Research interests

My scientific focus is on research into both short-term and long-term strategies for adapting forests to the negative consequences of climate change.



Career and education

Since 09/2023

Scientist at the WSL on silviculture and climate change

10/2022- 09/2023


Scientific coordinator of the DFG Collaborative Research Centre "ECOSENSE" at the Chair of Ecosystem Physiology at the University of Freiburg.



Scientific employee at the Chair of Silviculture at the Albert-Ludwigs-University Freiburg as assistant to Prof Dr Jürgen Bauhus.


Scientific employee at the Chair of Silviculture at the Albert-Ludwigs-Universität Freiburg in the Forest Climate Fund project "Mixed beech-fir forests for the adaptation of commercial forests to extreme climate change events - BuTaKli"

2013 – 2019


Lecturer in the MWK expansion programme "Master 2016" at the Faculty of Environment and Natural Resources at the Albert-Ludwigs-Universität Freiburg



Scientific employee at the Chair of Silviculture at the Albert-Ludwigs-Universität Freiburg in the DFG project "Can the resistance and resilience of trees to drought be increased through thinning to adapt forests to climate change?"



Doctorate at the Faculty of Environment and Natural Resources at the Albert-Ludwigs-Universität Freiburg. Title of dissertation: "Can thinning of conifer stands increase drought tolerance of crop trees?"

2002- 2007 

Master of Science in Forestry at the Albert-Ludwigs-Universität Freiburg. Title of the diploma thesis "Variation in coarse woody debris attributes in Tasmanian tall wet Eucalyptus obliqua (L'Herit.) forests and implications for its monitoring"



Awards and scholarhsips


Göttingen Prize for Forest Ecosystem Research for the dissertation


Doctoral scholarship from the state of Baden-Württemberg


Haury Visiting Scholar Fellowship Award from the Laboratory of Tree-Ring Research at the University of Arizona (USA)


"Hansjürg Steinlin Prize" of the Faculty of Forest and Environmental Sciences for the diploma thesis


"Alumni Award" of the Faculty of Forest and Environmental Sciences for outstanding academic achievements

Publication list

Schnabel, F., Liu, X., Kunz, M., Barry, K. E., Bongers, F. J., Bruelheide, H., Fichtner, A., Härdtle,W., Li, S., Pfaff, C., Schmid, A., Schwarz, J., Tang, Z., Yang, B., Bauhus, J., Oheimb, G., Ma, K., Wirth, C. (2021). Species richness stabilizes productivity via asynchrony and drought-tolerance diversity in a large-scale tree biodiversity experiment. Science advances, 7(51), eabk1643. DOI: 10.1126/sciadv.abk1643 

van der Maaten-Theunissen, M., Trouillier, M., Schwarz, J., Skiadaresis, G., Thurm, E. A., & van der Maaten, E. (2021). pointRes 2.0: New functions to describe tree resilience. Dendrochronologia, 70, 125899.

Tague, C. N., Schwarz, J. A., Hurteau, M. D., & Parolari, A. (Eds.). (2021). Forest Management Alters Forest Water Use and Drought Vulnerability. Frontiers Media SA.

Bottero, A., Forrester, D.I., Cailleret, M., Kohnle, U., Gessler, A., Michel, D., Bose, A.K., Gillerot, J., Hanewinkel, M., Lévesque, M., Ryder, J., Sainte-Marie, J., Schwarz, J., Yousefpour, R., Zamora-Pereira, J., & Rigling, A. (2021). Growth resistance and resilience of mixed silver fir and Norway spruce forests in central Europe: Contrasting responses to mild and severe droughts. Global Change Biology 27 (18), 4403-4419.

Schwarz, J., Schnabel, F., & Bauhus, J. (2021). A conceptual framework and experimental design for analysing the relationship between biodiversity and ecosystem functioning (BEF) in agroforestry systems. Basic and Applied Ecology 55, 133-151

Skiadaresis, G., Schwarz, J., Stahl, K., & Bauhus, J. (2021) Groundwater extraction reduces tree vitality, growth and xylem hydraulic capacity in Quercus robur during and after drought events". Scientific Reports 11 (1), 5149 

Schwarz, J., Skiadaresis, G., Kohler, M., Kunz, J., Schnabel, F., Vitali, V., & Bauhus, J. (2020). Quantifying Growth Responses of Trees to Drought—a Critique of Commonly Used Resilience Indices and Recommendations for Future Studies. Current Forestry Reports, 6, 185-200.

Erfurt, M., Skiadaresis, G., Tijdeman, E., Blauhut, V., Bauhus, J., Glaser, R., Schwarz, J., Tegel, W., & Stahl, K. (2020). Exploring the added value of a long-term multidisciplinary dataset in drought research–a drought catalogue for southwestern Germany dating back to 1801. Nat. Hazards Earth Syst. Sci. Discuss.

Schnabel, F., Schwarz, J. A., Dănescu, A., Fichtner, A., Nock, C. A., Bauhus, J., & Potvin, C. (2019). Drivers of productivity and its temporal stability in a tropical tree diversity experiment. Global change biology, 25(12), 4257-4272.

Schwarz, J. A., & Bauhus, J. (2019). Benefits of mixtures on growth performance of silver fir (Abies alba) and European beech (Fagus sylvatica) increase with tree size without reducing drought tolerance. Frontiers in Forests and Global Change, 2, 79.

Skiadaresis, G., Schwarz, J. A., & Bauhus, J. (2019). Groundwater extraction in floodplain forests reduces radial growth and increases summer drought sensitivity of pedunculate oak trees (Quercus robur L.). Frontiers in Forests and Global Change, 2, 5.

Dănescu, A., Kohnle, U., Bauhus, J., Sohn, J., & Albrecht, A. T. (2018). Stability of tree increment in relation to episodic drought in uneven-structured, mixed stands in southwestern Germany. Forest Ecology and Management, 415: 148-159.

Sohn, J., Saha, S., & Bauhus, J. (2016). Potential of forest thinning to mitigate drought stress: A meta-analysis. Forest Ecology and Management, 380: 261-273.

Sohn, J., Hartig, F., Kohler, M., Huss, J., Bauhus, J. (2016). Heavy and frequent thinning promotes drought adaptation in Pinus sylvestris forests. Ecological Applications 26(7):  2190-2205 . Sohn, J. A., Brooks, J. R., Bauhus, J., Kohler, M., Kolb, T. E., & McDowell, N. G. (2014). Unthinned slow-growing ponderosa pine (Pinus ponderosa) trees contain muted isotopic signals in tree rings as compared to thinned trees. Trees 28(4): 1035-1051.

Sohn, J., Gebhardt, T., Ammer, C., Bauhus, J., Häberle, K.-H., Matyssek, R., Grams, T.E.E. (2013).  Mitigation of drought by thinning: Short-term and long-term effects on growth and physiological performance of Norway spruce (Picea abies). Forest Ecology and Management 308: 188-197.

Sohn, J., McElhinny, C., Grove, S., Hilbig, E., Bauhus, J. (2013). A simplified inventory approach for estimating carbon in coarse woody debris in high-biomass forests. Papers and Proceedings of the Royal Society of Tasmania, Vol. 147, p. 15-23.

Sohn, J., Kohler, M. , Gessler, A. ,  Bauhus, J. (2012): Interactions of thinning and stem height on the drought response of radial stem growth and isotopic composition of Norway spruce (Picea abies). Tree Physiology  32 (10): 1199-213.

Kohler, M., Sohn, J., Nägele, G., Bauhus J (2010) Can drought tolerance of Norway spruce (Picea abies (L.) Karst.) be increased through thinning? European Journal of Forest Research 129 (6): 1109-1118.