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Decrease in soil microbial activity and biomasses owing to nitrogen amendments

Author

Summary, in English

Microbial biomass and soil respiration rate decreased after application of 150 kg NH4NO3–N∙ha−1 to different coniferous forest podzols. The decrease was already found 3 months after fertilization and was still evident after 3–5 years. Changes in pH, organic matter, or water content in the soils could not explain the decreases. In laboratory experiments, several unfertilized forest soils were treated with 2 mg of NH4NO3–N or of urea–nitrogen∙g wet soil−1. The ammonium nitrate addition resulted in severe depressions of the respiration rates during and up to 175 days of incubation and the decrease was evident after about 1 week. The urea treatment initially increased the respiration rate of the soils, but this appeared to be a transitory effect.

Publishing year

1983

Language

English

Pages

1500-1506

Publication/Series

Canadian Journal of Microbiology

Volume

29

Issue

11

Document type

Journal article

Publisher

National Research Council Canada

Topic

  • Biological Sciences

Status

Published

Research group

  • Microbial Ecology

ISBN/ISSN/Other

  • ISSN: 0008-4166