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Trophic structure and major trophic links in conventional versus organic farming systems as indicated by carbon stable isotope ratios of fatty acids Organic Eprints
Haubert, Dominique; Birkhofer, Klaus; Fliessbach, Andreas; Gehre, Matthias; Scheu, Stefan; Ruess, Liliane.
Using bulk tissue and fatty acid 13 C analysis we investigated major trophic pathways from soil microorganisms to microbial consumers to predators in conventional versus organic farming systems planted for the first time with maize. Organic farming led to an increase in microbial biomass in particular that of fungi as indicated by phospholipid fatty acids (PLFAs). Microbial PLFAs reflected the conversion from C3 to C4 plants by a shift in δ13C of 2‰, whereas the isotopic signal in fatty acids (FAs) of Collembola was much more pronounced. In the euedaphic Protaphorura fimata the δ13C values in maize fields exceeded that in C3 (soybean) fields by up to 10‰, indicating a close relationship between diet and vegetation cover. In the epedaphic Orchesella villosa...
Tipo: Journal paper Palavras-chave: Soil biology Cereals; Pulses and oilseeds.
Ano: 2009 URL: http://orgprints.org/18191/1/haubert%2Detal%2D2009%2DOikos.pdf
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