Overview

Description of research and teaching

After completing MSc degree on plant ecology, I focused my research to soil ecology, especially to nitrogen cycling and the role of mycorrhizal fungi and other soil organisms in forest ecosystems. The impact of N fertilization and N deposition on microorganisms and processes in forest soils become the topic of my PhD studies After receiving my PhD degree in 1990, I spent a post-doctoral 10 months at Petawawa National Forestry Institute in Ontario, Canada, where I had an opportunity to study the response of soil microbial community to several silvicultural practices in a large scale plantation ecosystem. After the period (1991-1998) as a lecturer and an associate professor in the University of Oulu, I got my present position as a professor on soil ecology in the University of Helsinki in 1998.

In the present Soil Ecology Research group, the most actual topic is N cycling in ecosystems. Among the processes in N cycling, the focus of the present research is in nitrification and its regulation. 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 molecular tools will be used. Process rates of N transformations will be studied by using 15N techniques to quantify gross N transformation rates. Other recent studies concern diversity of ectomycorrhizal communities in Pb contaminated forest soil, and the impact of wood ash as a fertilizer on ectomycorrhizae and microbial processes in forest soils.

Highlighted publications

  1. EcM fungal community structure, but not diversity, altered in a Pb-contaminated shooting range in a boreal coniferous forest site in Southern Finland.

    Hui, N., Jumpponen, A., Niskanen, T., Liimatainen, K., Jones, K., Koivula, T., Romantschuk, M. & Strömmer, R. 2011 In : FEMS Microbiology Ecology. 76, 1, p. 121-132 12 p.

    Publication: Contribution to journalA1 Refereed journal article

  2. Natural attenuation is enhanced in previously contaminated and coniferous forest soils

    Kauppi, S., Romantschuk, M., Strömmer, R. & Sinkkonen, A. 2012 In : Environmental Science and Pollution Research International. 19, 1, p. 53-63 11 p.

    Publication: Contribution to journalA1 Refereed journal article

  3. Testing the homogenizing effect of low copper sulfate concentrations on the size distribution of Portulaca oleracea seedlings in vitro

    Sinkkonen, A., Penttinen, O-P. & Strömmer, R. 2009 In : Science of the Total Environment. 407, 15, p. 4461-4464 4 p.

    Publication: Contribution to journalA1 Refereed journal article

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Highlighted activities

  1. Supervision of doctoral thesis, Nan Hui

    Rauni Strömmer (Supervisor), 2010

    Activity: Thesis supervision, mentoring and examinationSupervisor or co-supervisor of doctoral thesis

  2. Recycling of Biomass Ashes

    Rauni Strömmer (Member of organizing committee), 22.03.201023.03.2010

    Activity: Conferences, workshops, courses, seminarsOrganisation and participation in conferences, workshops, courses, seminars

  3. Assistant supervision of doctoral thesis, Oili Tarvainen

    Rauni Strömmer (Co-supervisor), 2009

    Activity: Thesis supervision, mentoring and examinationSupervisor or co-supervisor of doctoral thesis

  4. Assistant supervision of doctoral thesis, Hannamaria Potila

    Rauni Strömmer (Co-supervisor), 2008

    Activity: Thesis supervision, mentoring and examinationSupervisor or co-supervisor of doctoral thesis

View all (54) »