Document: MUZ-3-69-1

Gap dynamics in late-successional shortleaf pine forests in the Missouri Ozarks.

STAMBAUGH, M.C.* and R.M.MUZIKA

University of Missouri, Columbia, MO 65211 USA ¹

Abstract:
Late-successional shortleaf pine (Pinus echinata) forests are one of the rarest forest types in the Ozark Interior Highlands. Historically, this forest type occurred on an estimated 2.7 million ha, but presently is found on approximately 200,000 ha. With the exclusion of fire, smaller disturbances resulting in canopy gaps represent the dominant form of disturbance influencing regeneration. In this study, we explored gap formation and the influence of gaps on regeneration of shortleaf pine. An entire gap inventory was done for two forests, for a total area of 69 ha. A total of 58 gaps were found. Average gap size, i.e. canopy opening, was 148m² and expanded gap size was 432.5m². Gaps were more common on ridges and convex slopes. Shortleaf pine regeneration accounted for less 1% of all regenerating tree seedlings and saplings. Gap size appears to have no influence on regeneration of shortleaf pine. Regeneration was significantly greater, however, in gaps with a high proportion of exposed soil surface and in gaps on steep slopes. Regeneration was negatively influenced by increasing litter depth and increasing distance from seed source.

Keywords: gap dynamics; Ozarks; Pinus echinata

This abstract is being presented at: 10:30 AM in session:
Poster Session #12: Disturbance Ecology.