Wet Case: Tree Growth Response in Climatologically Contrasting Years on the Island of Corsica

• DOI: 10.3390/f12091175
• 发表时间: 2021-08
• 期刊: Forests
• 影响因子: 2.9
• 作者: M. Häusser;S. Szymczak;Isabel Knerr;J. Bendix;É. Garel;F. Huneau;K. Trachte;S. Santoni;A. Bräuning