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.

极端气候事件对森林生态系统的影响表现为木材解剖结构的变化，它代表了气候档案木材中的长期记忆，并影响树木水力系统的功能。木材的解剖特性在遗传预定义和物种特异性的可塑性内发生反应，并且可以通过图像分析方法进行量化。木材解剖异常（例如年内密度波动）在地中海地区频繁发生，并记录了植被期内干旱期间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到限制生长的气候因素的年际变化的影响，反映了短期的气候变化，但根据高树龄，也反映了长期的气候变化。我们将沿着海拔梯度分析季节性气候对形成层活动、生长速率和形成的木材组织解剖结构的影响，其中包括科西嘉岛森林地区内的所有气候类型。该研究包括两种常绿松树物种（Pinus pinaster、Pinus nigra），它们的分布模式在研究的海拔梯度内重叠，从而可以区分影响木材形成的物种特定因素和环境因素。CorsicArchive 项目包内的合作将提供沿线的气象数据和气候模型。对木材和降水进行高程梯度和稳定氧同位素分析，具有高时间分辨率，并将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的极端气候事件，以更好地了解科西嘉岛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