Comparison of inter- and intra-annual growth dynamics and drought response of European beech (Fagus sylvatica L.) and Norway spruce (Picea abies (L.) Karst.) along an altitudinal gradient

预期的全球变化对挪威云杉和欧洲山毛榉的生长和生产力的影响仍然是有争议的讨论。分析不同环境条件下的年际和年内生长动态，将详细了解树干径向生长对气候极端事件和环境变化的恢复力和适应潜力。德国西部自1990年以来，在海拔1250米和1997年以来，在海拔450米和750米处，用高时间分辨率（每15分钟一次）的自动精密点式树木生长计记录了山毛榉和云杉样本树的树干径向位移。在观测期间，对这些地点的气象和土壤参数进行了测量。将提供补充环境数据，包括附近德国联邦环境署环境监测站“绍因斯兰”对流层二氧化碳浓度测量的高分辨率时间序列。为扩大回顾性分析的范围，我们会在三个地点分别抽取测树仪树木和邻近树木的茎盘和生长量核心样本，并采用创新的方法，将长期测树仪数据与树木年轮特征（如年轮宽度、细胞结构、年内密度分布），以及详细研究形成层活动和木材形成的数据结合起来，提供了一个很好的机会，加深我们对不同环境因素与德国林业两个重要树种的短期，中期和长期生长动态的相互作用的理解和知识。

The impact of anticipated global change on growth and productivity of Norway spruce and European beech is still discussed controversially. The analysis of inter- and intra-annual growth dynamics in different environmental conditions will provide detailed insight into the resilience and adaption potential of stem radial growth to climatic extreme events and environmental changes.This study will be based on the exploitation of already existing unique long dendrometer time series collected at three dendroecological field sites of the Institute for Forest Growth along an altitudinal gradient in south-western Germany. At the three field sites, stem radial displacement of beech and spruce sample trees has been recorded by automatic precision point dendrometers in high temporal resolution (every 15 minutes) since 1990 at an altitude of 1250 m and since 1997 in addition at 450 m and 750 m. At these sites meteorological and pedological parameters have been measured during this observation period. Complementary environmental data, including high resolution time series of tropospheric CO2 concentration measurements from the nearby environmental monitoring station "Schauinsland" of the German Federal Environmental Agency (Umweltbundesamt) will be available. For extension of the retrospective analyses, stem discs and increment cores of dendrometer trees and neighboring trees will be sampled at each of the three sites.The innovative approach of combining long-term dendrometer data with tree ring features such as ring width, cell structure, intra-annual density profiles and data from detailed studies on cambial activity and wood formation, provides a great opportunity to deepen our understanding and knowledge about the interactions of different environmental factors with the short-, medium- and long-term growth dynamics of the two important tree species in German forestry.