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Changes in Soil Mineralogy and Texture Caused by Slash-and-Burn Fires in Sumatra, Indonesia

^a Environmental Science Graduate Program, Ohio State Univ., 2021 Coffey Road, Columbus, OH 43210 USA
^b School of Natural Resources, Ohio State Univ., 2021 Coffey Road, Columbus, OH 43210 USA

View larger version (21K): [in a new window]   Fig. 1 X-ray diffraction patterns, showing anatase (A), gibbsite (Gb), goethite (Go), hematite (H), kaolinite (K), and quartz (Q), of the silt fraction from topsoil exposed to different intensities of burns in Field Experiment II

View larger version (25K): [in a new window]   Fig. 2 X-ray diffraction patterns, showing anatase (A), gibbsite (Gb), goethite (Go), hematite (H), kaolinite (K), maghemite and/or magnetite (M), and quartz (Q), of the clay fraction prior to burning (slashed soil) and following combustion at >600°C in Field Experiment II

View larger version (29K): [in a new window]   Fig. 3 Effect of fire intensity on the contribution of citrate-bicarbonate-dithionite (CBD)-extractable Fe oxides to the total bulk soil magnetic susceptibility (Field Experiment II). Error bars indicate standard deviations of the means

View larger version (22K): [in a new window]   Fig. 4 X-ray diffraction patterns showing hematite (H), magnetite (Ma), and maghemite (Mh) of the black (a) and orange-brown (b) ferrimagnetic fractions obtained from completely combusted topsoil in Field Experiment II. X-ray diffraction d spacings (nm) are given for an unidentified phase

View larger version (19K): [in a new window]   Fig. 5 Effect of organic material addition (Indian tea) on maximum achievable mass-specific magnetic susceptibility for initially unburned topsoil (0–5 cm) and subsoil (5–15 cm) in Oven Experiment I. Samples were heated at 600°C for 930 min to ensure complete combustion. OC is organic C

View larger version (21K): [in a new window]   Fig. 6 Mass-specific magnetic susceptibility (lf) as a function of time and temperature of exposure for forest topsoil (0–5 cm, 67 g kg-1 organic C, 12 g kg-1 Fe) and subsoil (5–15 cm, 20 g kg-1 organic C, 24 g kg-1 Fe) in Oven Experiment II. On the right for each treatment is the lf measured after 660 min exposure