Terrestrial Ecohydrology

Forest vegetation. Source: Kleidon-Hildebrandt/UFZ

Research Focus

We work at the interface between vegetation and the hydrosystem and focus on the vertical connection between soil and atmosphere. We work on both flow directions up and down. We investigate canopy and soil processes and are specifically interested into how vegetation interacts with and creates spatial heterogeneity of fluxes and soil water states.

In our work group we focus on:

  • Pattern formation by canopies and root water uptage and effect on surface flux partitioning
  • Vegetation adaptation to water stress
  • Integrated modelling of vegetation and the water cycle


Group Members

Prof. Dr. Anke
Hildebrandt
Bahar
Bahrami
Sven
Westermann
Dr. Friedrich
Bohn

Projects

For general information on the projects, please click on the links below each logo which will lead you to the project websites.

For short descriptions of our work in the projects, please open boxes  here .

Short Project Descriptions

Root water uptake in anthropogenic change

Installation day NetNet Plots located near the GCEF.

Root water uptake can adapt quickly to changing environmental conditions. For example, ecosystems shift uptake downwards, when water is scarce. Here we investigste, how this capacity of the ecosystems depends on the management, changing climate conditions and especially the availability of other resouces that are also acquired by the root systems, like nitrogen. In this PhD project, we use soil moisture information in the Global Change Experimental Facility and in the Nutrient Network, with the aim to improve representation of plant resource acquisition in models.

A Parsimonious Canopy Model (PCM)

Temperate forest ecosystems play a crucial role in governing global carbon and water cycles. The total carbon uptake of ecosystems by photosynthesis (GPP) is the largest flux between the land and the atmosphere within the carbon cycle. It is intrinsically linked to the canopy leaf production and potentially strongly affected by drought. For the water cycle, leaf area index (LAI) plays a crucial role, as it affects both the interception of rainwater and the water loss during carbon uptake. Therefore, a prognostic simulated vegetation leaf area index (LAI) would substantially improve representation of the water cycle components in hydrological models (e.g., evapotranspiration), while GPP predictions would benefit from simulated soil water storage. Those two key variables can be estimated together by incorporating a light use efficiency concept into a hydrological model. But existing LUE-modules either require external (e.g. satellite-based) LAI dynamics which are subjected to uncertainty and/or the level of the model complexity (when LAI is also simulated) prohibits their integration into hydrologic models. In this project, we develop a parsimonious forest canopy model to simulate the daily development of both GPP and LAI, while ensuring adequate level of complexity to allow coupling into hydrological models.

Preprint of the model description: Bahrami et al., GMD



Cooperations


Teaching

The group contributes to teaching at the Institute of Geoscience at the Friedrich Schiller University of Jena:

  • Preparatory class in Mathematics for incoming students of the BSc Geosciences (3-5 day block course)
  • Module Ecohydrology for the BSc Biogeosciences (3rd year)
  • Lecture Geostatistics for MSc Environmental and Georesources Management, Geosciences and Biogeosciences

Publications