![graph of nutrient pool sizes and erosion fluxes, showing inverse relationship between the two](gifs/cobo7.gif)
- Unit D, the reference plot, has not burned since at least the
1950s.
- Unit C burned once, during the 1975 "baseline" fire.
- Unit B burned twice, in 1975 and 1981.
- Unit A burned three times, in 1975, 1981, and 1986.
- C.I.C. = Cation interchange (or exchange) capacity
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