A5013345808- Soil Carbon and Nitrogen Dynamics
- Ion-surface interactions and analysis
- Iron oxide chemistry and applications
- Microbial Community Ecology and Physiology
- Soil and Water Nutrient Dynamics
- Clay minerals and soil interactions
- Geology and Paleoclimatology Research
- Soil Geostatistics and Mapping
- Geochemistry and Elemental Analysis
- Geochemistry and Geologic Mapping
- Analytical chemistry methods development
- Pleistocene-Era Hominins and Archaeology
- Soil and Unsaturated Flow
- Image Processing and 3D Reconstruction
- Nuclear Materials and Properties
- Mass Spectrometry Techniques and Applications
- Fusion materials and technologies
- Heavy metals in environment
- X-ray Spectroscopy and Fluorescence Analysis
- Mineral Processing and Grinding
- Geophysical and Geoelectrical Methods
- CO2 Sequestration and Geologic Interactions
- Mine drainage and remediation techniques
- Geological and Geophysical Studies Worldwide
- Metabolomics and Mass Spectrometry Studies
Technical University of Munich
2016-2025
ORCID
2021
Weihenstephan-Triesdorf University of Applied Sciences
2015-2020
Max Planck Society
2011-2015
Max Planck Institute for Plasma Physics
2009-2015
Abstract The largest terrestrial organic carbon pool, in soils, is regulated by an intricate connection between plant inputs, microbial activity, and the soil matrix. This manifested how microorganisms, key players transforming plant-derived into carbon, are controlled physical arrangement of inorganic particles. Here we conduct incubation isotopically labelled litter to study effects structure on fate litter-derived matter. While activity fungal growth enhanced coarser-textured soil, show...
The sequestration of carbon and nitrogen by clay-sized particles in soils is well established, clay content or mineral surface area has been used to estimate the potential soils. Here, via incubation a sieved (<2 mm) topsoil with labelled litter, we find that only some surfaces bind organic matter (OM). Surprisingly, <19% visible areas show an OM attachment. preferentially associated organo-mineral clusters rough surfaces. By combining nano-scale secondary ion mass spectrometry isotopic...
Abstract Correlations between organic carbon (OC) and fine mineral particles corroborate the important role of abundance soil minerals with reactive surfaces to bind increase persistence matter (OM). The storage OM broadly consists particulate mineral-associated forms. Correlative studies on impact mostly combined data from differing sites potentially confounded by other environmental factors. Here, we analyzed in a clay content gradient 5–37% similar farm management composition. Throughout...
Calcium (Ca) can contribute to soil organic carbon (SOC) persistence by mediating physico-chemical interactions between compounds and minerals. Yet, Ca is also crucial for microbial adhesion, potentially affecting colonization of plant mineral surfaces. The importance as a mediator microbe-mineral-organic matter resulting SOC transformation has been largely overlooked. We incubated 44Ca labeled soils with 13C15N leaf litter study how affects formation associated matter. Here we show that...
Plant roots are major transmitters of atmospheric carbon into soil. The rhizosphere, the soil volume around living influenced by root activities, represents hotspots for organic inputs, microbial activity, and turnover. Rhizosphere processes remain poorly understood observation key mechanisms transfer protection in intact rhizosphere microenvironments challenging. We deciphered fate photosynthesis-derived (OC) wheat combining stable isotope labeling at field scale with high-resolution...
Extracellular polymeric substances (EPS) are expected to be an important source for the formation of mineral-organic associations in soil. Because such formations affect composition mobile and immobile organic matter as well reactivity minerals, we investigated EPS before after adsorption goethite. Raman measurements on extracted from Bacillus subtilis distinguished four fractions rich proteins, polysaccharides, lipids, or lipids proteins. Scanning transmission X-ray microscopy identified...
Recombinant human erythropoietin (EPO) improves cognitive performance in neuropsychiatric diseases ranging from schizophrenia and multiple sclerosis to major depression bipolar disease. This consistent EPO effect on cognition is independent of its role hematopoiesis. The cellular mechanisms action brain, however, have remained unclear. Here we studied healthy young mice observed that 3-week administration was associated with an increased number pyramidal neurons oligodendrocytes the...
Abstract Secondary ion mass spectrometry (SIMS) is generally used in imaging the isotopic composition of various materials. It becoming increasingly popular biology, especially for investigations cellular metabolism. However, individual proteins are difficult to identify SIMS, which limits ability this technology study compartments or protein complexes. We present a method s pecific and fluorescence labeling (SPILL), based on novel click reaction with probes. Using method, we added 19...
The physical, chemical, and biological processes forming the backbone of important soil functions (e.g., carbon sequestration, nutrient contaminant storage, water transport) take place at reactive interfaces particles pores. accessibility these is determined by spatial arrangement solid mineral organic components, resulting pore system. Despite development application novel imaging techniques operating micrometer even nanometer scale, microstructure soils still considered as a random...
Abstract Rivers regulate the global carbon cycle by transferring particulate organic (POC) from terrestrial landscapes to marine sedimentary basins, but processes controlling amount and composition of fluvially exported POC are poorly understood. We propose that hydrodynamic sorting modify fluxes during fluvial transit. test this hypothesis studying transported along a ∼1,200 km reach Rio Bermejo, Argentina. Nanoscale secondary ion mass spectrometry revealed was either fine,...
Organic compounds exuded by plant roots can form organo-mineral associations through physico-chemical interactions with soil minerals but disrupt existing increasing their microbial decomposition and dissolution. The controls on these opposing processes are poorly understood, as the chemical spatial characteristics of which may explain gain or loss organic matter at root-soil interface termed rhizosphere. By pulse-labeling 13C-carbon dioxide, we found that maize root exudates increased in...
It is crucial to promote soil carbon sequestration while reducing CO2 emissions mitigate climate change. However, the extent of increasing actual storage depends on amount and composition organic matter input, including its fate during decomposition (SOM) formation via microbial transformation. With respect need increase in sustain fertility, it great interest better understand how soils with different content react amendment fresh matter. Here, we incubated three agricultural representing a...
Soils comprise various heterogeneously distributed pools of lithogenic, free organic, occluded, adsorbed, and precipitated phosphorus (P) forms, which differ depending on soil forming factors. Small-scale heterogeneity element distributions recently has received increased attention in science due to its influence functions fertility. We investigated the micro-scale distribution total P different specific binding forms aggregates taken from a high-P clay-rich low-P sandy by combining advanced...
Abstract Dark, that is, nonphototrophic, microbial CO 2 fixation occurs in a large range of soils. However, it is still not known whether dark substantially contributes to the C balance soils and what factors control this process. Therefore, objective study was quantitate temperate forest soils, determine relationship between soil concentration fixation, estimate relative contribution different groups fixation. For purpose, we conducted 13 C‐CO labeling experiment. We found rates were...
Neutrophilic microbial pyrite (FeS2) oxidation coupled to denitrification is thought be an important natural nitrate attenuation pathway in nitrate-contaminated aquifers. However, the poor solubility of raises questions about its bioavailability and mechanisms underlying oxidation. Here, we investigated direct by a neutrophilic chemolithoautotrophic nitrate-reducing Fe(II)-oxidizing culture enriched from pyrite-rich aquifer. We used with abundance (NA) Fe isotopes (NAFe-pyrite) 57Fe-labeled...
Microbial activity drives soil carbon mineralization, while microbial necromass along with other residues contributes to the stable organic pool. Still, precise quantification and characterization of remains methodologically challenging in complex systems, requiring controlled experiments. We have recently presented conceptual framework death pathways soil, where we hypothesized that different agents would lead varying chemical properties necromass, consequences for fate soil.In studies...
High-resolution imaging approaches revealed heterogeneous soil microstructure with latent spatial patterns that are interrelated biogeochemical matter cycles in soils. Previous reports of the patchy distribution organic (OM) at microscale demand for extensive coverage and arrangement OM across mineral surfaces Here, we present a meta-analysis based on nanoscale secondary ion mass spectrometry (NanoSIMS) measurements machine-learning segmentation providing insights into diverse samples. We...
Examining in situ processes the soil rhizosphere requires spatial information on physical and chemical properties under undisturbed conditions. We developed a correlative imaging workflow for targeted sampling of roots their three-dimensional (3D) context assessed imprint root–soil contact zone at micrometer to millimeter scale. Maize (Zea mays) was grown 15N-labeled columns pulse-labeled with 13CO2 visualize distribution carbon inputs nitrogen uptake together redistribution other elements....
Redox-driven biogeochemical cycling of iron plays an integral role in the complex process network ecosystems, such as carbon cycling, fate nutrients and greenhouse gas emissions. We investigate Fe-(hydr)oxide (trans)formation pathways from rhyolitic tephra acidic topsoils South Patagonian Andosols to evaluate ecological relevance terrestrial for this sensitive fjord ecosystem. Using bulk geochemical analyses combined with micrometer-scale-measurements on individual soil aggregates pumice, we...
Understanding the influence of microstructure tungsten on hydrogen transport is crucial for use as first-wall material in fusion reactors. Here, we report results molecular dynamics and transition state studies grain boundaries hydrogen. An exhaustive mapping possible minimum activation energy migration trajectories trace impurity reveals a strongly modified distribution neighborhood together with an altered connectivity matrix. The indicate that polycrystalline may provide important...
Iron (Fe) oxides in soils are strong sorbents for environmentally important compounds like soil organic matter (SOM) or phosphate, while sorption under field conditions is still poorly understood. We installed polyvinyl chloride plastic bars which have been coated either with synthetic Fe manganese (Mn) 30 days a redoximorphic soil. A previous study revealed the formation of newly formed ("natural") along Mn oxide coatings. This enables us to differentiate between occurring onto surfaces...