Soils, Hydrology, and Geomorphology of the Lisa Matthews Memorial Bay, Bamberg, South Carolina
Authors: Charles J. Everett, PhD, W. Lee Daniels, PhD, Department of Family Medicine, Medical University of South Carolina, Charleston, SC, USA, and others
Abstract: The Lisa Matthews Memorial Bay contains a population of the federally endangered Canby’s Dropwort (Oxypolis canbyi). The wetland depression is similar to a Carolina bay, but lacks the classic elliptical shape of Carolina bays. Canby’s Dropwort is found in the shallow portion of the bay. The 21-hectare preserve is located on the Coastal Plain in Bamberg County, South Carolina, and is owned by the South Carolina Native Plant Society. We undertook a study of the soils, hydrology, and geomorphology of the Lisa Matthews Memorial Bay to aid in the management of the Canby’s Dropwort habitat in the bay and to assist in the restoration of the uplands to longleaf pine (Pinus palustris). Twelve pedons were described and sampled for determination of soil texture, pH, carbon, nitrogen, phosphorus, potassium, calcium, magnesium, manganese, and iron. The upland soils were sampled to a depth of 250 cm, and the soils near and in the bay sampled to shallower depths (100- 180 cm). The bay has a sandy clay loam/sandy clay bottom and the uplands are sandy. The pedons sampled were Typic Dystrudepts (3 sites), a Grossarenic Hapludult, an Aeric Albaquult, an Umbric Endoaquod, Typic Albaquults (5 sites), and an Umbric Paleaquult. The elevation of each pedon was determined using conventional land surveying procedures and water level in the bay measured 36 times in the 30 months from March, 2004, to September, 2006. Water level in the bay ranged from a high of 55.10 m elevation to a low of 54.07 m elevation. One pedon sampled was located in the Canby’s Dropwort habitat and was classified as a Typic Albaquult with the ground elevation at 54.58 m. The deepest portion of the bay never dried out. Distribution of sand, clay and phosphorus showed the uplands and the bay margin/shallow part of the bay represented two distinct episodes of deposition.
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