*2.5. Data Analysis*

Using the One-way analysis of variance (ANOVA) for four kinds of plants soil DOC, NH4 +, NO3 −, AN, AP, and pH di fference analysis, when the di fference is significant, using LSD (least significant difference) comparison (*p* = 0.05). Nested ANOVAs were used to analyze the effects of N addition (N), phosphorous addition (P), function type plant (f), and understory species (S, nested within Function type plant) on litter and soil C, N, and P and their stoichiometry. The variation trends of C, N, and P concentrations in the litter of two functional plants and the soil were fitted by one-dimensional regression equation. All statistical analyses were conducted by JMP 9.0 (SAS Institute, Cary, NC, USA).
