EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Analysis of floodplain forest sensitivity to drought

Natalia Kowalska1, Ladislav Šigut1, Marko Stojanović2, Milan Fischer1,3, Ina Kyselova1, and Marian Pavelka1
Natalia Kowalska et al.
  • 1Global Change Research Institute Czech Academy of Science - CAS, Department of Matter and Energy Fluxes, Brno, Czech Republic (
  • 2Global Change Research Institute Czech Academy of Science - CAS, Department of Xylogenesis and Biomass Allocation, Brno, Czech Republic
  • 3Department of Agrosystems and Bioclimatology, Faculty of Agronomy, Mendel University in Brno, Zemědělská 1, 61300 Brno, Czech Republic

Floodplain forests are very complex, productive ecosystems, capable of storing huge amounts of soil carbon. With the increasing occurrence of extreme events, they are today among the most threatened ecosystems. Our study’s main goal was to assess the productivity of a floodplain forest located at Lanžhot in the Czech Republic from two perspectives: carbon uptake (using an eddy covariance method) and stem radius variations (using dendrometers). We aimed to determine which conditions allow for high ecosystem production and what role drought plays in reducing such production potential. Additionally, we were interested to determine the relative soil water content threshold indicating the onset and duration of this event. We hypothesized that summer drought in 2018 had the most significant negative effects on the overall annual carbon and water budgets. In contrast with our original hypothesis, we found that an exceptionally warm spring in 2018 caused a positive gross primary production (GPP) and evapotranspiration (ET) anomaly that consequently led in 2018 to the highest seasonal total GPP and ET from all of the investigated years (2015–2018). The results showed ring-porous species to be the most drought resistant. Relative soil water content threshold of approximately 0.45 was determined as indicating the onset of drought stress.

How to cite: Kowalska, N., Šigut, L., Stojanović, M., Fischer, M., Kyselova, I., and Pavelka, M.: Analysis of floodplain forest sensitivity to drought, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-711,, 2021.


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