Abstract
Levels of benzoic and cinnamic acids in low peat soils, maintained for 25 years under four different cropping systems, were studied in field experiments. The soil samples were obtained from four horizons of thirteen selected profiles. Seven phenolic acids were identified by high performance liquid chromatographic (HPLC) techniques and their amounts were determined quantitatively. The concentration of phenolic acids in the soils depended on the cropping system and the depth of the soil profiles. Permanent grassland had the highest yield of phenolic compounds in peat soils. Much smaller amounts were found in the order forest, alternate and field utilization. Thus, phenolic compounds may be useful markers with which to follow the decomposition in peat soils.
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