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Isotope Biogeochemistry and Gas Fluxes

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​​​​ Pfeil links Back to the working groups of the research area

The focus of our work is the investigation of key processes that regulate the flux of elements and water within the soil-plant-atmosphere continuum (SPAC) of agricultural landscapes. For this purpose, isotope techniques, methods for measuring gas fluxes and plant physiological studies are combined. The targeted combination of these approaches and their further development within the framework of interdisciplinary and multiscale projects enables the integrative analysis and quantification of element and water fluxes along the SPAC as well as the elucidation of their regulation. Currently, the working group is focusing on the role of erosion for C and N dynamics in agricultural landscapes, on the importance of rhizosphere processes for rhizodeposition and nutirient uptake, and on the water balance and water use efficiency of ecosystems.

 

C and N dynamics in agricultural landscapes 

Erosion causes a steady shift of topsoil particularly on croplands. This results in an increasingly intense, small-scale pattern of terrain positions characterized by strong differences in soil properties. The goal of our studies is to determine how these differences in soil properties affect C and N fluxes and stocks in the soil, as well as the function of these positions as sources and sinks of greenhouse gases. Special emphasis is placed on accurately quantifying the influence of soil heterogeneity and erosion state on fertilizer N dynamics and N use efficiency in the soil-plant system and the fate of assimilates in the soil.

 

Rhizosphere processes 

The root system of plants and the release of carbon compounds into the rhizosphere (root exudation) play a critical role in the uptake of nutrients from the soil. These effects are strongly interlinked with the flow of soil water, as this in turn exerts a strong influence on the distribution of root exudates and the availability of nutrients in the rhizosphere. To date, we have only fragmentary knowledge of the spatiotemporal dynamics of root exudate movement in the rhizosphere and how it interacts with soil water fluxes and root uptake of water and nutrients. Thus, our goal is to elucidate these relationships using isotopic techniques and rhizosphere imaging techniques.

 

Water balance and water use efficiency of ecosystems​ 

Extreme hydrological events, such as droughts, heavy rainfall and floods, are already affecting ecosystem C sequestration and the productivity of agricultural sites. To assess the extent to which impairments will continue to increase as a result of climate change, a much more comprehensive, quantitative, and process-based understanding of water fluxes in the soil-plant-atmosphere continuum along spatiotemporal scales from the individual plant to the landscape level is needed. We aim to contribute to this primarily by closely linking carbon and water budgets. We therefore combine novel high-frequency and automated gas flow and isotope techniques with other methodologies from the spectrum of ecosystem physiology and ecohydrology to gain an improved understanding of dynamic SPAC process feedbacks and their effects on water and carbon budgets and thus the resilience of agricultural and other ecosystems.

 

Core Infrastructure:

Carbon c​rane 

Stable isotope laboratory 

Radionuclide laboratory 

Incubation facilities

 

 

 Publications WG

MyTitle: Modelling intra- and interannual variability of BVOC emissions from maize, oil-seed rape and ryegrass
MyLinkAnsehenUrl: https://doi.org/10.1029/2021MS002683, Take a look
MyLinkPDFUrl: https://publications.zalf.de/publications/6fcd4516-1a49-4b07-ac2b-c56c952b244c.pdf, PDF take a look
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MyAutoren: Havermann, F., Ghirardo, A., Schnitzler, J.-P., Nendel, C., Hoffmann, M., Kraus, D., Grote, R. (2022)
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Modelling intra- and interannual variability of BVOC emissions from maize, oil-seed rape and ryegrass

Havermann, F., Ghirardo, A., Schnitzler, J.-P., Nendel, C., Hoffmann, M., Kraus, D., Grote, R. (2022)
MyTitle: Can the nation-wide COVID-19 lockdown help India identify region-specific strategies for air pollution?
MyLinkAnsehenUrl: https://doi.org/10.1007/s41324-021-00426-1, Take a look
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MyTitelMehrzeilig:
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MyAutoren: Saadat, M. N., Das, S., Nandy, S., Pandey, D., Chakraborty, M., Mina, U., Sarkar, A. (2022)
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Can the nation-wide COVID-19 lockdown help India identify region-specific strategies for air pollution?

Saadat, M. N., Das, S., Nandy, S., Pandey, D., Chakraborty, M., Mina, U., Sarkar, A. (2022)
MyTitle: Reviews and syntheses: gaining insights into evapotranspiration partitioning with novel isotopic monitoring methods
MyLinkAnsehenUrl: https://doi.org/10.5194/bg-18-3701-2021, Resolve DOI name
MyLinkPDFUrl: https://publications.zalf.de/publications/a9bb0045-ace1-46c4-b01f-f535e743c634.pdf, PDF take a look
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MyAutoren: Rothfuss, Y., Quade, M., Brüggemann, N., Graf, A., Vereecken, H., Dubbert, M. (2021)
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Reviews and syntheses: gaining insights into evapotranspiration partitioning with novel isotopic monitoring methods

Rothfuss, Y., Quade, M., Brüggemann, N., Graf, A., Vereecken, H., Dubbert, M. (2021)
MyTitle: Erosion effects on soil carbon and nitrogen dynamics on cultivated slopes: a meta-analysis
MyLinkAnsehenUrl: https://doi.org/10.1016/j.geoderma.2021.115045, Resolve DOI name
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MyAutoren: Holz, M., Augustin, J. (2021)
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Erosion effects on soil carbon and nitrogen dynamics on cultivated slopes: a meta-analysis

Holz, M., Augustin, J. (2021)
MyTitle: A novel robotic chamber system allowing to accurately and precisely determining spatio-temporal CO2 flux dynamics of heterogeneous croplands.
MyLinkAnsehenUrl: https://doi.org/10.1016/j.agrformet.2020.108206, Resolve DOI name
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MyAutoren: Vaidya, S., Schmidt, M., Rakowski, P., Bonk, N., Verch, G., Augustin, J., Sommer, M., Hoffmann, M. (2021)
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A novel robotic chamber system allowing to accurately and precisely determining spatio-temporal CO2 flux dynamics of heterogeneous croplands.

Vaidya, S., Schmidt, M., Rakowski, P., Bonk, N., Verch, G., Augustin, J., Sommer, M., Hoffmann, M. (2021)

 Projects WG

MyTitle: AID-CROP - Amorphous silica in soils and plants Improves Drought stress tolerance of crops
MyLinkAnsehenUrl: https://www.zalf.de/en/forschung_lehre/projekte/Pages/details.aspx?iddp=2273, Take a look
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MyTitelMehrzeilig:
MyTextfeld: Start: 01.03.2022
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AID-CROP - Amorphous silica in soils and plants Improves Drought stress tolerance of crops

Start: 01.03.2022
MyTitle: Rhizosphere functions in plant water uptake: Mechanistic link between carbon and water fluxes in the plant-soil system
MyLinkAnsehenUrl: https://www.zalf.de/en/forschung_lehre/projekte/Pages/details.aspx?iddp=2275, Take a look
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MyTitelMehrzeilig:
MyTextfeld: Start: 01.01.2022
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Rhizosphere functions in plant water uptake: Mechanistic link between carbon and water fluxes in the plant-soil system

Start: 01.01.2022
MyTitle: PotenzioN - Potentials to increase nutrient efficiency and to reduce nitrogen emissions in starch potatoes
MyLinkAnsehenUrl: https://www.zalf.de/en/forschung_lehre/projekte/Pages/details.aspx?iddp=2232, Take a look
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MyTitelMehrzeilig:
MyTextfeld: Start: 01.11.2021
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PotenzioN - Potentials to increase nutrient efficiency and to reduce nitrogen emissions in starch potatoes

Start: 01.11.2021
MyTitle: VESBO - Impact assessment of Vascular plant Encroachment on water and carbon cycling in a Sphagnum dominated bog
MyLinkAnsehenUrl: https://www.zalf.de/en/forschung_lehre/projekte/Pages/details.aspx?iddp=2224, Take a look
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MyTitelMehrzeilig:
MyTextfeld: Start: 01.05.2021
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VESBO - Impact assessment of Vascular plant Encroachment on water and carbon cycling in a Sphagnum dominated bog

Start: 01.05.2021
MyTitle: Win-N - Reduction of nitrogen emissions by improving nutrient efficiency Sub-project: Raw material crop cultivation and measurement of gaseous N-losses at the on-farm experiment Dedelow and during incubation experiments (N2) (Win-N)
MyLinkAnsehenUrl: https://www.zalf.de/en/forschung_lehre/projekte/Pages/details.aspx?iddp=2208, Take a look
MyLinkPDFUrl:
MyTitelMehrzeilig:
MyTextfeld: Start: 01.03.2021
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Win-N - Reduction of nitrogen emissions by improving nutrient efficiency Sub-project: Raw material crop cultivation and measurement of gaseous N-losses at the on-farm experiment Dedelow and during incubation experiments (N2) (Win-N)

Start: 01.03.2021

 

  

Contact

 

Head of working group

Prof. Dr. Jürgen Augustin
T +49 (0)33432 82-376

 

Address

Leibniz-Zentrum für
Agrarlandschaftsforschung (ZALF) e. V.

Eberswalder Straße 84
15374 Müncheberg

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