Competitive patterns of N partitioning between plants and microorganisms in intact plantsoil-systems
Project description
Our knowledge on ecosystem N cycling processes is largely falsified by the disregard of plant-microbe
interactions and –competition for N, and by the enormous variability of belowground N fluxes in
space and time. To elucidate competitive patterns of N partitioning between beech and
microorganisms and their responses to changing environmental conditions, stable isotopes (15N,
13C) will be followed in field experiments, lysimeter and microcosm studies through the plant-soil
system. Triple labelling approaches (15N/13C glutamine, 15NH4+, 15NO3-) in mini-lysimeters in
combination with 15N tracing modelling will allow to simultaneously mimic major N fluxes in intact
plant-soil systems, and thus, to characterise plant-microbe competition in a process-oriented way.
Furthermore, N2 and N2O emissions from intact soil cores will be measured directly in order to
quantify the role of denitrification in the competition for NO3-. Near infrared spectroscopy (NIRS) will
be used to measure indicators of competition for N with high resolution in order to overcome the
high temporal and spatial variation of N fluxes and competitive patterns of N partitioning.
Prof. Dr. Heinz Rennenberg
Phone: +49 761 203 8300
Email: [email protected]
Dr. Judy Simon
Phone: +49 761 203 8309
Email: [email protected]
Project duration:
Project start:
Project end:
Project leader:
Heinz Rennenberg
Chair of Tree Physiology
Institute of Forest Sciences
Georges-Köhler-Allee 53/54
79110 Freiburg i. Br., Germany
Phone: +49 (0)761 203 8300
+49 (0)761 203 8302
Email: [email protected]

Competitive patterns of N partitioning between plants and