Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 12, issue 4
Biogeosciences, 12, 961-975, 2015
https://doi.org/10.5194/bg-12-961-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 12, 961-975, 2015
https://doi.org/10.5194/bg-12-961-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 17 Feb 2015

Research article | 17 Feb 2015

Drought in forest understory ecosystems – a novel rainfall reduction experiment

K. F. Gimbel1, K. Felsmann2, M. Baudis3, H. Puhlmann5, A. Gessler2,6,7, H. Bruelheide3,4, Z. Kayler2, R. H. Ellerbrock2, A. Ulrich2, E. Welk3,4, and M. Weiler1 K. F. Gimbel et al.
  • 1Chair of Hydrology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany
  • 2Institute for Landscape Biogeochemistry, Leibniz Center for Agricultural Landscape Research e.V. (ZALF), Leipniz, Germany
  • 3Institute of Biology, Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Germany
  • 4German Centre for Integrative Biodiversity Research (iDiv) Leipzig, Germany
  • 5Forest Research Institute Baden-Württemberg, Freiburg, Germany
  • 6Research Unit Forest dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research WSL, Zürchestr. 111, 8903 Birmensdorf, Switzerland
  • 7Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany

Abstract. Precipitation patterns across Central Europe are expected to change over the 21st century due to climate change. This may reduce water availability during the plant-growing season and hence affect the performance and vitality of forest ecosystems. We established a novel rainfall reduction experiment on nine sites in Germany to investigate drought effects on soil–forest–understory ecosystems. A realistic, but extreme annual drought with a return period of 40 years, which corresponds to the 2.5% percentile of the annual precipitation, was imposed. At all sites, we were able to reach the target values of rainfall reduction, while other important ecosystem variables like air temperature, humidity, and soil temperature remained unaffected due to the novel design of a flexible roof. The first year of drought showed considerable changes in the soil moisture dynamics relative to the control sites, which affected leaf stomatal conductance of understory species as well as evapotranspiration rates of the forest understory.

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This paper introduces a novel rainfall reduction experiment to investigate drought effects on soil-forest-understory-ecosystems. An annual drought with a return period of 40 years was imposed, while other ecosystem variables (humidity, air & soil temperature) remained unaffected. The first year of drought showed considerable changes in soil moisture dynamics, which affected leaf stomatal conductance of understory species as well as evapotranspiration rates of the forest understory ecosystem.
This paper introduces a novel rainfall reduction experiment to investigate drought effects on...
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