Figure legends
Figure 1 Platform for nitrogen addition and altered
precipitation experiments. (A) Experimental treatments: 1, NP−; 2, NP
(CK); 3, NP+ ; 4, N+P−; 5, N+P; 6, N+P+. N: ambient N deposition; P:
ambient precipitation; N+: N addition; P−: 50% reduced precipitation;
P+: 50% increased precipitation. (B) Experimental site.
Figure 2 Seasonal dynamics of N2O flux and (B)
seasonal average N2O flux under different conditions.
(C) Changes in seasonal average N2O flux (compared with
control) under different treatments. (D) Average N2O
flux during the peak period of plant growth. N: nitrogen treatment; P:
altered precipitation treatment; N×P: combination of nitrogen addition
and altered precipitation. Different letters indicate a significant
difference (P < 0.05). Error bars represent the
standard error.
Figure 3 Effects of nitrogen addition and altered precipitation
on abundances of functional genes. (A) ammonia-oxidizing archaea (AOA);
(B) ammonia-oxidizing bacteria (AOB); (C) nirS ; (D) nirK ;
(E) nosZ . N: nitrogen treatment; P: altered precipitation
treatment; N×P: combination of nitrogen addition and altered
precipitation. Different letters indicate a significant difference
(P < 0.05). Error bars represent the standard errors of
the means (n = 5).
Figure
4 Relationships between the N2O flux and abiotic
properties. Regression lines are only shown when significant (P< 0.05).