Influence of forest structure and site differences on drought stress responses of native and non-native tree species as a guide to establishing climate-tolerant forests

The project investigates and directly compares the drought stress tolerance of four tree species, including two native species (Scots pine, Pinus sylvestris, and oak, Quercus spp.) and two non-native species (black cherry, Prunus serotina, and black locust, Robinia pseudoacacia). The aim is to assess how forest structure and site conditions influence drought responses, growth dynamics, and vitality under recent extreme drought events.

Using high-resolution structural measurements, detailed site and root analyses, dendrochronological data, and stable isotope analyses (δ13C, δ18O), the project links tree growth and drought stress to water availability, competition, and forest structure. The results will improve the understanding of site-dependent climate tolerance and support science-based decisions for establishing stable and climate-resilient forests.

Recent drought years have caused severe damage to forests in Germany. This project examines which tree species cope best with drought and under which site conditions they remain healthy and productive.

Four tree species are compared: two native species that are important for forestry, and two non-native species that are often debated but have shown high drought tolerance in recent years. By analysing tree growth, water availability, and forest structure, the project aims to identify which species combinations and site conditions can help forests better withstand future droughts. The results will support the development of more resilient forests under climate change.