Fig. 3. Total phosphorus (TP), total organic phosphorus (TPo), and total inorganic phosphorus (TPi) in the surface 50 cm of peat in drained cores. Mean values from replicate cores are given (n = 3), error bars show ±1 standard deviation. TP is the sum of TPo and TPi, TPo the sum of NaOH-Po and residual-Po, and TPi the sum of KCl-Pi, NaOH-Pi, and HCl-Pi from the P fractionation scheme of Reddy et al. (1998).