(Dept. 1) Ecohydrology and Biogeochemistry

The interactions within and between green water (in terrestrial systems) and blue water (lakes, rivers, and subsurface aquifers) affect in complex ways the habitats for organisms and the reactive transport of abiotic components. Aquatic and terrestrial systems are coupled at multiple spatio-temporal scales. The overall goal of the Department of Ecohydrology and Biogeochemistry is to understand the ecohydrological and biogeochemical processes of these connected land- and waterscapes in natural, rural and urban environments. Therefore, our research projects focus on the following core topics:

  • Interactions of  landscape-freshwater ecosystems
  • Physical and biogeochemical drivers under global change
  • Water security in disturbed and urban systems

In our research, we integrate different modelling approaches with data collected in field studies, in large-scale manipulation studies,  by long-term monitoring and in laboratory experiments. We study ecohydrological and biogeochemical processes using a variety of tracer techniques, particularly stable isotopes, and by measuring naturally dissolved solutes, conservative geogenic ions, trace organic matter, and nutrients. In doing so, we combine basic research with application aspects and aim to record and model the effects of climate and land use changes. With its laboratory infrastructure and expertise in the fields of inorganic and organic analysis as well as isotope measurement, the department performs a central function for the entire institute. To achieve our research goal, we combine our professional expertise from the research disciplines of hydrology, geochemistry, aquatic physics, ecology, environmental engineering, and geography.

Research groups

Georgiy Kirillin
Stephanie Spahr
Alexander Sukhodolov
Dörthe Tetzlaff
Markus Venohr

Department members

Selected publications

July 2025
Water Resources Research. - 61(2025)7, Art. e2025WR040525

Hydrological Connectivity Dominates NO3-N Cycling in Complex Landscapes – Insights From Integration of Isotopes and Water Quality Modeling

Songjun Wu; Doerthe Tetzlaff; Xiaoqiang Yang; Tobias Sauter; Chris Soulsby

The authors integrated isotope-aided with N modelling to quantify the (dis)connection of different flow paths and related biogeochemical transformations, which is important for land and water management. Hydrological connectivity controls N transformations by regulating soil moisture and available NO3-N for processing from upstream inflows. 

June 2025
Hydrology and Earth System Sciences. - 29(2025)12, 2707–2725

Understanding ecohydrology and biodiversity in aquatic nature-based solutions in urban streams and ponds through an integrative multi-tracer approach

Maria Magdalena Warter; Dörthe Tetzlaff; Chris Soulsby; Tobias Goldhammer; Daniel Gebler; Kati Vierikko; Michael T. Monaghan

The authors used stable water isotopes, hydrochemistry and eDNA in a novel, integrated tracer-approach to show how ecohydrological interactions and biodiversity in urban aquaNBS are influenced by urban water sources and connectivity. The direct linkages between hydrology and microbial patterns are highlighted, illustrating the sensitivity of aquaNBS to anthropogenic and climate influences.

June 2025
Water Research. - 284(2025), Art. 123921

Persulfate activation by biochar for trace organic contaminant removal from urban stormwater

Yiling Zhuang; Stefan B. Haderlein; Holger V. Lutze; Chen Sun; Friedrich Fink; Andrea Paul; Stephanie Spahr

We show that biochar can activate peroxydisulfate to eliminate widespread persistent and mobile organic contaminants from urban stormwater. Our laboratory-based investigation provides the basis for future studies towards the practical implementation of biochar and peroxydisulfate for stormwater treatment.

May 2025
Hydrological Processes. - 39(2025)5, Art. e70141

Storage Dynamics and Groundwater–Surface Water Interactions in a Drought Sensitive Lowland Catchment: Process-Based Modelling as a Learning Tool

Zhengtao Ying; Doerthe Tetzlaff; Jean-Christophe Comte; Songjun Wu; Chris Soulsby

The authors simulated seasonal and long-term changes in the spatio-temporal patterns of water storage dynamics and groundwater–surface water interactions in lowland tributary of the Spree catchment. After several major droughts, groundwater stores are depleted and stream flows intermittent. This shows the importance of integrated land and water management in NE Germany.

April 2025
WIREs Water. - 12(2025)2, Art. e70018

The Unexploited Treasures of Hydrological Observations Beyond Streamflow for Catchment Modeling

Paul D. Wagner; Doris Duethmann; Jens Kiesel; Sandra Pool; Markus Hrachowitz; Serena Ceola; Anna Herzog; Tobias Houska; Ralf Loritz; Diana Spieler; Maria Staudinger; Larisa Tarasova; Stephan Thober; Nicola Fohrer; Doerthe Tetzlaff; Thorsten Wagener; Björn Guse

Other hydrological data than streamflow have the potential to improve process consistency in hydrological modeling and consequently for predictions under change. The authors review how storage and flux variables are used for model evaluation and calibration; improving process representation.