• Strömmer, Rauni (Project manager)

    Project Details


    The traditional view on the N cycling in ecosystems is currently in a state of transition and it is timely to gain a more fundamental process based understanding of N transformations in soils. Among the processes in nitrogen cycling, the focus of this research will be on nitrification (NH4+ oxidation) and its regulation. Since NH4+ oxidation is embedded into the simultaneously occurring other N transformations in soil, it is important to analyse the nitrification rates in the context of other N transformation rates for keeping the study in relevant ecological context.
    The research will consist of two parallel proceeding themes: 1) determining gross rates of nitrification in samples from the field sites (agricultural fields, pastures, forests), which differ from each others in properties proposed to regulate nitrification, and 2) surveying and quantifying autotrophic ammonia oxidising microorganisms (AOMs) and their functional genes. By studying both the processes and organisms in the same context, we aim to get a better understanding about the mechanisms controlling soil N dynamics. For studying the communities, the most modern molecular tools will be used. Process rates of N transformations will be studied by using 15N techniques to quantify gross N transformation rates. These techniques are based on 15N dilution and enrichment principles, and rate parameters are identified via newly developed optimization method based on Monte Carlo sampling.
    Effective start/end date01/01/200931/12/2012


    • Unknown funder: €375,220.00

    Fields of Science

    • 118 Biological sciences
    • 119 Other natural sciences