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Various kinds of soil-surface microsites occur on ioess-mantled Aridisois in central and northern Nevada. Tbis study evaluates the potential of trampled and untrampled micro&es to influence natural revegetation and either secondary succession or retrogression. Microsites present on different soil surfaces included the litterand moss-covered Type I surface that occurs under tbe shrub canopy; the trench-lie cracks and pinnacled polygons of tbe Type II surface that occur adjacent to the Type I surface; and the narrow cracks and smooth polygons with crusted, vesicular structure of the Type III surface tbat occurs in tbe interspaces between shrubs. Emergence and survival of Wyoming big sagebrush generally were greatest on the Type I and III surfaces, in the untrampled crack microsite of the Type III surface, and on the heavily trampled polygon microsite of the Type III surface. Emergence and survival of perennial grasses generally were greatest on tbe untrampled Type I surface, in the untrampled trench microsite of the Type II surface, and on moderately trampled trench and pinnacle microsites of the Type II surface. Emergence of annual and perennial forbs generally was greatest on untrampled trench and crack micro&es of the Type II and III soil surfaces. Heavy trampling of trench and crack microsites reduced the emergence of perennial grasses, and both moderate and heavy trampling reduced the emergence of annual and perennial forbs. Tbe potential for seeondary succession would appear to be greatest where Types I and II surfaces and associated microsites predominate on a site and when trampling is moderate or absent. Tbe potentiai for retrogression would appear to be greatest where tbe Type III surface and associated microsites predominate and when trampling is heavy.

Effects of Soil-Surface Morphology on Emergence and Survival of Seedlings in Big Sagebrush Communities