Soil samples were separated on principal component

These samples, with and without vegetation occurrence, also had carbohydrate derivatives, nitrogen compounds, carbohydrates, and two aromatic compounds with retention times at 29.61 and 32.27 min identified as 1,2,3,4-tetramethylnaphthalene. On the other hand, samples closer to the glacier front (without vegetation) tended to have methylated fatty acids, including tricosanoic and tetradecanoic acids, which were not observed in samples with vegetation distance from the glacier front (Fig. 3, Group 1).