EGU22-3742, updated on 27 Mar 2022
https://doi.org/10.5194/egusphere-egu22-3742
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Effects of drought and warming treatments on CO2 fluxes in shrubland ecosystems across European environmental gradients

Qiaoyan Li1, Albert Tietema2, Sabine Reinsch3, Gabriele Guidolotti4, Inger Kappel Schmidt1, Giovanbattista de Dato5, Bridget Emmett3, Eszter Lellei-Kovács6, and Klaus Steenberg Larsen1
Qiaoyan Li et al.
  • 1Geosciences and Natural Resource Management, University of Copenhagen, Denmark (qli@ign.ku.dk)
  • 2Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, The Netherlands
  • 3UK Centre for Ecology & Hydrology, Environment Centre Wales, Bangor, United Kingdom
  • 4Research Institute on Terrestrial Ecosystems (IRET), National Research Council (CNR), Porano (TR), Italy
  • 5CREA Council for Agricultural Research and Economics, Research Centre for Forestry and Wood Arezzo, Italy
  • 6Institute of Ecology and Botany, Centre for Ecological Research, Hungary

Shrubland ecosystems are vulnerable and typical ecosystems across European countries, but now they are facing a range of threats and an uncertain future because of climate change. Within the INCREASE project, six shrubland ecosystems along a geographical and climatic gradient across Europe from Wales and Denmark in the North, over The Netherlands to Hungary and Italy in the South, were exposed to ecosystem-level warming and extended periods of drought using automated curtain technologies. Sites ranged naturally from xeric to hydric. During our measurement period, mean annual precipitation (MAP) was reduced by 8-25%, while mean annual air temperature (MAT) was increased year-round by 0.2 - 0.9 ℃.

Previously, Reinsch et al. (2017) * showed that aboveground net primary production (ANPP) was relatively resilient to the climate treatments while soil respiration (Rs) was reduced in xeric to mesic sites but increased in the hydric site. However, quantification of the gross primary production (GPP) or ecosystem respiration (Reco) rates and their responsiveness to climate manipulations have not previously been published. We will here present data from the six shrubland sites along the European climate gradient of the responses of GPP and Reco to drought and warming expressed as annual relative change (%) from the untreated control along a Gaussen index (GI). Results are in contrast to the previously reported decrease in Rs responsiveness with increased aridity. For both Reco and GPP rates, our preliminary results indicate that the more arid sites have a stronger, negative effect of drought suggesting different response patterns of autotrophic and heterotrophic components of the ecosystems.

*Reinsch, S., Koller, E., Sowerby, A. et al. Shrubland primary production and soil respiration diverge along European climate gradient. Sci Rep 7, 43952 (2017). https://doi.org/10.1038/srep43952

How to cite: Li, Q., Tietema, A., Reinsch, S., Guidolotti, G., Schmidt, I. K., de Dato, G., Emmett, B., Lellei-Kovács, E., and Larsen, K. S.: Effects of drought and warming treatments on CO2 fluxes in shrubland ecosystems across European environmental gradients, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-3742, https://doi.org/10.5194/egusphere-egu22-3742, 2022.

Comments on the display material

to access the discussion