Fig. 2From: Changes in soil phosphorus fractions after 9 years of continuous nitrogen addition in a Larix gmelinii plantationChanges in soil inorganic phosphorus (Pi) fractions (extracted by H2O, NaHCO3, NaOH, and HCl) after 9 years of N addition in the larch plantation. Bars represent means with standard errors for n = 3. Different letters indicate significant differences at P < 0.05Back to article page