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Relationship between Soil Aliphatic Fraction Extracted with Supercritical Hexane, Soil Microbial Biomass, and Soil Aggregate Stability

Bayerische Landesanstalt für Bodenkultur und Pflanzenbau, 8000 München 19, Menzinger Str. 54, W. Germany

P. Härter

Institut für Anorg. Chemie der Technischen Universität, 8046 Garching, W. Germany

* Corresponding author.

ABSTRACT

Although the aliphatic component represents an important fraction of the soil organic matter, there is still a lack of information concerning its origin, chemistry, and role. The influence of agricultural management on the quality and quantity of the aliphatic fraction extracted with supercritical n-hexane and the correlation between this fraction, soil biomass, and soil aggregate stability was investigated. High correlation coefficients were found between the aliphatic fraction and soil biomass (r = 0.91) and between the aliphatic fraction and soil aggregate stability (r = 0.91), indicating a close relationship between soil biochemistry and soil physics. It appears that the hydrophobic fraction extracted with supercritical hexane contributes considerably to the water stability of soil aggregates. The ¹³C nuclear magnetic resonance and Fourier-transform infrared spectra showed that the supercritical-hexane extracts corresponding to different managements were chemically similar. Agricultural management influenced mainly the quantity of the aliphatic fraction extracted with supercritical hexane.

Contribution from the Bayerische Landesanstalt für Bodenkultur und Pflanzenbau.

Received for publication January 31, 1989.

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