Katarina Hedlund
Professor
Carbon routes from decomposing plant residues and living roots into soil food webs assessed with C-13 labelling
Författare
Summary, in 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.
Avdelning/ar
- Biodiversitet
- Markgruppen
Publiceringsår
2008
Språk
Engelska
Sidor
2530-2539
Publikation/Tidskrift/Serie
Soil Biology & Biochemistry
Volym
40
Issue
10
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Ecology
Nyckelord
- Compound-specific stable isotope ratio analysis
- Allium porrum L
- Decomposers
- Phospholipid fatty acid
- Grazers
- Soil fauna
- Trifolium
- pratense L.
Status
Published
Forskningsgrupp
- Soil Ecology
ISBN/ISSN/Övrigt
- ISSN: 0038-0717