Note: DF1 and DF2 denote the numerator and denominator degrees of freedom, respectively. **, P< 0.001; *, P < 0.05.
Table S3 Effects of warming (W), nitrogen addition (N), year (Y) and their interactions on plant density, plant coverage and plant height of C3 and C4 plants group from 2013 to 2022, based on a repeated-measures analysis of variance (ANOVA).