Hintergrundbild mit Feldern

sp8 N and P cycling

Nutrients are a major limiting factor for the productivity of ecosystems. Nutrients cycle through all organisms (microorganisms, soil animals, plants) and via inorganic vectors such as water fluxes. Feedbacks of plant diversity on nutrient cycling in soil under grassland e.g., mediated through the vegetation control of microclimate, organic matter input, and adapted microbial communities was observed and might vary with time. The previous phases in the Jena Experiment demonstrated that increasing species richness stimulated ammonification, influenced aboveground phosphorus storage in a similar way as nitrogen storage, and had time-dependent effects on the nitrogen and phosphorus cycles.

However, it remained unclear whether positive effects of species richness on ammonification were cancelled out by negative effects on other nitrogen transformation processes. In our subproject we want to elucidate the underlying processes of accumulation and enhanced release of nutrients in soil with time as related to plant diversity including all major gross and net nitrogen transformation processes and pools with the help of a stable isotope tracer experiment and including P release from organic matter and from the soil mineral phase and to continue monitoring the biodiversity-N and P cycling relationships at the field site of the Jena Experiment.

Principal Investigator:

Prof. Dr. Yvonne Oelmann
University Tübingen
Email / Web
Tel.: ++49.7071.297.2398

Prof. Dr. Wolfgang Wilcke
University of Berne
Email / Web
Tel.: ++41.31.631.3896