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Gross nitrogen mineralization-, immobilization-, and nitrification rates as a function of soil C/N ratio and microbial activity

  • Göran Bengtsson
  • Per Bengtson
  • Katarina Månsson
Publishing year: 2003
Language: English
Pages: 143-154
Publication/Series: Soil Biology & Biochemistry
Volume: 35
Issue: 1
Document type: Journal article
Publisher: Elsevier

Abstract english

A laboratory experiment was designed to challenge the idea that the ON ratio of forest soils may control gross N immobilization, mineralization, and nitrification rates. Soils were collected from three deciduous forests sites varying in C/N ratio between 15 and 27. They were air-dried and rewetted to induce a burst of microbial activity. The N transformation rates were calculated from an isotope dilution and enrichment procedure, in which (NH4Cl)-N-15 or (NaNO3)-N-15 was repeatedly added to the soils during 7 days of incubation. The experiments suggested that differences in gross nitrogen immobilization and mineralization rates between the soils were more related to the respiration rate and ATP content than to the C/N ratio. Peaks of respiration and ATP content were followed by high rates of mineralization and immobilization, with 1-2 days of delay. The gross immobilization of NH4+ was dependent on the gross mineralization and one to two orders of magnitude larger than the gross NO3- immobilization. The gross nitrification rates were negatively related to the ATP content and the C/N ratio and greatly exceeding the net nitrification rates. Taken together, the observations suggest that leaching of nitrate from forest soils may be largely dependent on the density and activity of the microbial community.


  • Ecology
  • Biological Sciences


  • Microbial Ecology
  • ISSN: 0038-0717
Per Bengtson
E-mail: per [dot] bengtson [at] biol [dot] lu [dot] se



+46 46 222 37 60


Sölvegatan 37, Lund


Research group

Microbial Ecology


Doctoral students and postdocs

PhD students, main supervisor


PhD students, assistant supervisor

Jian Li

Experimental setup