Max Planck Gesellschaft

Marco Pöhlmann


room: B2.022
phone: +49 3641 576175
fax: +49 3641 577-0

email: mpoehl(at)
MPI for Biogeochemistry
Postbox 10 01 64 - 07701 Jena


ask me about:

  • anything concerning automation processes,
    • e.g. via Campbell, Raspberry, Z-Wave ...
    • e.g. for controlling, logging, monitoring ...

Curriculum Vitae

since 2002 Technician in the Department of Biogeochemical Processes at the MPI for Biogeochemistry for N.Buchmann
since 2004 Technician in the Department of Biogeochemical Processes at the MPI for Biogeochemistry for M.Schrumpf


2003 certified technician specialization in lanscape ecology at the college of Stadtroda
Thesis: "Untersuchung des Zusammenhangs zwischen Biodiversität und Bodenatmung in bewirtschafteten Grünländern"
2000/2003 Interships with

PhD-Thesis Knohl.A "Short-term variations in 13C of ecosystem respiration reveals link between assimilation and respiration in a deciduous forest" (Picture)
PhD-Thesis Kahmen.A "Biodiversity and ecosystem functioning in semi-natural montane grasslands : effects on productivity, nitrogen partitioning and stability"
PhD-Thesis Søe, Astrid R. B "Controlling factors, scaling issues and partitioning of soil respiration" Picture)

Projects (few selected)

  • FORCAST-Forest Carbon-Nitrogen Trajectories
    • FORCAST was aiming to quantify the partial carbon sinks and sources in common European forest ecosystems and the role of belowground processes with respect to Net Ecosystem Exchange (NEE) of CO2 and Net Biome Productivity (NBP). The role of nitrogen deposition and N-availability and the effects of vegetation and soils on ecosystem fluxes were quantified for different sites and forest age classes. The role of soil organisms in soil organic matter decomposition and their influence on forest productivity was investigated in order to obtain values for carbon storage processes in soils.
      • LAI, sample preparation
  • CARBOEUROPE IP (booklet of the project)
    • CarboEurope-IP aims to understand and quantify the present terrestrial carbon balance of Europe and the associated uncertainty at local, regional and continental scale. This means to determine the European carbon balance with its spatial and temporal patterns understand the controlling processes and mechanisms of carbon cycling in European ecosystems and how these are affected by climate change and variability and human management develop an observation system to detect changes in atmospheric CO2 concentrations and ecosystem carbon stocks related to the European commitments under the Kyoto Protocol.
      • soil sampling, -preparation, carbon stock mapping (Kriging), surveying
      • archive samples, GIS-Database, data evaluation

  • BIOLOG "Biodiversität und Globaler Wandel"
    • Rapid loss of biodiversity is one of the main environmental issues that is presently discussed at the global scale. While research documenting the loss of species diversity is starting to be well established, the consequences of species extinctions for ecosystem functioning are poorly understood. The disruption of the global carbon cycle and climate change as a predicted consequence have triggered the question to what extent terrestrial ecosystems are able to mediate increasing atmospheric CO2 concentrations through carbon uptake. While there is no doubt that the identity of organisms that are assimilating and releasing CO2 in an ecosystem is of significant importance, it has not yet been possible to qualify or quantify the importance of biodiversity for the carbon cycle. Soil respiration as the primary path by which plant-fixed-CO2 returns to the atmosphere is recognized as one of the largest fluxes in the global carbon cycle. Consequently, small changes in the magnitude of soil respiration could have a large effect on the concentration of CO2 in the atmosphere. In the presented work we investigate the influence of plant biodiversity on soil respiration in seminatural montane grasslands in central Germany.
      • Soilrespiration measurements, labeling 13C / 15N, soil sampling, preparation and data evaluation
      • developing and set up of dought stress mesurements, designing Ingrowth-Cores
  • Biodiversity Exploratories
    • In the framework of an initiative to advance biodiversity research in Germany, we established three exemplary large-scale and long-term research sites (funded by the German Research Foundation). They are termed Biodiversity Exploratories, in contrast to mainly descriptive observatories. The exploratories sustain the scientific infrastructure to develop the intellectual framework needed to address critical questions about changes in biodiversity and to evaluate the impacts of those changes for ecosystem processes. Thus, in the exploratories biodiversity and ecosystem research will be merged at a large scale and with a long-term perspective. In the first phase 2006-09 the exploratories addressed the relationship between land-use intensity, biodiversity change, and ecosystem functioning for selected taxa. In 2008 the exploratories integrated further contributing projects proposed by the German research community. Thus, the biodiversity exploratories serve as a stimulating research platform for the whole German biodiversity research community.
      • soil sampling, ArcGis mapping, developing and set up of soil respiration measurements
    • Soils play a critical role in the coupled carbon-cycle climate system. However, our scientific understanding of the role of soil biological-physicochemical interactions and of vertical transport for biogeochemical cycles is still limited. Moreover the representation of soil processes in current models operating at global scale is crude compared to vegetation processes like photosynthesis. Hence, the general aim of this project is to improve our understanding of the key interactions between the biological and the physicochemical soil systems that are often not explicitly considered in current experimental and modeling approaches and are likely to influence the biogeochemical cycles for a large part of the terrestrial biosphere and thus have the potential to significantly impact the Earth System as a whole. This will be achieved through an approach that integrates new soil mesocosm experiments, field data from ongoing European projects and soil process modeling. In mesocosm tracer experiments the fate of fresh and autochthonous soil organic matter will be followed under varying temperature and moisture regimes in bacterial and fungal dominated soils and the hypothesis tested that transfer coefficients between soil organic matter pools are constant as implemented in current soil organic matter models. A new soil model structure will be developed that may explicitly account for the role of microbes and transport for soil organic matter dynamics. This will be supported by multiple-constraint model identification techniques, which allows testing and achieving model consistency with several observation types. An incorporation of such new soil module into a global dynamic vegetation model (DGVM) is foreseen.
      • developing and set up of the experimental field setup, Live data preview (CO2, 13C etc.) via Ubuntu-Server, sample preparation, surveying
    • `Tree-grass´ ecosystems. Mixed tree-grass systems are widely distributed (~16-35% of global land-surface) vegetation formations such as tropical and Mediterranean savannas, the “waldsteppe” in Eurasia and culturally influenced vegetation types such as agro-forestry systems or grazed open-forests in Europe (Hanan & Hill 2011). Semi-arid tree-grass systems are considered one of the major contributors to the interannual variability of the global carbon cycle (Poulter et al., 2014). Despite their wide distribution, Earth observation systems, and associated land-surface modeling development have been so far poorly adapted to the key structural and functional characteristics of tree-grass ecosystems. As consequence a significant uncertainty and bias in the assessments of energy, carbon, water and biogeochemical dynamics is often observed (Hanan & Hill 2011; Beringer et al. 2011). Nutrient (N, P) imbalance. Human induced CO2 and N fertilization leads to a stoichiometric imbalance, which confers an important role to P availability and leads to shifts in C-N-P ratios and balances (Peñuelas et al. 2012). N/P imbalances are particularly important in water-limited ecosystems (Sardans et al., 2012), where the synergistic effect of water and nutrient (N and P) availability/imbalance could impact ecosystem functioning, structure, allocation patterns and the nutrient and carbon cycling, and ultimately how the ecosystem will respond to extreme drought events. Hence it is important to study the effects of N and P imbalances under different water regimes, in particular in mixed tree-grass at ecosystem scale. MaNiP project offers an original experimental design integrating cutting-edge approaches to study the combined effect of nutrient and water limiting factors on fundamental ecosystem, plant and soil processes.
      • developing and set up of the automated soilrespirtion measurements
      • programming data evaluation script for soil respiration data
      • soil sampling, sample preparation
    • Nutrient availability plays a pivotal role in the response of terrestrial ecosystems to increasing atmospheric CO2 and climate change. The first generation of global nutrient-carbon cycle models shows strongly diverging estimates of the nutrient effect, resulting from lacking integration of ecosystem observations and fundamental uncertainties in the representation of governing processes. The objective of QUINCY is to clarify the role of the interacting terrestrial nitrogen and phosphorus cycles and their effects on terrestrial C allocation and residence times as well as terrestrial water fluxes. QUINCY will create a novel, predictive framework founded on the principle of resource optimisation, shifting the paradigm of terrestrial biosphere modelling towards an active biological control of matter flows.
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