Unterschiede
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Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
thesis:plant_available_soil_water_pools [2020/02/26 14:39] – norlowski | thesis:plant_available_soil_water_pools [2020/10/15 11:57] (aktuell) – norlowski | ||
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==== Intercomparison of plant water extraction methods for isotope analysis ==== | ==== Intercomparison of plant water extraction methods for isotope analysis ==== | ||
- | == Problemstellung | + | == Background |
An increasing number of scientists and disciplines around the world are benefitting from the application of stable water isotope techniques (δ2H and δ18O), especially in plant ecology and ecohydrology. Investigations of ecohydrological processes using such techniques have improved our understanding of soil water dynamics (1) and patterns of plant water use (2). In this regard, the analysis of the isotopic composition of xylem water has been applied to determine the source of water used by plants under the assumption that there is no fractionation during the uptake process by roots and water transportation (3). The basis of this approach is that the potential water sources available to plants (i.e. groundwater, | An increasing number of scientists and disciplines around the world are benefitting from the application of stable water isotope techniques (δ2H and δ18O), especially in plant ecology and ecohydrology. Investigations of ecohydrological processes using such techniques have improved our understanding of soil water dynamics (1) and patterns of plant water use (2). In this regard, the analysis of the isotopic composition of xylem water has been applied to determine the source of water used by plants under the assumption that there is no fractionation during the uptake process by roots and water transportation (3). The basis of this approach is that the potential water sources available to plants (i.e. groundwater, | ||
- | == Ziel der Arbeit | + | == Aim == |
In this study, we will compare different isotopic sampling techniques in plant and soil that involves in situ measurements of δ2H, δ18O, δ17O and different destructive water extraction techniques (e.g. centrifugation, | In this study, we will compare different isotopic sampling techniques in plant and soil that involves in situ measurements of δ2H, δ18O, δ17O and different destructive water extraction techniques (e.g. centrifugation, | ||
{{ : | {{ : | ||
+ | Fig. 1: Experimental setup including ecohydrological and isotopic measurement equipment. | ||
Against this background, the potential candidate would: | Against this background, the potential candidate would: | ||
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- | == Herausforderungen | + | == Challenges |
The student/s should be interested in conducting field and lab work and be familiar with statistical software, such as R or Python. | The student/s should be interested in conducting field and lab work and be familiar with statistical software, such as R or Python. | ||
- | == Betreuung/Kontakt | + | == Supervision/Contact |
Natalie Orlowski: natalie.orlowski@hydrology.uni-freiburg.de; | Natalie Orlowski: natalie.orlowski@hydrology.uni-freiburg.de; | ||
This project is in collaboration with Magali Nehemy (Global Institute for Water Security, Saskatoon, CA) and Paula Martín-Gómez (INRA Bordeaux, FR). | This project is in collaboration with Magali Nehemy (Global Institute for Water Security, Saskatoon, CA) and Paula Martín-Gómez (INRA Bordeaux, FR). | ||
- | == Sprache | + | == Language |
English | English | ||
- | == Literatur | + | == Literature |
- Sprenger M, Seeger S, Blume T, Weiler M. Travel times in the vadose zone: Variability in space and time. Water Resour Res. 52(8): | - Sprenger M, Seeger S, Blume T, Weiler M. Travel times in the vadose zone: Variability in space and time. Water Resour Res. 52(8): | ||
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