N: nitrogen treatment; P: altered precipitation treatment; N×P:
combination of nitrogen addition and altered precipitation. AGB:
aboveground biomass; BGB: belowground biomass. Data are represented by
mean ± SE (n = 5). Bold values indicate that treatment effects are
significant (P < 0.05). Different lowercase letters
indicate significant difference (P < 0.05). The block
was used as a random factor in the two-way ANOVA.
Table 3 Pearson correlation analysis of the relationships
between N2O flux and functional genes abundance (n = 30
for N2O flux and functional gene, significance: *P < 0. 05; ** P < 0.01)