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Faculty for Biology, Chemistry, and Earth Sciences

Junior Professorship Agroecology - Prof. Dr. Johanna Pausch

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Johanna Pausch: Theses supervised



Bachelor's Theses
Timo Hubmann A comparison of different methods for extracting and measuring the carbon isotopic composition of arbuscular mycorrhizal fungi more

Supervisor: Saskia Klink, Johanna Pausch
Sebastian Floßmann Rhizodeposition and N2O emissions through denitrification: Comparison of Zea mays and Silphium perfoliatum more

Supervisor: Johanna Pausch, Pauline Rummel
Maximilian Horsch Silicon-induced effects on leaf and root traits of rice under drought

Supervisor: Johanna Pausch, Jörg Schaller
Laura Hofmann Root traits as drivers of soil CO2 efflux: Investigations based on continuous 13C-isotope measurements using cavity ring-down spectroscopy.

Experimental setup



Supervisor: Johanna Pausch
Andrea Gößwein (2019) Dynamics of microbial biomass and net nitrification in arable soils: Comparison of the cup plant (Silphium perfoliatum) with maize (Zea mays)

Supervisor: Johanna Pausch, Reinhard Wesinger (GeoTeam)
Carina Wenisch (2019) Carbon costs for P uptake via cluster roots of white lupine (Lupinus albus) more

Supervisor: Johanna Pausch
Jonas Hahn (2019) Root morphology and nitrogen uptake of the cup plant (Silphium perfoliatum) compared to maize (Zea mays)

Supervisor: Johanna Pausch, Reinhard Wesinger (GeoTeam)


Master's Theses
Lukas Gerber Influence of silicon addition on phosphorus uptake and biomass of spring wheat

Supervisor: Jörg Schaller, Johanna Pausch
Cara Meyer Mechanisms of carbon and nutrient exchange between plants and their arbuscular or ectomycorrhizal fungal partner

Supervisor: Saskia Klink, Johanna Pausch
Jana Kuhla Effect of Si accumulation on drought tolerance of rice

Ziel des Experiments ist die Untersuchung der Effekte von Trockenstress auf Reispflanzen mit aktivem und defektem Si-Transporter unter Si-Düngung. Ermittelt werden neben Photosyntheseleistung und stomatärer Leitfähigkeit auch die Spross- und Wurzelbiomasse sowie die Wurzelmorphologie. Außerdem wird durch 13C-Labeling die Kohlenstoffverlagerung innerhalb der Pflanze untersucht. Aufgrund bisheriger Veröffentlichungen wird erwartet, dass ein höherer Si-Gehalt einen positiven Einfluss auf die Trockentoleranz der Pflanzen haben könnte.

 

 



Supervisor: Johanna Pausch, Jörg Schaller
Kiely Doherty Effects of Climate Change on Root Production in European (Sub)Alpine Grasslands more

Supervisor: Johanna Pausch, Yue Sun, Anke Jentsch
Stefanie Breunig The temperature dependence of soil organic matter decomposition through mycorrhizal fungi: A field study more

Supervisor: Yue Sun, Johanna Pausch
Ramona Krauß Temporal dynamics of CO2 and N2O emissions from arable soils with the cup plant (Silphium perfoliatum) compared to maize (Zea mays) more

Supervisor: Johanna Pausch, Gerhard Gebauer, Reinhard Wesinger (GeoTeam)


PhD Theses
Manal Dafallah How mucilage maintains microbial decomposition processes in soils under drought

Litter decomposition is a central process in carbon and nutrients cycling in soils. For my PhD, I have designed a set of experiments to investigate the combined effects of soil water content (optimum moisture and drought) and mucilage addition on litter decomposition. Mucilage, a gel that has the remarkable ability to swell and absorb water, is mainly produced at the root tips. It is primarily composed of neutral and acid polysaccharides, proteins and small amounts of phenolic acids and phospholipids. We hypothesis that mucilage can compensate for the detrimental effects of drought and thus promote soil microorganisms. Drought can be buffered (to a certain extent) by mucilage maintaining the microbial functions in soil hotspots such as the rhizosphere. Using isotope approaches and innovative laser techniques (cavity-ring-down-spectroscopy), I am studying the effect of mucilage on litter decomposition under decreasing water availability.

 
     

Set up for incubation experiments (CO2-Isotope-Analyzer, Los Gatos)



Supervisor: Johanna Pausch, Michaela Dippold
Peter Stimmler Modelling the effects of silicone and calcium availability on the sustainability of carbon in Arctic permafrost soils based on laboratory and field experiments

In meiner Promotion erforsche ich den Einfluss von anorganischen Nährstoffen auf die Klimagasfreisetzung aus arktischen Permafrostböden. Die Arktis ist der größte Speicher für organischen Kohlenstoff und erwärmt sich im Klimawandel doppelt so schnell wie der restliche Planet. Die Stoffkreisläufe von Kohlenstoff und Stickstoff werden immer besser verstanden, jedoch gibt es kaum Forschung zu dem Einfluss anderer Minerale. Um die aktivierenden und inhibierenden Effekte von Calcium und amorphen Silizium zu bestimmen, messe ich die Gasproduktion arktischer Böden mit veränderter Mineralkomposition. Um die Elementverfügbarkeiten in der Arktis zu ermitteln untersuche ich insgesamt 700 Böden. Weiterhin untersuche ich den Einfluss von veränderten Elementkonzentrationen auf die mikrobiellen Gemeinschaft und die Oberflächenmodifizierung der Bodenminerale durch amorphes Silicium. Um die Ergebnisse auf das Ökosystem übertragen zu können werde ich eine Vegetationsperiode in NE-Sibirien Gasmessungen durchführen.

Supervisor: Jörg Schaller, Johanna Pausch
Saskia Klink Influence of mycorrhizal types on soil organic matter decomposition

My work deals with the influence of different mycorrhizal associations on the decomposition of soil organic matter (SOM). The majority of plants offers a symbiotic association with mycorrhizal fungi. The plant transfers photosynthetic carbon to its fungal partner in exchange with nutrients like P, N, Cu or Zn from soil. The most common mycorrhizal associations are represented by the arbuscular mycorrhiza (AM) and the ectomycorrhiza (ECM). These do not only differ in their type of association with plant roots, but also in their ability to decompose soil organic matter and in their way to influence nutrient fluxes in soil. In my work, I aim to elucidate the meaning of these differences for temperate habitats.

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Supervisor: Johanna Pausch
Amit Kumar (2018) Plant-microbial interactions in the rhizosphere: root mediated changes in microbial activity and soil organic matter turnover

Supervisor: Johanna Pausch
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