The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

The effects of glucose loading rates on bacterial and fungal growth in soil

På svenska

Author

Summary, in English

Microbial activity in soil is usually limited by the availability of carbon (C). Adding an easily available C source, like glucose, has therefore been a common approach to study alleviation of resource limitations. Most such studies have relied on respiration to study microbial dynamics, with few following the explicit growth response. We determined the response in bacterial and fungal growth, as well as respiration, to additions of glucose (0.5-32 mg C g(-1) soil) during up to 6 days, using leucine incorporation for bacterial growth and acetate-in-ergosterol incorporation for fungal growth. A concentration of 2 mg glucose-C g(-1) soil, where the fungal contribution appeared to be small, was also studied with a high time resolution. Adding glucose resulted in an initial lag phase of stable respiration and bacterial growth. Bacterial growth was similar to the unamended control, while respiration was 8 fold higher during this period. The 14-h lag phase was followed by an exponential increase for both respiration and bacterial growth, with a similar intrinsic growth rate (mu) of around 0.25 h(-1). After the exponential phase, bacterial growth decreased exponentially. The respiration initially decreased even more rapidly than bacterial growth. At concentrations exceeding 4 mg glucose-C g(-1) the relative stimulation of fungal growth surpassed that of bacteria, with the highest amendment rates, 32 mg C g(-1), resulting in mainly fungal growth. Lower loading rates than 4 mg glucose-C g(-1) appeared to stimulate mainly bacterial growth. (C) 2013 Elsevier Ltd. All rights reserved.

Publishing year

2014

Language

English

Pages

88-95

Publication/Series

Soil Biology & Biochemistry

Volume

70

Document type

Journal article

Publisher

Elsevier

Topic

  • Biological Sciences

Keywords

  • Substrate loading rates
  • Glucose
  • Bacterial growth
  • Fungal growth
  • Respiration
  • H-3-leucine incorporation
  • C-14-acetate incorporation
  • Mineralisation
  • Decomposition

Status

Published

Project

  • Interaction between fungi and bacteria in soil
  • Effect of environmental factors on fungal and bacterial growth in soil
  • Microbial carbon-use efficiency

Research group

  • Microbial Ecology

ISBN/ISSN/Other

  • ISSN: 0038-0717