Abstract
Fatty acid patterns of phospholipids and lipopolysaccharides were quantitatively determined in six typical environmental samples in order to characterise their microbial community structures. The grassland soil displayed elevated α and mid-chain hydroxy fatty acids, and contained a great numbers of methyl branched saturated fatty acids on C2 and C4. The aggregated soil lacked mainly mid-chain hydroxy, dicarboxylic and ω-hydroxy fatty acids, the latter two are indicators of eukaryotes, therefore exhibited enhanced ratio of βOH fatty acids which symbolise Gram-negative bacteria. The salt marsh lacked Bacillus species, fungi and plants, but contained enhanced proportion of indicators for Desulfovibrio strains and Gram-negative bacteria by its fatty acid composition. The forest layers showed high percentages of indicators of fungi and extremely low proportions of fatty acids contributed by Gram-negative bacteria. The branched chain saturated fatty acids, indicators for actinomycetes and Gram-positive bacteria increased proportionally with the depth of forest layers.
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