EGU21-14527
https://doi.org/10.5194/egusphere-egu21-14527
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Examining the vulnerability of Australian eucalypts to future drought-induced tree mortality

Martin De Kauwe1, Manon Sabot1, Andrew Pitman1, Sami Rifai1, Patrick Meir, Lucas Cernusak3, Belinda Medlyn4, and Anna Ukkola1
Martin De Kauwe et al.
  • 1ARC Centre of Excellence for Climate Extremes, Climate Change Research Centre, Sydney, University of New South Wales, Australia (mdekauwe@gmail.com)
  • 3College of Science and Engineering, James Cook University, Cairns, Qld, Australia (lucas.cernusak@jcu.edu.au)
  • 4Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia (B.Medlyn@westernsydney.edu.au)

Australia is the driest inhabited continent. Annual rainfall is low and is accompanied by marked inter-annual variability, leading to multi-year droughts. Climate change is expected to alter the frequency, magnitude, and intensity of future droughts, with potentially major environmental and socio-economic consequences for Australia. However, Australian vegetation is well adapted to extended dry periods, thus, the likelihood of drought-induced mortality in the future depends both on the severity of future drought events and inherent vegetation resilience. Here, we used the Community Atmosphere Biosphere Land Exchange (CABLE) land surface model, coupled with a stomatal optimisation scheme, to examine the projected impact of future drought for 24 Eucalyptus species. We forced CABLE with future climate from four global climate models (MIROC, ECHAM, CCCMA, and CSIRO) dynamically downscaled by three regional climate models. We separated the impact of climate change (e.g. increasing VPD, precipitation variability) from rising CO2 (increasing water use-efficiency) to provide the first assessment of future drought risk to Australian trees.

How to cite: De Kauwe, M., Sabot, M., Pitman, A., Rifai, S., Meir, P., Cernusak, L., Medlyn, B., and Ukkola, A.: Examining the vulnerability of Australian eucalypts to future drought-induced tree mortality, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14527, https://doi.org/10.5194/egusphere-egu21-14527, 2021.

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