A5080488252- Soil Carbon and Nitrogen Dynamics
- Microbial Community Ecology and Physiology
- Peatlands and Wetlands Ecology
- Soil and Unsaturated Flow
- Legume Nitrogen Fixing Symbiosis
- Plant responses to elevated CO2
- Climate change and permafrost
- Soil and Water Nutrient Dynamics
- Soil Geostatistics and Mapping
- Forest ecology and management
- Plant nutrient uptake and metabolism
- Soil erosion and sediment transport
- Atmospheric and Environmental Gas Dynamics
- Conservation, Biodiversity, and Resource Management
- Polar Research and Ecology
- thermodynamics and calorimetric analyses
- Microbial Fuel Cells and Bioremediation
- Hydrocarbon exploration and reservoir analysis
- Wastewater Treatment and Nitrogen Removal
- Clay minerals and soil interactions
- Hydrology and Sediment Transport Processes
- Earth Systems and Cosmic Evolution
- Rice Cultivation and Yield Improvement
- Anaerobic Digestion and Biogas Production
- Plant Water Relations and Carbon Dynamics
Karlsruhe Institute of Technology
2006-2025
University of Cologne
2022-2024
Cluster of Excellence on Plant Sciences
2024
University of Hohenheim
2013-2023
Institute of Physical-Chemical and Biological Problems in Soil Science
2011-2021
Instituto de Ciencias Agrarias
2019
Russian Academy of Sciences
1992-2014
University of Bayreuth
2008-2011
University of Aberdeen
2010-2011
Institute of Soil Science
1992
The increasing input of anthropogenically derived nitrogen (N) to ecosystems raises a crucial question: how does available N modify the decomposer community and thus affects mineralization soil organic matter (SOM). Moreover, modifies priming effect (PE), that is, fresh organics on microbial decomposition SOM. We studied interactive effects C SOM (by natural (13) labelling adding C4 -sucrose or -maize straw C3 -soil) in relation growth kinetics activities five hydrolytic enzymes. This...
Input of labile carbon may accelerate the decomposition existing soil organic matter (priming effect), with priming intensity depending on changes in nitrogen availability after permafrost thaw. However, experimental evidence for linkage between effect and post-thaw is unavailable. Here we test hypothesis that elevated collapse inhibits by increasing microbial metabolic efficiency based a combination thermokarst-induced natural gradient addition experiment. We find negative correlation total...
Plant-microbial interactions alter C and N balance in the rhizosphere affect microbial carbon use efficiency (CUE)–the fundamental characteristic of metabolism. Estimation CUE hotspots with high dynamics activity changes physiological state from dormancy to is a challenge soil microbiology. We analyzed respiratory activity, DNA content by manipulation nutrients availability under Beta vulgaris. All measurements were done root-free steady-state conditions during growth induced addition...
Summary The most modern molecular approaches fail to link structure of soil microbial community with its functions. We used classical physiological based on (i) growth kinetics and (ii) affinity the substrate show shift in functional properties after amendments substrates contrasting availability. Kinetic parameters substrate‐induced respiration availability were monitored during maize, decomposition glucose or maize straw. Input small amounts easily available (i.e. root exudates)...
Abstract Increased belowground carbon (C) transfer by plant roots at elevated CO 2 may change properties of the microbial community in rhizosphere. Previous investigations that focused on total soil organic C or showed contrasting results: small increase, decrease no changes. We evaluated effect 5 years (550 ppm) four extracellular enzymes: β ‐glucosidase, chitinase, phosphatase, and sulfatase. expected microorganisms to be differently localized aggregates various sizes and, therefore...
Abstract Increasing the belowground translocation of assimilated carbon by plants grown under elevated CO 2 can cause a shift in structure and activity microbial community responsible for turnover organic matter soil. We investigated long‐term effect atmosphere on biomass specific growth rates root‐free rhizosphere The experiments were conducted two free air dioxide enrichment (FACE) systems: Hohenheim Braunschweig, as well intensively managed forest mesocosm Biosphere Laboratory (B2L)...
Abstract Short-term acceleration of soil organic matter decomposition by increasing temperature conflicts with the thermal adaptation observed in long-term studies. Here we used altitudinal gradient on Mt. Kilimanjaro to demonstrate mechanisms extra- and intracellular enzymes that hydrolyze cellulose, chitin phytate oxidize monomers ( 14 C-glucose) warm- cold-climate soils. We revealed no response rate occurs because a cancelling effect consisting an increase half-saturation constants (K m...
Abstract Petroleum pollution of soils is a major environmental problem. Soil microorganisms can decompose significant fraction petroleum hydrocarbons in soil at low concentrations (1–5%). This characteristic be used for remediation after oil pollution. Microbial community dynamics and functions are well studied cases moderate pollution, while with heavy have received much less attention. We bacterial fungal successions three different high contents (6 25%) laboratory experiment. The...
Aims: To study the effect of pH, temperature and substrate on magnitude N2O NO production by heterotrophic nitrifiers. Methods Results: The change in nitrifiers Alcaligenes faecalis subsp. parafaecalis Paracoccus pantotrophus because variations was studied chemostat cultures under steady‐state conditions. N2O, CO2 increased with between 4 32°C. For an optimum 28°C observed. No found for NO. Highest productions were observed at a pH 7·0. However, besides having 7·0, especially but also...
Increased root exudation under elevated atmospheric CO 2 and the contrasting environments in soil macro- microaggregates could affect microbial growth strategies. We investigated effect of on contribution fast- ( r -strategists) slow-growing K microorganisms microaggregates. fractionated bulk from ambient (for 5 years) treatments FACE-Hohenheim (Stuttgart) into large (>2 mm), small (0.25–2.00 (<0.25 mm) using ‘optimal moist’ sieving. Microbial biomass (C mic ), maximum specific rate (μ),...
Abstract Essential soil functions such as plant productivity, C storage, nutrient cycling and the storage purification of water all depend on biological processes. Given this insight, it is remarkable that in modeling these functions, various actors usually do not play an explicit role. In review perspective paper we analyze state art how processes could more adequately be accounted for. We for six different biologically driven clusters are key understanding namely i) turnover organic...