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1 - 10 of 47 publications
  • Department:(Dept. 1) Ecohydrology and Biogeochemistry
April 2022
Hydrology and Earth System Sciences. - 26(2022)9, 2073–2092

Xylem water in riparian Willow trees (Salix alba) reveals shallow sources of root water uptake by in-situ monitoring of stable water isotopes

Jessica Landgraf; Dörthe Tetzlaff; Maren Dubbert; David Dubbert; Aaron Smith; Chris Soulsby

The authors monitored stable isotopes in-situ at high resolution in soil and plant water at an urban green space to understand the ecohydrological functioning of the Critical Zone, i.e., the thin, dynamic, life-sustaining skin of the Earth that extends from the canopy top to the active groundwater. At the end of the growing season deeper than upper soil water was used for plant water uptake.

 

April 2022
Limnology and Oceanography. - 67(2022)4, 768-783

Geochemical focusing and burial of sedimentary iron, manganese, and phosphorus during lake eutrophication

Grzegorz Scholtysik; Tobias Goldhammer; Helge W. Arz; Matthias Moros; Ralf Littke; Michael Hupfer

From the distribution of manganese, iron and phosphorus within sediment cores from 11 water depths of Lake Arendsee, changes in the trophic state and oxygen conditions could be reconstructed. The redox-controlled geochemical focussing induced authigenic vivianite formation under oligo-mesotrophic conditions about 100 years ago, resulting locally in strongly increased burial phosphorus deposition.

April 2022
Water Resources Research. - 58(2022)4, Art. e2021WR030635

Spatial variability of radon production rates in an alluvial aquifer affects travel time estimates of groundwater originating from a losing stream

Jonas L. Schaper; Christiane Zarfl; Karin Meinikmann; Eddie W. Banks; Sandra Baron; Olaf A. Cirpka; Joerg Lewandowski

Radon in surface water is mostly used to localise and quantify groundwater discharge. The study presents the opposite approach and use radon to estimate travel times of infiltrated surface water in the aquifer. The spatial heterogeneity of radon production rates complicates this approach, but the problems can be overcome by additionally considering temperature and hydraulic heads.

March 2022
Hydrological Processes. - 36(2022)3, Art. e14532

Estimates of water partitioning in complex urban landscapes with isotope-aided ecohydrological modelling

Mikael Gillefalk; Doerthe Tetzlaff; Christian Marx; Aaron Smith; Fred Meier; Reinhard Hinkelmann; Chris Soulsby

The authors used isotopes in an ecohydrological model to estimate evapotranspiration (ET) from the landscape of Berlin. This resolved components of ET and quantified transpiration, soil evaporation and evaporation of vegetation-intercepted water. Transpiration from tree-covered areas dominates; with ~80% of ET for urban cooling coming from woodland green spaces covering ~25% of the urban area.

February 2022
Geophysical Research Letters. - 49(2022)4, Art. e2021GL096833

Functional multi-scale integration of agricultural nitrogen-budgets into catchment water quality modeling

Xiaoqiang Yang; Michael Rode; Seifeddine Jomaa; Ines Merbach; Doerthe Tetzlaff; Chris Soulsby; Dietrich Borchardt

Using field-experimental data, crop N uptake responses to fertilizer management were parsimoniously conceptualized and integrated into a catchment diffuse-N model. The improved catchment modeling further facilitated integration with agricultural budget-based assessments.

February 2022
Biogeochemistry. - 157(2022), 355–378

Divergent roles of iron and aluminum in sediment organic matter association at the terrestrial–aquatic interface

Kai Nils Nitzsche; Zachary E. Kayler; Katrin Premke; Arthur Gessler; Rota Wagai

The authors hypothesized that the variation in sediment redox and pH regime govern how iron (Fe) a.aluminum (Al) interact with organic matter (OM) in near-surface mineral sediments.The reactive monomeric Al preferably binds with organic ligands from less-decomposed OM under acidic and anoxic conditions. Low-crystallinity Fe formed under oxic conditions binds with more microbially-processed OM.

February 2022
Hydrological Processes. - 36(2022)2, Art. e14460

Visualizing catchment-scale spatio-temporal dynamics of storage-flux-age interactions using a tracer-aided ecohydrological model

Aaron Smith; Doerthe Tetzlaff; Marco Maneta; Chris Soulsby

The authors used a tracer-aided ecohydrological model to quantify changes in water flux, storage, and age to improve understanding of spatial differences in catchment response through wet and dry cycles. The visualization tool revealed interannual changes in catchment-scale vegetation water usage and water ages and independent effects on individual species and responses / resilience to droughts.

February 2022
Water Resources Research. - 58(2022)1, Art. e2021WR031272

Seasonal differences in the attenuation of polar trace organics in the hyporheic zone of an urban stream

Birgit M. Mueller; Hanna Schulz; Anja Höhne; Anke Putschew; Joerg Lewandowski

The authors investigated the attenuation of trace organic compounds (TrOCs) at a river influenced by treated wastewater during a sampling campaign in summer and one in winter. Contrary to their expectations, they found higher attenuation for 12 out of 18 TrOCs in winter, while three TrOCs were better attenuated in summer. Sediment conditions varied between seasons.

February 2022
Water Resources Research. - 58(2022)2, Art. e2021WR030566

Disentangling the influence of landscape characteristics, hydroclimatic variability and land management on surface water NO3-N dynamics: spatially distributed modeling over 30 yr in a lowland mixed land use catchment

Songjun Wu; Doerthe Tetzlaff; Xiaoqiang Yang; Chris Soulsby

Our ability to quantify nitrate (NO3-N) fluxes and export at the catchment scale remain limited. The authors used long-term (30 yrs) NO3-N data in a mixed land-use, lowland catchment to investigate the long-term dynamics of hydrological and NO3-N fluxes, and key controlling factors. Landscape characteristics, hydroclimatic variability, and management practices were the dominant drivers for NO3-N.

December 2021
Journal of Hydrology. - 600(2021), Art. 126685

Spatio-temporal variations in stable isotopes in peri-urban catchments: a preliminary assessment of potential and challenges in assessing streamflow sources

Lena-Marie Kuhlemann; Doerthe Tetzlaff; Chris Soulsby

The authors used isotope tracers and water quality measurements, hydrometric and climatic data to investigate seasonal changes in water sources in the River Erpe. Downstream, flows were dominated by effluent from a large wastewater treatment plant, especially in summer. They gained new insights into how lowland, peri-urban catchments with complex land use function hydrologically.

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