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Humus fraction ratios as a means of discriminating between horizon types



Humus fraction ratios as a means of discriminating between horizon types



Canadian Journal of Soil Science 60(2): 219-230



Humus fraction distribution in a wide range of horizon samples was examined by measuring C content in humic acid (Ch), in fulvic acid (Cf) and in the strongly colored polyphenolic component of the fulvic acid fraction (Ca). Fraction distribution was described by the ratios Ch/Cf and Ca/Cf. Humus fraction ratios were related to horizon types as used in the Canadian System of Soil Classification, and were effective in discriminating between certain horizon types, particularly between Luvisolic Bt and Podzolic Bf. Humus fraction ratios may be effective in separating distinct sub-populations within Ah horizons and Bf horizons in general, based on qualitative differences in organic matter present. Aspects of the role of humus fractions in soil genesis are discussed.

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Accession: 000903846

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