Lipid Biomarkers in a Gleyic Luvisol
Keywords:
lipids, microbial origin, Gleyic Luvisol, GC/MSAbstract
Four soil horizons of a meadow cinnamonic soil (Gleyic Luvisol) were analysed for the lipid biomarker pool. The GC/MS analysis of the lipid fraction showed that lipid signatures were dominated by alkanes (C17 - C33), alkanoic acids (С6 — C18) with minor contribution of > С18 acids in the upper Ah horizon аnd n-alkanols (C14 — C32) maximizing а С26 in the Аh horizon аnd C22 in the lower depths. Carbon Preference Index (CPI) for alkanes decreased from 2.4 — 2.8 in the upper A horizons to 1.4 — 1.6 in the lower G horizon. Lipid sources show that the bacterial contribution increases downward the soil profile as shown by the alkane, fatty acids and n-alkanol distributions, while the upper A horizons reflect the contribution from grass vegetation.
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