Abstract
Bound phenolic acids, released from soil humic acids (HA) by hydrolysis, were determined in a number of situations involving contrasting vegetation. In a study of three vegetation zones on the flanks of a volcano in central Mexico, changes in vegetation were associated with changes in relative proportions of lignin-derived phenolic acids. A comparison of HAs from B horizons of Canadian soils, formed under coniferous forest and grassland respectively, showed similar trends, with syringic acid relatively more abundant in the latter. A study of HA from English woodland soils also showed distinctive phenolic acid ratios related to vegetation. Some vegetation effects persisted even on such contrasting soil parent material as state and limestone. It was suggested that phenolic acid analysis could, in some situations, be useful in determining the origin of contaminating organic sediments in a local water supply.
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