TP1-2: Evapotranspiration

The influence of agroforestry on evaporation and transpiration

Summary

As part of the SIGNAL-BonaRes consortium, the Bioclimatology group of the University of Goettingen investigates water vapour and energy fluxes in agroforestry systems. Agroforestry systems have potential for improving the use of water, light, and nutrient resources while preserving or enhancing essential properties of agricultural systems. This includes sustainable management of fertile soils and limiting soil erosion. We will assess the impact of introducing trees into agricultural systems on water vapour and energy fluxes, radiation, wind field and microclimate. Ten meteorological and turbulence measurement towers will be deployed across Germany. We will use the eddy-covariance surface-energy-budget method to quantify evapotranspiration in agroforestry and conventional agriculture. We will apply soil-vegetation-atmosphere transfer (SVAT) and Large-Eddy Simulation (LES) models to upscale meteorological drivers, energy fluxes and the wind field from local measurements to field scale. Finally, our findings from measurements and modelling will be compiled as a tool for practitioners and stakeholders, enabling to plan optimized crop layout and to evaluate potential benefits of agroforestry systems over conventional agriculture.

Our objectives are:

  • To assess evaporation and transpiration rates of different agroforestry systems (mixed system includes strips of fast growing trees) at ecosystem level and quantify how they differ relative to the conventional agriculture.
  • To assess evaporation and transpiration rates specifically for tree and agricultural crop components.
  • To quantify by measurements and modelling relevant meteorological drivers of water fluxes at high temporal and spatial resolution.
  • To assess the interaction (competition, facilitation) of trees and agricultural crops in the combined agroforestry system in terms of water and light resources.

 

Contact

Prof. Dr. Alexander Knohl

University of Göttingen, Bioclimatology
Büsgenweg 2, 37077 Göttingen, Germany

Phone: +49 (0)551 39 33683
Fax: +49 (0)551 39 9619
Email: aknohl@uni-goettingen.de

Dr. Lukas Siebicke

University of Göttingen, Bioclimatology
Büsgenweg 2, 37077 Göttingen, Germany

Phone: +49 (0)551 39 8100
Fax: +49 (0)551 39 9619
Email: Lukas.Siebicke@forst.uni-goettingen.de