Aquods and Psammaquents: Problems in Hydric Soil Identification
Soil scientists have encountered difficulties in applying standard techniques for making hydric soil determinations in many sandy soils, including the sandy Aquods and the Psammaquents. Much of the problem appears to be related to the lack of mottling characteristics or redoximorphic features in sandy soils with little Fe. A study was conducted to monitor the hydrology and characterize the soils and vegetation of a cypress-slash pine flatwoods ecosystem in north-central Florida. Water-table levels were monitored biweekly in 122 wells at the 42 ha site. Transects at each well were made to inventory the vegetation on soils that are dominantly sandy Spodosols. The morphology of the soils was characterized and hydric soil determinations were made at each well using a new list of indicators developed by the Natural Resources Conservation Service (NRCS) in Florida. Results show a good relationship between the hydric-nonhydric soil determinations and hydrology (87% agreement), with a lesser relationship between hydric-nonhydric soil determinations and vegetation (<80% agreement). The largest agreement between soils and hydrology as well as vegetation and hydrology was with a seasonal high water table at a depth of 15 cm or less for 12.5% of the growing season. The study helps substantiate the use of the Florida NRCS hydric soil indicators in sandy soils, and promotes discussion on the water-table depth that should be used to meet the hydrologic definition of wetlands.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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