Menu

Javascript is not activated in your browser. This website needs javascript activated to work properly.
You are here

Carbon routes from decomposing plant residues and living roots into soil food webs assessed with C-13 labelling

Author:
  • Sara Elfstrand
  • Jan Lagerlöf
  • Katarina Hedlund
  • Anna Martensson
Publishing year: 2008
Language: English
Pages: 2530-2539
Publication/Series: Soil Biology & Biochemistry
Volume: 40
Issue: 10
Document type: Journal article
Publisher: Elsevier

Abstract english

This field experiment investigated how C from fresh organic amendments and from a growing leek crop was allocated into different soil microbial and faunal groups in an arable field. A C-13-enriched red clover green manure was incorporated in one treatment, while the growing leek crop was pulse labelled with (CO2)-C-13 in another. Incorporation of C-13 into microbial fatty acids, micro- and macroarthropods, enchytraeids and earthworms was determined on several occasions during the growing season in order to determine whether different groups or species of microorganisms and fauna were specialised on either the decomposing green manure material or root-derived C. Compound-specific stable isotope ratio analysis showed fatty acid markers of actinomycetes and Gram-positive bacteria to be more strongly linked to C originating from the decomposing green manure material, whereas the marker for arbuscular mycorrhizal fungi was more linked to C from the growing leek crop. In contrast, several markers for Gram-negative bacteria were the most C-13-enriched and had incorporated more C-13 than the other phospholipid fatty acids in both treatments, indicating a general dominance irrespective of C source. Most soil fauna seemed to derive their C directly or indirectly from the decomposing plant material, while C from the growing crop appeared to be of secondary importance in this agroecosystem. (C) 2008 Elsevier Ltd. All rights reserved.

Keywords

  • Ecology
  • Compound-specific stable isotope ratio analysis
  • Allium porrum L
  • Decomposers
  • Phospholipid fatty acid
  • Grazers
  • Soil fauna
  • Trifolium
  • pratense L.

Other

Published
  • Soil Ecology
  • ISSN: 0038-0717
Katarina Hedlund
E-mail: katarina [dot] hedlund [at] biol [dot] lu [dot] se

Professor

Biodiversity

+46 46 222 37 98

+46 72 562 10 04

E-A321

50

Researcher

Centre for Environmental and Climate Research (CEC)

+46 46 222 37 98

50

Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden