Johannes Sauer


Born in Göttingen, grown up in Brunswick. Returned to Göttingen to study forest-science at the University of Göttingen. Topic of Bachelor thesis was “Seasonal dynamics of leaf area index in relation to meteorological parameters” and in Master thesis, finished in 2017, the topic was: “Hydraulic redistribution by poplars in a greenhouse and an agroforestry system”. While his studies, he worked as a student assistant in the department of soil science. Since October 2017 part of the research training program (RTG 2300). Interested in finding patterns about the interaction of mixed tree species and their benefits or constraints on forest growth and performance.

PhD Research Project

In this subproject we will focus on species interactions and growth on a tree to tree level. We will examine the crown structure of neighboring trees of the same or unequal species and study the efficiency of tree growth. The structural crown parameters like crown base and branchiness are also of importance to estimate assortments and to derive tree value and wood quality. All results will be integrated into a forest growth modeling software. A single tree growth model will be used to design and evaluate mixed species stand treatment by computer simulation and to develop silviculture guidelines for the field application.
Structure and dynamics of pure and mixed stands of European beech, Norway spruce, and Douglas-fir


  • Sauer J, Sennhenn-Reulen H, Nagel J (2018) Struktur und Dynamik von Mischbeständen mit Buche, Fichte und Douglasie. In: Klädtke J, Kohnle U (eds): Deutscher Verband Forstlicher Forschungsanstalten, Conference Report 2018: Sektion Ertragskunde. Jahrestagung 14.–16.05.2018, Vígľaš/Slowakia. ISSN 1432-2609