Abschlussarbeiten

Die Arbeitsgruppe Geomorphologie und Bodenkunde bietet spannende Themen im Bereich biogeochemischer Prozesse in Ökosystemen der gemäßigten Breiten und der Tropen.

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Global effects of individual behaviour in the land sector (M.Sc.)

Human land use has had substantial impacts around the world, profoundly altering natural systems and processes. Feedbacks in the forms of climatic change and ecosystem collapse are likely to pose serious challenges for humanity in the future, and the land sector will need to adapt if it is to continue supplying essential goods and services. While these changes and their consequences are global in nature, underlying decisions about land management are made by individuals, communities and societies at far smaller scales. This project will involve a meta-analysis of existing evidence about the effects of these small-scale decisions, to uncover the behavioural factors that are important in shaping global-scale land use change. This will feed into improved modelling of the land system under future climate change and policy interventions. For further information contact Calum Brown (calum brownXfb7∂kit edu) or Mark Rounsevell (mark rounsevellXyw8∂kit edu).

Feedbacks between land use and ecosystem service provision (M.Sc.)

Human land use provides a wide range of ecosystem services, but with many negative consequences and trade-offs. Given the need to feed a growing human population, it is essential to understand how well particular land uses provide particular services, and to what extent they prevent the provision of others. This project will examine the evidence for links and feedbacks between land uses and ecosystem services to allow better modelling and planning of land use change. Existing assessments will be reviewed alongside primary evidence of land use impacts on natural systems, and these will be used to improve model-based representations of land system development. For further information contact Calum Brown (calum brownTss8∂kit edu).

Improving the representation of European land use change in agent-based models (M.Sc.)

Human land use has had substantial impacts around the world, profoundly altering natural systems and processes. Feedbacks in the forms of climatic change and ecosystem collapse are likely to pose serious challenges for humanity in the future, and the land sector will need to adapt if it is to continue supplying essential goods and services. Agent-based models allow us to explore how people’s responses to environmental change shape future land use, and are now being applied at European scale. This project will develop an existing agent-based model of European land use change (CRAFTY-EU) to improve its representation of land use processes and consequences. Primary data on land use types and impacts will be combined with reviewed information of land management decision-making to allow modelling with finer resolution than is currently possible, giving new insight into the future of the European land system. There is also an option of developing a version of CRAFTY for Germany. For further information contact Calum Brown (calum brownPwe4∂kit edu) or Mark Rounsevell (mark rounsevellIbg7∂kit edu).

Modelling climate adaptation in patterns of production and consumption (M.Sc.)

Adaptation to climate change is necessary for the continued production of the goods and services that people require. However, such adaptation can be difficult and disruptive, and tends to occur slowly if at all. One reason for this is that adaptation decisions depend upon individual characteristics and social influences that take time to develop. Building on insights from adaptation psychology and a simple agent-based model of adaptive decision-making in production and consumption sectors (coded in NetLogo), this project will explore the ways in which generic adaptation can develop, spread, and ensure sustainable provision of goods and services under climate change. For further information contact Calum Brown (calum brownJzz2∂kit edu).

Evaluating the performance of past land use change scenarios (M.Sc.)

The scenario method is used extensively in environmental change assessments, including in the development of alternative projections of land use change. One of the earlier such studies (Ewert et al., 2005; Rounsevell et al., 2005; Rounsevell et al, 2006) used the year 2000 as a baseline and projected European land use change (EU15 at the time) for time slices to the end of the 21st Century. This means that we now have nearly 20 years of observed land use change time series against which to evaluate the performance of these early scenarios. An evaluation is useful in that it provides insights into how land use change models performed, but also to better understand how the drivers of land use change played out in practice. This study will evaluate the performance of these earlier land use change scenarios against the actual land use change since the year 2000, as well as exploring whether the assumptions about the trends in critical land use change drivers (economy, population, social preferences, technology, …) were correct. Contact: Prof. Mark Rounsevell (mark rounsevellOlj1∂kit edu)

References

Ewert, F., Rounsevell, M.D.A., Reginster, I., Metzger, M. and Leemans, R. (2005). Future scenarios of European agricultural land use. I: Estimating changes in crop productivity. Agriculture, Ecosystems and Environment, 107, 101-116

Rounsevell, M.D.A. Ewert, F. Reginster, I., Leemans, R. and Carter, T.R. (2005). Future scenarios of European agricultural land use. II: projecting changes in cropland and grassland. Agriculture, Ecosystems and Environment, 107, 117-135

Rounsevell, M.D.A, Reginster, I., Araújo, M.B., Carter, T.R., Dendoncker, N., Ewert, F., House, J.I., Kankaanpää, S., Leemans, R., Metzger, M.J., Schmit, C., Smith, P. and Tuck, G. (2006). A coherent set of future land use change scenarios for Europe. Agriculture, Ecosystems and Environment, 114, 57-

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Evaluierung einer Methode zur Anpassung der Energiebilanzschließung auf verschiedenen Zeitskalen

Bei diesem Thema geht es darum die Methode von De Roo et al. (2018) für unsere Messstationen im TERENO-Voralpen-Observatorium anzuwenden und die Sensitivität gegenüber dem Mittelungsinterval zu untersuchen. Als unabhängige Referenz für die Evapotranspiration dienen die Lysimeter-Daten aus der Studie von Mauder et al. (2018). Kontakt: M. Mauder

Spektrale Korrektur der turbulenten Dämpfung bei Wind-Lidar-Daten

Bei diesem Thema sollen die beiden Korrekturverfahren nach Puccioni et al. (2020) und Brugger et al. (2016) für die spektrale Dämpfung von Wind-Lidar-Daten in einen R- oder Python-Code umgesetzt werden. Die Ergebnisse sollen mit einander verglichen werden. Als unabhängige Referenz dienen Windmessungen mit einem Ultraschallanemometer an einem Meteorologischen Turm. Kontakt: M. Mauder

Analyse von atmosphärischen Transportprozessen über einer Stadt mit Hilfe von Ensemble-gemittelten Large-Eddy-Simulationen (M.Sc.)

Theoretische Konzepte zum Austausch von Energie und Luftbeimengungen zwischen der Landoberfläche und der Atmosphäre gehen in der Regel von einer räumlich homogenen Unterlage aus. Aufgrund der ausgeprägten räumlichen Heterogenität einer Stadt durch die Bebauung kann man über solchen urbanen Systemen nicht davon ausgehen, dass diese Annahme erfüllt ist. Die aus der Heterogenität entstehenden Sekundärzirkulationen sollen mit Hilfe von Ensemble-gemittelten Large-Eddy-Simulationen extrahiert werden. Die Simulationsergebnisse für das Modellgebiet in Berlin liegen bereits vor und sind mit Hilfe eines zu erstellenden Auswerte-Skriptes (R/Python) zu analysieren. Kontakt: M. Mauder

Vergleich der Bodenatmung in einem städtischen und einem ländlichen Ökosystem (ab 2022, M.Sc.)

Bei diesem Thema sollen Messungen der Bodenatmung an zwei Standorten miteinander verglichen werden, zum einen an dem ICOS-Standort Fendt im TERENO-Voralpen-Observatorium, und zum anderen an einem weiteren noch zu etablierenden Standort in München. Dazu sollen die CO2-Emissionen regelmäßig mit einem automatisierten Messsystem mit einer Messkammer von 20 cm Durchmesser gemessen werden (LiCor-8100A Infrarotgasanalysator, LiCor Inc., Lincoln, NE). Kontakt: M. Mauder

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Explore climate change or land-use change impacts on ecosystem functioning (such as carbon, nitrogen, water cycles, biome distribution, crop yields...) globally or regionally. Work includes analysis of model simulations using the dynamic global vegetation model LPJ-GUESS for different future scenarios. Work could also include to perform simple simulations by the student for individual locations. The exact question and related analysis will be discussed with the student.

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Wildfire damages (M.Sc.)

The risk for wildfires is expected to increase under climate change and to spread into new areas. As a consequences, damages from wildfire might also increase, as well as costs for fire management. The thesis would be based on 1) a systematic literature review of (recent) past economic and non-economic damages of large wildfires and 2) use the results from the literature review for e.g., a meta-analysis and/or to extract relationships between damages and other societal measures (e.g. combining statistical data and GIS-based analyses).

Building a forest emulator model (M.Sc.)

For someone with knowledge in machine-learning tools — Forestry is an important factor in climate change: for carbon storage, for providing building materials or for using wood as bioenergy source. But forestry is at the moment not yet well represented in models of land-use change, even though forest-owner decision making on which of these forest uses they prefer will impact forest management greatly.   We seek to represent forestry better in the LandSyMM model (Alexander et al., GCB, 2018,10.1111/gcb.14110), which combines natural constraints on vegetation growth with socio-economic supply and demand. To do so we aim to build a forest-growth emulator which allows to rapidly project forest growth per modelled-gridcell in response to climate change and atmospheric CO2; this emulator can then be efficiently coupled within LandSyMM.

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Note: Students should be present at IMK-IFU during most of the thesis work to facilitate regular exchange. We can pay a small HiWi contract that helps to cover local accommodation costs. Theses can be written in German or English.

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Abschlussarbeiten in der Arbeitsgruppe Umweltmineralogie

Umweltmineralogie und Umweltsystemanalyse Mögliche Abschlussarbeiten können in den Bereichen Bodenmineralogie, Aerosolforschung, Hydrochemie, Urbaner Geochemie, Stadtökologie und Mikroklimatologie angefertigt werden. Themenangebote gibt es auf der Homepage der Arbeitsgruppe Umweltmineralogie und Umweltsystemanalyse.   Stefan Norra

Themenbereiche

Fuel mapping and wildfire simulations for central European forests; vegetation dynamics on the Tibetan Plateau; forest decline in the Zagros forests, Iran (F. Faßnacht)

Phenological timerseries (F. Hogewind)

Savanna dynamics, invasive alien species (J. Kalwij)

Greening and browning of indigenous forests in New Zealand (S. Schmidtlein).

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Bachelor

Veränderung von Ökosystemdienstleistungen von Stadtbäumen in Karlsruhe und Pfinztal

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Deep Learning im Wald

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Master

Analyse von Blatt N:P-Verhältnissen zur Bewertung von aktuellen und historischen Nährelementlimitierungen (M.Sc.)

Oft wird Stickstoff als das limitierende Element für Pflanzenwachstum bezeichnet. Erhöhte Stickstoffeinträge führen zu einer Erhöhung seiner Verfügbarkeit in Relation zu Phosphor. Es ist daher wahrscheinlich, dass einige Lebensräume, die früher als N-limitiert galten, mittlerweile P-limitiert sind. Es soll hier geklärt werden, in welchem Zusammenhang das Blatt N:P-Verhältnisse zu Bodennährstoffgehalten steht, ob das Pflanzenwachstum in den untersuchten Lebensräumen N- oder P-limitiert ist und wie sich Blatt N:P-Verhältnisse in aktuellen Blattproben von historischen Proben unterscheiden. Dieser Arbeit umfasst u.a. die Durchführung von chemischen Blattaufschlüssen und die Analyse der P-Gehalte in Zusammenarbeit mit der Arbeitsgruppe Geomorphologie und Bodenkunde (Bastian Bayer). Möglicher Beginn: ab Februar 2021. Kontakt: M. Ewald.

Species mapping using a drone (M.Sc.)

The aim of this project is to test if automatic species recognition from consumer-grade RGB aerial imagery can be used in a savanna ecosystem. Specifically, the student will map all the LELE plots (1 ha each; N = 48). Fieldwork is planned for the entire month of March 2021. High-resolution RGB imagery will be captured with a drone. Extensive ground truthing data will be collected for CNN training. The output of this project will serve as baseline for annual monitoring of the impact of mega-herbivores on tree dynamics. Contact: J.M. Kalwij, F. Schiefer.

Impact of mega-herbivore fences on herbivory distribution (M.Sc.)

Mega-herbivore fences are designed to prevent elephants from accessing a protected area. Due to the physical design of such fences — an electrified cable at a height of 1.8 m — giraffes are also excluded. Other herbivores are assumed to be unaffected by such fences. The aim of this project is to test the assumption that mega-herbivore fences block access for mega-herbivores only, while non-targeted herbivores remain unaffected. To test this hypothesis, the student will conduct a herbivore presence survey of the LELE plots (1 ha each; N = 48). Species-specific herbivore abundance will be primarily determined from pellets. In addition, animals tracks, data from GPS collars, and camera traps may be used too. Fieldwork is planned for the entire month of March 2021. The output of this project will serve as a foundation to quantify the effectiveness of the LELE exclosure plots. Contact: J.M. Kalwij.

Dynamics and mechanisms of secondary forests in tropical forests (M. Sc.)

Deforestation has led to overwhelming reduction of old-growth tropical forests. In the Amazon forests alone, an area of approximately two times the size of Germany (~760,550 km²) has been deforested since the 1970's. Meanwhile, secondary succession that regrow on abandoned deforested or agricultural lands increased in extent. Natural regrowth through secondary succession, i.e., the regrowth after nearly complete removal of forest cover for agricultural use, is of paramount importance for disturbed areas to recover, as well as, an important factor of the resilience of tropical forests. The rapid rate of carbon sequestration through regeneration can reach up to 11 times the carbon uptake rate of old-growth forests. The aim of this project is to assess the dynamics and trajectories of secondary forests over tropical ecosystems and evaluate the environmental conditions and anthropogenic disturbance post recovery to support conservation on forest regrowth. We will use multi-temporal and high-spatial resolution airborne LiDAR data to quantify structural and changes and associated carbon dynamics over a large patch of secondary forests in eastern Amazon, Brazil. Contact: Y. Mendes, F. Faßnacht.

Darüber hinaus können auch extern vergebene Arbeiten zu Themen der Umwelt-Naturwissenschaften angefertigt werden (zu den Regeln mehr hier). Die folgende Übersicht soll es leichter machen, am Institut für Geographie und Geoökologie Dozenten zu finden, die als Prüfer für solche externen Arbeiten zur Verfügung stehen. Die Zusammenstellung ist nicht vollständig.

Botanik: Arneth, Damm, Egger, Kalwij, Schmidtlein, Wittmann

Fernerkundung: Fassnacht, Schmidtlein

Meteorolgie: Mauder, Norra

Zoologie: Schmidtlein, Wittmann