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Heterogeneity of organic carbon pools soils

The current goal of this research field is the qualitative and quantitative investigation of the heterogeneity of organic carbon (OC) pools in soils. A soft physical fractionation of soil is performed separating four soil phases: sediment phase (> 20 µm), microaggregate phase (2-20 µm), colloid phase (< 2 µm) and electrolyte phase. The heterogeneity in the distribution of the organic carbon pools is investigated in these phases (see Fig.).

The main objectives are:

  • Comprehension of the transformation dynamics of the organic carbon pools in the different soil fractions (application of NMR and IR spectroscopy) as well as the investigation of the relation between the amount of organic carbon pools and the surface area and porosity of the soil fraction (application of the gas adsorption technique). The information gained is important for understanding the stabilization of the organic carbon pools and the binding kinetics of nutrients and chemicals in soil aggregates.
  • Characterization of potentially mobile organic carbon (colloid phase and electrolyte phase) and the solution conditions for its release from soils (application of UV, fluorescence and photon correlation spectroscopy, potentiometry and microelectrophoresis). The information gained is important for understanding the mobility of nutrients and chemicals strongly bound to organic carbon.

 

Contact:

Dr. Jean-Marie Sequaris
Tel.    :  ++49 2461 61 6751
E-mail:   j.m.sequaris@fz-juelich.de


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