Plant ecology studies the interaction between plants and their environment. Ecosystem science considers life processes at the scale of whole communities of plants or even at the whole ecosystem level. Our group links plant level processes (ecophysiology) to ecosystem functioning with a special emphasis on the impact of species identity (biodiversity) on ecosystem level processes.

Carbon dioxide is the key resource for photosynthesis and dry matter production and the photosynthetic rate of C3 plants is not CO2 saturated at today’s concentration of ca. 385 ppm. As the CO2-concentration is rising rapidly and the pre-industrial concentration of ca. 280 ppm will be doubled in ca. 80 years, our group is heavily engaged in research on the consequences of CO2-enrichment for plants under as natural as possible growth conditions. One of our main research projects has been the 'Swiss Canopy Crane Project’, the first trial worldwide of exposing a naturally grown mature forest to a future CO2 concentration. Results show that certain tree species reduce their water consumption under elevated CO2 and the quality of leaf and branch tissue changes, which in turn influences herbivores, including pests. Tree canopy responses are rather rapidly communicated to soil microorganisms.

At community and ecosystem level, biodiversity effects tend to overrun physiological ‘first principle‘ effects. The challenge ahead is the study and understanding of complex interactions of the various units that compose an ecosystem. Our group works in multi-species forests and grassland. Special target areas are alpine vegetation, the climatic high elevation treeline, temperate and tropical forests and grassland types from contrasting climates.

• Flowering phenology in alpine grassland strongly responds to shifts in snowmelt but weakly to summer drought
  Vorkauf, Maria; Kahmen, Ansgar; Korner, Christian; Hiltbrunner, Erika
  Alpine Botany 10.1007/s00035-021-00252-z Published: APR 2021
• Elevation-specific responses of phenology in evergreen oaks from their low-dry to their extreme high-cold range limits in the SE Himalaya (Jan, 10.1007/s00035-020-00245-4, 2021)
  Wang, Song-Wei; He, Xiao-Fang; Chen, Jian-Guo; Sun, Hang; Korner, Christian; et al.
  Alpine Botany 10.1007/s00035-021-00253-y Published: APR 2021
• Rhizosphere 'Trade' Is an Unnecessary Analogy: Response Noe
  Prescott, Cindy E.; Grayston, Sue J.; Helmisaari, Helja-Sisko; Kastovska, Eva; Korner, Christian; et al.
  Trends In Ecology & Evolution, DOI: 10.1016/j.tree.2020.12.005 MAR 2021
• Water relations of "trailing-edge" evergreen oaks in the semi-arid upper Yangtze region, SE Himalaya
  He, Xiao-Fang; Wang, Song-Wei; Sun, Hang; Koerner, Christian; Yang, Yang
  Journal Of Systematics And Evolution,  DOI: 10.1111/jse.12696  FEB 2021
• Elevation-specific responses of phenology in evergreen oaks from their low-dry to their extreme high-cold range limits in the SE Himalaya
  Wang, Song-Wei; He, Xiao-Fang; Chen, Jian-Guo; Sun, Hang; Koerner, Christian; et al.
  Alpine Botany,  DOI: 10.1007/s00035-020-00245-4  JAN 2021
• Explaining the exceptional 4270 m high elevation limit of an evergreen oak in the south-eastern Himalayas
  Yang, Yang; Sun, Hang; Koerner, Christian
  Tree Physiology,  DOI: 10.1093/treephys/tpaa070 OCT 2020
• Surplus Carbon Drives Allocation and Plant-Soil Interactions
  Prescott, Cindy E.; Grayston, Sue J.; Helmisaari, Helja-Sisko; Kastovska, Eva; Korner, Christian; et al.
  Trends In Ecology & Evolution, DOI: 10.1016/j.tree.2020.08.007 DEC 2020
• Integrating the evidence for a terrestrial carbon sink caused by increasing atmospheric CO2
  Walker, Anthony P.; De Kauwe, Martin G.; Bastos, Ana; Belmecheri, Soumaya; Georgiou, Katerina; et al.
  New Phytologist,   DOI: 10.1111/nph.16866  OCT 2020
• Water and nutrient relations of mistletoes at the drought limit of their hosting evergreen oaks in the semiarid upper Yangtze region, SW China
  He, Xiao-Fang; Wang, Song-Wei; Koerner, Christian; Yang, Yang
  Trees-structure And Function,  DOI: 10.1007/s00468-020-02039-x   OCT 2020
• A first assessment of the impact of the extreme 2018 summer drought on Central European forests
  Schuldt B; Buras A; Arend M; Vitasse Y; Beierkuhnlein, C; Damm, A; Gharun, M; Grams, TEE; Hauck, M; Hajek, P; Hartmann, H; Hiltbrunner, E; Hoch, G; Holloway-Phillips, M; Koerner, C; Larysch, E; Lubbe, T; Nelson, DB; Rammig, A; Rigling, A; Rose, L; Ruehr, NK ; Schumann, K; Weiser, F; Werner, C; Wohlgemuth, T; Zang, CS; Kahmen, A
  Basic And Applied Ecology 2020, 10.1016/j.baae.2020.04.003
• Halving sunlight reveals no carbon limitation of aboveground biomass production in alpine grassland
  Moehl, Patrick; Hiltbrunner, Erika; Koerner, Christian
  Global Change Biology, 10.1111/gcb.14949, JAN 2020
• Share the wealth: Trees with greater ectomycorrhizal species overlap share more carbon
  Rog, Ido; Rosenstock, Nicholas P.; Koerner, Christian; Klein, Tamir
  Molecular Ecology, 10.1111/mec.15351, Early Access: JAN 2020
• No need for pipes when the well is dry – a comment on hydraulic failure in trees
  Korner, Christian
  Tree Physiology,  DOI: 10.1093/treephys/tpz030
• A Humboldtian view of mountains
  Korner, C; Spehn, E
  SCIENCE, 365 (6458):1061-1061; SI 10.1126/science.aaz4161 SEP 13 2019
• Data do not support large-scale oligotrophication of terrestrial ecosystems
  Hiltbrunner, E; Korner, C; Meier, R; Braun, S; Kahmen, A
  NATURE ECOLOGY & EVOLUTION, 3 (9):1285-1286; 10.1038/s41559-019-0948-5 SEP 2019
• Limited capacity of tree growth to mitigate the global greenhouse effect under predicted warming
  Buntgen, U; Krusic, PJ; Piermattei, A; Coomes, DA; Esper, J; Myglan, VS; Kirdyanov, AV; Camarero, JJ; Crivellaro, A; Korner, C
  NATURE COMMUNICATIONS, 10 10.1038/s41467-019-10731-x JUN 17 2019
• Twelve years of low nutrient input stimulates growth of trees and dwarf shrubs in the treeline ecotone
  Mohl, P; Morsdorf, MA.; Dawes, MA.; Hagedorn, F; Bebi, P; Viglietti, D ; Freppaz, M; Wipf, S; Korner, C; Thomas, FM; Rixen, C
  JOURNAL OF ECOLOGY, 107 (2):768-780 10.1111/1365-2745.13073 MAR 2019
• …

• Plant Ecophysiology and Systems Ecology
• Population Ecology and Reproductive Biology
• Tropical Ecology
• Biodiversity research
• Forest ecology
• Alpine ecology

• Plant, animal, soil and climatological work
• Human dimensions of global change