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Soil Color as an Indicator of Slash-and-Burn Fire Severity and Soil Fertility in Sumatra, Indonesia

School of Natural Resources, Ohio State Univ., 2021 Coffey Road, Columbus, OH 43210 USA

View larger version (29K): [in a new window]   Fig. 1 Effect of fire and climatic exposure with time (1–90 d following the secondary pile burn) on (A) soil C, (B) exchangeable Ca, and (C) Al saturation at the 0- to 5-cm depth. Numbers indicate the standard error of difference for each sampling time

View larger version (31K): [in a new window]   Fig. 2 Redness susceptibility (R = hue25 - hue550, where hue25 is hue of field-burned soil and hue550 is the hue after 8 h of exposure to 550°C) of surface (0–5 cm) and subsurface soil (5–15 cm) exposed to different peak surface temperatures during a broadcast field burn. Alphanumeric Munsell hues were converted to numerical values by using a Munsell hue circle (Chamberlin and Chamberlin, 1980) before calculating redness susceptibility. With this conversion 10R = 10, 10YR = 20, and 10Y = 30. Different letters (surface soil only) indicate significant differences at P < 0.05

View larger version (25K): [in a new window]   Fig. 3 Effect of static heat exposure over time on (A) Munsell hue, (B) Munsell value, and (C) Munsell chroma. Alphanumeric Munsell hues were converted to numerical values by using a Munsell hue circle (Chamberlin and Chamberlin, 1980). With this conversion 5YR = 15, 5Y = 25, and 5GY = 35

View larger version (21K): [in a new window]   Fig. 4 Soil color parameters of field burned soil after recombustion at 550°C for 8 h as a function of the amount of citrate-bicarbonate-dithionite-extractable Fe. Alphanumerical Munsell hues were converted to numerical values by using a Munsell hue circle (Chamberlin and Chamberlin, 1980). With this conversion 5YR = 15 and 10YR = 20