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Response of Surface Horizons in an Oak Forest to Prescribed Burning

^a Environ. Sci. Div., Oak Ridge National Laboratory, P.O. Box 2008, MS 36, Oak Ridge, TN, 37831 USA
^b Dep. of Plant and Soil Sci., 369 Ellington Plant Sci. Bldg., P.O. Box 1071, Univ. of Tennessee, Knoxville, TN, 37901 USA
^c Dep. of Forestry, 274 Ellington Plant Sci. Bldg., P.O. Box 1071, Univ. of Tennessee, Knoxville, TN, 37901 USA
^d Univ. of Tennessee Forestry Exp. Stn., 901 Kerr Hollow Rd., Oak Ridge, TN, 37830 USA
^e Dep. of Plant and Soil Sci., Cruckshank Bldg., Aberdeen, Scotland, United Kingdom, AB9 2UE

View larger version (155K): [in a new window]   Fig. 1 The dominant microstructure in the upper 1 cm (a–c) and A horizons (d–f) of the different treatment plots: (a) nonburn control plot- fine granular fecal pellets and plant fragment surrounding roots and horizontally oriented leaf material (lf); mite pellets (fp) replacing soft inner tissue of a root (r) (center) in the Oi horizon; (b) periodic plot- fine granular fecal pellets and plant fragments with frequent charcoal fragments (c) in A horizon material mixed into the Oa horizon (charcoal material is horizontally oriented in the upper portion and fragmented and mixed in the lower area of the thin section); (c) annual plot- horizontal oriented charcoal fragments (c) surrounded by occasional fecal pellets (fp) (upper left corner) in the charred layer; (d) nonburn control plot- very fine silt-sized granules, possibly enchytraeid worm fecal pellets (fp) surrounding larger granules; root fragments (r) are present in this horizon; (e) periodic plot- similar structure to (d); with fecal pellets (fp); striated areas (left side) indicated considerable fauna (possibly earthworm) activity; (f) annual plot- discontinuous horizontal laminar microstructure; small black fragments of charcoal speckle the matrix; fragment of sclerotia in the lower right corner. bar = 0.5mm. Notice that compaction of A horizons increase with increased burning