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An increasing number of scientists and disciplines around the world are benefiting from the application of stable water isotope techniques (2H and 18O) –, especially in ecohydrology. Stable isotope analysis of soil pore water is generally performed to investigate water flow paths through the unsaturated zone. For this reason, several water extraction methods for stable isotope analysis exist. A critical issue, however, is that we know little about which soil water extraction method captures which soil water pool (mobile to tightly bounded water) and how well mixed these soil water pools are. Early experiments with soil columns revealed the existence of a weakly bound, easily exchangeable soil water pool, which is isotopically different from mobile soil water.
In this study, we would like to test the following hypotheses:
Figure 1. Hypothesis visualized in dual isotope space (adapted from Araguás-Araguás et al., 1995).
Against this background, the potential candidate would:
The student/s should be interested in conducting field and lab work and be familiar with statistical software, such as R or Python.
Preliminary data of test runs with three different soil types is already existing!
Natalie Orlowski, University of Freiburg, Tel. +49761 203 9283, email@example.com
Matthias Sprenger, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Spain, firstname.lastname@example.org