The interrelation of carbon and water balance in beech-dominated forests - from leaf level water use efficiency to stand and area scale assessments

在山毛榉和竞争植被的碳（C）平衡和水的关系之间的相互作用的气候和气候相关的环境条件的影响进行了评估。从叶水平到面积尺度，我们将结合联合收割机（a）天然丰度稳定同位素分析和建模，（B）水和C通量分析和（c）补充碳运输模块的树木水动力学模型。在叶水平上，我们专注于叶肉电导率的影响和水利用效率的战略，一方面和同位素分馏模型的影响，另一方面，它的重要性。在植物水平上，我们将评估碳和水的运输和代谢物通量应用稳定同位素示踪剂。在研究小组FOR 788开发的树木流体动力学模型将耦合到韧皮部流动和C运输模型和同位素分馏模块将被纳入。为了将树木年轮中编码的生理信息提升到生态系统和区域尺度，我们将联合收割机同位素景观（isoscape）方法与氧和C稳定同位素建模相结合。水和碳平衡的实验和基于模型的评估以及叶，树和景观水平上的竞争性相互作用将密切相关，并耦合到该应用包的第二个项目开发的机械林分建模方法移动的。

The interactions between the carbon (C) balance and the water relations in beech and competing vegetation as affected by climate and climate-related environmental conditions are assessed. Spanning this characterisation from the leaf level to the area scale we will combine (a) natural abundance stable isotope analysis and modelling, (b) water and C flux analysis and (c) a tree hydrodynamic model supplemented with a carbon transport module. On the leaf level we focus on the effects of mesophyll conductance and its importance for water use efficiency strategies on the one hand and its effects on isotope fractionation models on the other hand. On the plant level we will assess C and water transport and metabolite fluxes applying stable isotope tracers. The tree hydrodynamic model developed in the research group FOR 788 will be coupled to a phloem flow and C transport model and isotope fractionation modules will be incorporated. For upscaling the physiological information encoded in tree rings to the ecosystem and area scale we will combine isotopic landscape (isoscape) approaches with oxygen and C stable isotope modelling. The experimental and model-based assessments of the water and C balance and of competitive interactions on the leaf, tree and landscape level will be closely related and coupled to the mechanistic stand modelling approach MoBiLE developed by the 2nd project of this application bundle.