Modeling beech-dominated deciduous forest development based on competitive mechanisms of water and nitrogen partitioning

在788研究组中，我们调整、进一步开发和应用了模拟图特林根测量站点林分尺度过程和水、碳和氮通量的模型。基于这些成果，目前的应用主要集中在模拟成熟树木和再生树木之间的地上和地下竞争，以及植物和微生物之间的竞争。我们将使用MoBiLE模拟框架以及参数化和评估良好的部门生物圈模型，包括小气候、营养和水供应、植物生理学和树木生长。增长模型将得到改进，以考虑确定特定社会树类竞争强度所需的大小特定干旱效应。这些改进依赖于伙伴项目P1的调查结果。模型系统将在现场和区域范围内进行评估-也与合作伙伴项目合作。它还将用于探索小气候（西北坡与西南坡）对种内和种间竞争反馈的影响，从而评估竞争对林分发展的重要性。此外，我们将分析系统对预测的环境条件变化的反应，以及林分发展的一系列管理选择（回顾性和预测性）。因此，将评估钙质土壤上山毛榉主导森林的区域生长潜力和立地限制。

In the research group 788 we have adapted, further developed and applied models for simulating stand scale processes and fluxes of water, C and N at the Tuttlingen measurement site. Based on these achievements, the current application focuses on simulation of aboveground and belowground competition between mature trees and regeneration as well as between plants and micro-organisms. We will use the simulation framework MoBiLE together with well parameterized and evaluated sectoral biosphere models that cover microclimate, nutrient and water supply, plant physiology, and tree growth. The growth model will be improved to consider size specific drought effects that are needed to determine the competition strength of a particular social tree class. These improvements rely on the investigation results of the partner project P1. The model system will be evaluated on site and regional scale – also in cooperation with the partner project. It will also used for exploring the effect of microclimate (NW-versus SW slope) on feedbacks between intra- and inter specific competition and thus, for assessing the importance of competition for stand development. Furthermore, we will analyze system responses to predicted changes in environmental conditions and a range of management options on stand development (retrospective and prognostic). Thus, regional growth potentials and site limits for beech dominated forests on calcareous soils will be assessed.