ALIPHATIC CARBOXYLIC ACIDS IN CHERNOZEMIC SOILS

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Abstract
For Chernozemic soils, published information on the aliphatic carboxylic acid fraction of the organic matter is scarce. Yet, geologically they are chemically stable and persist for long periods of time. The distribution of chloroform/methanol-extractable aliphatic carboxylic acids in five uncultivated and three cultivated Chernozemic soils and the roots of four grass species was, therefore, determined. Twenty-three organic acids (up to C30) were tentatively identified by high resolution gas chromatography-mass spectrometry. Hexanedioic acid and dioctyl phthalate were suspected of being contaminants. The relative proportions of aliphatic carboxylic acids varied for different soils. Tree invasions, overgrazing, and cultivation decreased the total aliphatic carboxylic acid content at the expense of the lower weight aliphatic carboxylic acids. Since the aliphatic carboxylic acids formed only a small portion of the total solvent-extractable organic matter and decreased after cultivation, the results do not explain the observation reported earlier that solvent-extractable organic matter of Chernozemic soils increased as a result of cultivation.

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