Carbon and Nitrogen Dynamics

Head: Dr. habil. Uwe Franko


Julius Diel, Eric Bönecke (guest), Nadia Prays (guest)

Technical Staff

Sylvia Schmögner, Ralf Gründling

Stoffkreislauf im System Pflanze-Boden

Main research emphasis is given to soil specific matter fluxes and turnover processes at local and regional scale related to the impact of soil organic matter on important soil functions and ecosystem services using modelling as a tool to develop a better system understanding. Central problem is the interaction between soil structure and the carbon cycle in agro-ecosystems and the impacts caused by climate change and land use. Models developed in the group are CANDY, CIPS and CCB. The modelling is based on the results of an intensive monitoring experiment and the long term experiments in Bad Lauchstädt as well as on the international co-operation with other groups.

modelling carbon dynamics in arable soils: mainly based on long term observations of carbon dynamics the impact of site conditions and management on soil organic matter is modelled in order to predict effects on soil functions and ecosystem services

impact of soil tillage to soil functions: based on selected experimental results the effect of different soil tillage systems on turnover conditions and matter cycling is studied in order to find effective modelling approaches

regionalisation of turnover processes: comparative studys on different soil map scales will provide solutions for an improved model parametrisation procedure

current reasearch activities

monitoring of basic soil state variables on the experimental site in Bad Lauchstädt

use the CCB model to predict SOC storage and N-fluxes for arable sites in Saxony

completed research activities

Austrian Carbon Calculator
database of European long term experiments
sustainable land use and water management in the Torgau-region (german language only)
impacts of management on nitrogen leaching in the arable regions of Sachsen-Anhalt
river basin management: Weiße Elster, BASINFORM

experimental background

soil monitoring site at Bad Lauchstädt
climate data from Bad Lauchstädt
minirhizotron data from Bad Lauchstädt
atmospheric N-deposition from Bad Lauchstädt

developed models

CANDY: simulates dynamics of carbon nitrogen temperature and water in soil on plot and regional scales
CIPS: a recently developed model of the carbon turnover taking into account soil structure effects that runs as an CANDY add-on
CCB: a strongly simplified carbon turnover model with the same theoretical background like CANDY but running in annual time steps for average climate conditions

reference list

Franko,U., Kuka,K., Romanenko,I., and Romanenkov,V., 2007. Validation of the CANDY model with Russian long-term experiments. Regional Environmental Change, 7(2): 79-91.

Kuka,K., 2005. Modelling the impact of pore space distribution on C-sequestration in arable soils (in German). Diss. UFZ Centre for environmental research.

Kuka,K., Franko,U., and Rühlmann,J., 2007. Modelling the impact of pore space distribution on carbon turnover. Ecological Modelling (accepted).

Puhlmann,M., Kuka,K., and Franko,U., 2006. Comparison of methods for the estimation of inert carbon suitable for initialisation of the CANDY model. Nutrient Cycling in Agroecosystems, 1-10.

Smith,P., Smith,J., Franko,U., Kuka,K., Romanenkov,V., Shevtsova,L., Wattenbach,M., Gottschalk,P., Sirotenko,O., Rukhovich,D., Koroleva,P., Romanenko,I., and Lisovoi,N., 2007. Changes in mineral soil organic carbon stocks in the croplands of European Russia and the Ukraine; comparison of three models and implications for climate mitigation. Regional Environmental Change, 7(2): 105-119.