Natalie Orlowski

Natalie Orlowski
University of Freiburg | Albert-Ludwigs-Universität Freiburg · Institute of Hydrology (IHF)

PhD

About

29
Publications
11,622
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Introduction
Scientific interests: Ecohydrology, stable isotope methods, water extraction methods for soil and plant tissue for stable isotope analysis, soil-plant-water interactions /soil-plant-atmosphere continuum

Publications

Publications (29)
Thesis
Against the background of increasing use of stable water isotopes in hydrogeochemical research sciences, the Institute of Landscape Ecology and Resources Management (ILR) constructed a cryogenic vacuum extraction device. With the principle of cryogenic vacuum extraction, it is possible to determine the isotopic signature of environmental water, mor...
Article
Full-text available
Conducting a dual stable water isotope (δ2H and δ18O) study in the developed landscape of the Schwingbach catchment (Germany) helped to unravel connectivity and disconnectivity between the different water cycle components. The two-year weekly to biweekly measurements of precipitation, stream, and groundwater isotopes revealed that surface and groun...
Article
Full-text available
Knowledge about water flow paths is essential for understanding biogeochemical fluxes in developed agricultural landscapes, i.e., the input of nutrients into surface waters, soil erosion, or pesticide fate. Several methods are available to study rainfall-runoff processes and flux partitioning: hydrometric based approaches, chemical tracers, modelin...
Article
Full-text available
Cryogenic water extraction is the most widely used method to facilitate the laboratory removal of soil pore water for isotopic analysis. However, recent studies have suggested that cryogenic extraction conditions (extraction time, temperature, vacuum threshold) and physicochemical soil properties can influence extracted water isotopic signatures. H...
Article
Full-text available
Measurements of δ2H and δ18O composition of pore waters in saturated and unsaturated soil samples are routinely performed in hydrological studies. A variety of in-situ and lab-based pore water extraction methods for the analysis of the stable isotopes of water now exist. While some have been used for decades (e.g. cryogenic vacuum extraction) other...
Preprint
The ecohydrological separation (EHS) paradigm, frequently compared with the translatory flow (HH), opens up a new understanding of terrestrial water cycles. Recent finding of cryogenic vacuum extraction (CVE) bias and associated correction no longer supports the EHS but goes back to HH. However, we found systematic similarities in plant and soil wa...
Preprint
The ecohydrological separation (EHS) paradigm, frequently compared with the translatory flow (HH), opens up a new understanding of terrestrial water cycles. Recent finding of cryogenic vacuum extraction (CVE) bias and associated correction no longer supports the EHS but goes back to HH. However, we found systematic similarities in plant and soil wa...
Conference Paper
Full-text available
The ecological impacts of climate change encompass significant consequences on the interactions of soil-plant-atmosphere-continuum and flux dynamics and will thus affect forest ecosystems. Much work needs to be done to understand the distribution of ecosystem specific flow pathways and the characteristic timescales of water movement. Understanding...
Article
Full-text available
Tree water uptake processes and ecohydrological travel times have gained more attention in recent ecohydrological studies. In situ measurement techniques for stable water isotopes offer great potential to investigate these processes but have not been applied much to tree xylem and soils so far. Here, we used in situ probes for stable water isotope...
Article
Full-text available
As demand for regional and organically produced foodstuff has increased in Europe, the need has arisen to verify the products’ origin and production method. For food authenticity tracking (production method and origin), we examined 286 samples of wheat (Triticum aestivum), potatoes (Solanum tuberosum), and apples (Malus domestica) from different re...
Article
Understanding P uptake in soil–plant systems requires suitable P tracers. The stable oxygen isotope ratio in phosphate (expressed as δ18OP) is an alternative to radioactive labelling, but the degree to which plants preserve the δ18OP value of the P source is unclear. We hypothesised that the source signal will be preserved in roots rather than shoo...
Preprint
Full-text available
Recent advances in in situ measurement techniques for stable water isotopes offer new opportunities to improve the understanding of tree water uptake processes and ecohydrological travel times. In our semi-controlled experiment with 20-year-old trees of three different species (Pinus pinea, Alnus incana and Quercus suber) placed in large pots, we a...
Article
Full-text available
Soil water stable isotopes are widely used across disciplines (e.g., hydrology, ecology, soil science, and biogeochemistry). However, the full potential of stables isotopes as a tool for characterizing the origin, flow path, transport processes and residence times of water in different eco‐, hydro‐, and geological compartments has not yet been expl...
Article
Full-text available
Ecohydrological isotope based field research is often constrained by a lack of temporally explicit soil water data, usually related to the choice of destructive sampling in the field and subsequent analysis in the laboratory. New techniques based on gas permeable membranes allow to sample soil water vapor in situ and infer soil liquid water isotopi...
Article
Full-text available
Soil water stable isotopes are widely used across disciplines (e.g., hydrology, ecology, soil science, and biogeochemistry). However, the full potential of stables isotopes as a tool for characterizing the origin, flow path, transport processes and residence times of water in different eco‐, hydro‐, and geological compartments has not yet been expl...
Article
Full-text available
The time that water takes to travel through the terrestrial hydrological cycle and the critical zone is of great interest in Earth system sciences with broad implications for water quality and quantity. Most water age studies to date have focused on individual compartments (or sub-disciplines) of the hydrological cycle such as the unsaturated or sa...
Article
Full-text available
Intercomparison of soil pore water extraction methods for stable isotope analysis has been a focus of recent studies in relation to plant source waters, which found a wide isotopic variance depending on the extraction method. Few studies have yet explored extraction effects for mobile pore waters that relate to hillslope runoff. This is because it...
Poster
In this study, we installed a prior tested sampling technique based on polypropylene tubing that enables continuous in situ monitoring of the isotopic composition of soil pore water vapor in a grassland in Southern Germany. We set up rainout shelters to induce water limited conditions and applied two artificial isotopically labeled rain pulses, eac...
Presentation
Full-text available
The time water takes to travel through the hydrological cycle is of great interest in earth system sciences because water travel times reflect how water flows through landscapes, with implications for water quality and quantity. To date, most water age studies have focused on the individual compartments of the water cycle such as the unsaturated an...
Article
Full-text available
link full-text view-only version - https://rdcu.be/QQTc Aim Understanding the source water utilization of ricebased cropping systems helps develop improving water management strategies for paddy management. We investigated the effects of altered flooding regimes and crop diversification on plant root water uptake on a fully-replicated field trial...
Article
Full-text available
For more than two decades, research groups in hydrology, ecology, soil science, and biogeochemistry have performed cryogenic water extractions (CWEs) for the analysis of δ²H and δ¹⁸O of soil water. Recent studies have shown that extraction conditions (time, temperature, and vacuum) along with physicochemical soil properties may affect extracted soi...
Conference Paper
Full-text available
Technical developments in recent years have fostered the application of stable water isotopes to measure, understand and predict water flow paths and different pools of subsurface water. Here we set up an outdoor mini-hillslope experiment to study mixing and runoff processes by means of stable water isotopes. To gain the isotopic information preser...
Article
Full-text available
For more than two decades, research groups in hydrology, ecology, soil science and biogeochemistry have performed cryogenic water extractions for the analysis of δ²H and δ¹⁸O of soil water. Recent studies have shown that extraction conditions (time, temperature, and vacuum) along with physicochemical soil properties may affect extracted soil water...
Article
Stable isotopes of water (²H and ¹⁸O) are useful tracers for determining root water uptake depths. In such studies, plant and soil water are extracted most commonly by cryogenic vacuum distillation. However, recent studies have suggested that cryogenic extraction conditions (extraction time, temperature, and vacuum) and soil physicochemical propert...
Conference Paper
Understanding hydrological processes and flow paths is of major importance for the management of catchment water resources. The power of stable isotopes as a tracer and to encoder environmental information provides the opportunity to assess hydrological flow paths, catchment residence times, landscape influences, and the origin of water resources i...
Article
Full-text available
A dual stable water isotope (λ²H and λ¹⁸O) study was conducted in the developed (managed) landscape of the Schwingbach catchment (Germany). The 2-year weekly to biweekly measurements of precipitation, stream, and groundwater isotopes revealed that surface and groundwater are isotopically disconnected from the annual precipitation cycle but showed b...
Article
Full-text available
This paper addresses education and communication in hydrology and geosciences. Many approaches can be used, such as the well-known seminars, modelling exercises and practical field work but out-door learning in our discipline is a must, and this paper focuses on the recent development of a new out-door learning tool at the landscape scale. To facil...
Article
Full-text available
Stable isotopic analysis of water in plant, soil, and hydrological studies often requires the extraction of water from plant or soil samples. Cryogenic vacuum extraction is one of the most widely used and accurate extraction methods to obtain such water samples. Here, we present a new design of a cryogenic vacuum extraction system with 18 extractio...

Projects

Projects (4)
Project
The central aim of our project is to quantify temporal dynamics of water flow at the soil-plant interface and the associated flow paths through the ecohydrological cycle.
Project
The central aim of our project is to quantify temporal dynamics at the soil-tree interface and how they influence flow paths through the ecohydrological cycle, by means of stable water isotopy. Our central hypothesis is that species identity and water competition between tree species are major drivers for ecohydrological soil-tree feedback processes.