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Interactions Among Vesicular-Arbuscular Mycorrhizae, Soil, and Landscape Position¹

ABSTRACT

The interrelationships among mycorrhizae, soil, and landscape position were investigated for a bahiagrass pasture (Paspalum notatum Flugge) in northern Florida. A significant effect of landscape position was found for spore number, root colonization, root length, the ratio of Acaulospora and Glomus to Gigaspora spores, and number of spores per centimeter of colonized root. Root colonization and propagule numbers were least in the most erosive positions (shoulder and backslope) of the landscape. This implied that the population density of vesicular-arbuscular mycorrhizae (VAM) fungi may be reduced by soil erosion even if erosion is not severe enough to affect plant cover. The pattern of soils across the landscape influenced the distribution of genera of VAM fungi; soils in footslope positions had sandier surface textures as a consequence of erosional/depositional processes and favored higher populations of Gigaspora than of Acaulospora and Glomus.

¹ Florida Agric. Exp. Stn. Journal Series no. 7591.

² Graduate Student, Assistant Professor, and Associate Professor, Soil Sci Dep., 2169 McCarty Hall, Univ. of Florida, Gainesville, FL 32611. Reprint requests should be sent to D.M. Sylvia.

Received for publication October 6, 1986.