Wednesday, November 7, 2007
315-4

Using Historical Photos and Current Elevation Data to Identify Suitable Locations for Pine Rockland Restoration within the Hole-in-the-Donut, Everglades National Park.

Lauren Serra1, Nicholas Comerford2, and Craig Smith1. (1) Department of Interior National Park Service, Everglades National Park, 40001 State Road 9336, Homestead, FL 33034, (2) PO Box 110290, University of Florida, University of Florida, Soil & Water Science Department, Gainesville, FL 32611-0290

The Hole-in-the-Donut (HID) is a 6,000-acre wetland restoration project where Everglades National Park is restoring previously farmed land after removing invasive woody vegetation. Much of the HID was rock-plowed and fertilized, which converted low-nutrient, poorly aerated soils to richer aerated soils that were readily invaded by Brazilian pepper (Schinus terebinthifolius). Mechanically clearing Brazilian pepper and scraping away disturbed soils to limestone bedrock restores conditions conducive to colonization and dominance by native wetland vegetation. Restoration of pre-farming pine rockland dominated by South Florida slash pine (Pinus elliottii var. densa) is slow, particularly in areas removed from a pine seed source. Pine rockland once occupied approximately 15% of the Hole-in-the-Donut, and recruitment has occurred in restored areas adjacent to seed sources. The objective of this research was to identify suitable areas for pine rockland restoration, based upon interpretation of 1940's aerial photos and current elevation data. Aerial photos were used to delineate historical pine rockland areas, while elevation data was used to select currently favorable locations for restoration. It is hypothesized that South Florida slash pine is more likely to survive at high elevations, given that this species presence has been attributable to higher surface elevation, more mesic hydroperiod, significant burn history, and microsite soil differences; with hydroperiod being the primary controlling site characteristic. Techniques for jump-starting pine establishment are currently being tested within these areas. Pinus elliottii var. densa seeds were collected in October 2006, and direct seeding was done in March 2007 over a range of elevations, following a pre-treatment burn. Future research will include planting of South Florida slash pine seedlings by elevation and a microcosm study, both to investigate the effects of hydroperiod on Pinus elliottii var. densa. These studies will indicate to what degree the imperiled pine rockland community can be restored in the HID.