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

在研究小组788中，我们调整、进一步开发和应用了模型，用于模拟Tuttlingen测量点的林分尺度过程和水、C和N的通量。在这些成果的基础上，目前的应用主要集中在成熟树木与更新之间以及植物与微生物之间的地上和地下竞争模拟。我们将使用MOBILE模拟框架和经过充分参数化和评估的部门生物圈模型，这些模型涵盖小气候、养分和供水、植物生理学和树木生长。生长模型将得到改进，以考虑特定大小的干旱影响，这是确定特定社会树种的竞争实力所必需的。这些改进有赖于伙伴项目P1的调查结果。示范系统将在现场和区域范围内--也与伙伴项目合作--进行评估。它还将用于探索小气候(西北与西南坡度)对种内和种间竞争之间反馈的影响，从而评估竞争对林分发展的重要性。此外，我们将分析系统对环境条件预测变化的反应，以及林分发展的一系列管理选择(回溯性和预测性)。因此，将评估石灰性土壤上以山毛榉为主的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.