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Tobias Modrow

PhD candidate

Tobias Modrow

    Tennenbacherstr. 4
    79085 Freiburg im Breisgau     


    Room 04088
    Tel. ++49 0761/203-8628
    Fax ++49 0761/203-3781





Project: KlimaQuer: Conservation of drought tolerant and ecological valuable sessile oak (Quercus petraea) forests through natural regeneration 

The aim of this project is to provide forest managers with recommendations regarding the minimum size of canopy openings as well as the timing and extent of tending measures in oak-dominated forests. These recommendations are intended to ensure the successful establishment of a regeneration of sessile oak. Accordingly we are try to identify optimal light conditions allowing sessile oak a) to regenerate and b) to be competitive enough to minimize costs for measures usually needed to regulate concurrent vegetation.

In this project, the growth and competitiveness of sessile oak regeneration will be investigated by applying light measurements, along a maximum radiation and site gradient. In addition, a relationship between height growth and vitality of oak regeneration and the size of canopy openings will be analyzed. The value of this research project lies in the description of the oak regeneration process over the largest possible radiation gradient (light availability); the quantification of competing vegetation over several developmental stages of regeneration; the description of the importance of sunflecks for oak regeneration and its responsiveness regarding root growth after liberation from competition and shade.

Publications in peer reviewed journals

3. Kuehne, C., Pyttel, P., Modrow, T., Kohnle, U., Bauhus, J. (2020): Seedling development and regeneration success after ten years following group selection harvesting in a sessile oak (Quercus petraea [Mattuschka] Liebl.) stand. Annals of Forest Science 77, 71.

2. Kohler, M., Pyttel, P., Kuehne, C., Modrow, T., Bauhus, J. (2020): On the knowns and unknowns of natural regeneration of managed sessile oak (Quercus petraea (Matt.) Liebl.) forests – a literature review. Annals of Forest Science 77, 101.

1. Modrow, T., Kuehne, C., Saha, S., Bauhus, J., Pyttel, P. (2020): Photosynthetic performance, height growth, and dominance of naturally regenerated sessile oak (Quercus petraea [Mattuschka] Liebl.) seedlings in small-scale canopy openings of varying sizes. European Journal of Forest Research 139: 41–52.


Other publications

1. Modrow, T., Pyttel, P. (2019): Verjüngung der Traubeneiche. AFZ-Der Wald 18: 32-34. (PDF)



Modrow, T. (2016): Einfluss von Überschirmung, Konkurrenz und Wildverbiss auf Wachstum und Entwicklung von Traubeneichennaturverjüngung. Masterarbeit an der Professur für Waldbau, Albert-Ludwigs-Universität Freiburg.

Modrow, T. (2014): Feldstudie zum Vergleich von Feinwurzelparametern junger Stiel- und Zerreichen. Bachelorarbeit an der Professur für Waldbau, Albert-Ludwigs-Universität Freiburg.


Contributions to national and international conferences

Modrow, T., Pyttel, P., Bauhus, J. (2017): Einfluss von Überschirmung, Konkurrenz und Wildverbiss auf Wachstum und Entwicklung von Traubeneichennaturverjüngung. Vortrag im Rahmen der Sektionstagung Waldbau. 11.-12. September 2017, Tharand.



Jägercorps der Freiburger Forststudenten

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