Fifty years of prescribed burning: effects on soil
organic matter composition and podzolization in a Spodosol soil profile in the southeastern United States. (5601)
Authors:
S.S. Kelley - USDOE-NREL, Golden, CO R.J. DiCosty* - USDA-FS, Athens, GA T.G. Rials - Univ. of Tenn., Knoxville, TN J.A. Stanturf - USDA-FS, Athens, GA
Abstract:
We evaluated the role of fire in soil genesis by sampling Spodosols under pine forest in Florida (USA), where different prescribed burning regimes (unburned, annually burned, burned every four years) have been in place for 50 years. Overall carbon chemistry (as determined by pyrolysis molecular-beam mass spectrometry and near infrared spectroscopy) differed significantly with fire regime in the A, E, and B horizons. Accordingly, we hypothesized that fire affects the podzolization process (downward movement of organo-metal complexes) and present data on the amounts of oxalate-extractable aluminum, iron, and phosphate in the mineral
horizons as a function of fire frequency.
Speaker Information: Ralph DiCosty, USDA-FS, Athens, GA, 320 Green Street, Athens, GA 30602; Phone: 706-559-4318; E-mail: [email protected]
Session Information: Monday, November 1, 2004, 2:00 PM-4:00 PM Presentation Start: 2:00 PM (Poster Board Number: 2239)
Keywords: carbon cycle; fire; near infrared; podzolization