Fig. 5. Changes in the distribution of (A) organic P in the nontreated litter, (B) inorganic P in the nontreated litter, (C) organic P in the alum-treated litter, and (D) inorganic P in the alum-treated litter as determined by sequential extraction (error bars indicate standard deviation of the mean; values are expressed as a percent of the total P in litter as determined by microwave digestion of whole litter).