The deposition index for atmospheric sulfur and nitrogen deposition (1999-2003) with respect to Ca depletion.
Positive values of the deposition index reflect the capacity of a forest ecosystem to tolerate additional acidic deposition. Negative values of the index correspond to the reduction in S and N deposition required to eliminate present or deter the development of nutrient limitations. Red-orange-yellow areas in this map of New Hampshire and Vermont indicate current S and N atmospheric deposition rates greater than the critical load. The deposition index is expressed in terms of kilo-equivalents of charge per hectare per year. N deposition includes both ammonium + nitrate forms. White areas represent areas with non-forested land or water.
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