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Enzymatic Activities and Extractable Organic Matter in Soils Invaded by Lycopodium tristachyum Fairy Rings¹

ABSTRACT

The interaction of fairy rings of Lycopodium tristachyum Pursh. with the soil which they invade was examined by measurement of various soil enzymatic activities and extractable soil organic matter. The activities of cellulase, xylanase, inulinase, -galactosidase, invertase, peroxidase, chitinase, and polygalacturonase were enhanced in soil under the rings compared with soil just outside the rings. The activity of urease was lower under the ring while the activity of ß-glucosidase was unaffected. The amount of nitrogen, hexose, and phenolics extracted by 0.01M CaCl₂ during autoclaving was enhanced in soil under the ring. The level of reducing substances extracted by dilute buffer and the optical density of buffered extracts were similarly elevated. Extractable lipid, humic acid, and ß-humus were independent of soil location. Significant correlations between some readily extractable organic components and the activities of chitinase, invertase, xylanase, and -galactosidase in the soil were observed.

¹ Cornell Univ., Dep. of Agron., Paper no. 1200. This work was supported by NSF Grant GB-35636.

² Former Graduate Research Assistant and Associate Professor of Soil Organic Chemistry, Cornell Univ., Ithaca, NY 14853.

Received for publication April 28, 1977.