Figure 5
The final structural equation model of N and P addition effects on soil N transformations and N2O emission in the secondary tropical forest in wet seasons (X2 = 16.53; df = 16, Probability level = 0.417; RMSEA = 0.04; AIC = 56.5) and dry seasons (X2 = 11.51; df = 13, Probability level = 0.568; RMSEA = 0.00; AIC = 57.5).
Numbers on arrows are standardized path coefficients (equivalent to correlation coefficients). Width of the arrows indicates the strength of the causal influence. Green arrows indicate significant positive relationships and red arrows indicate significant negative relationships (P < 0.05). Black arrows indicate nonsignificant positive relationships and grey arrows indicate nonsignificant negative relationships (P > 0.05). Grey dashed arrows indicate paths removed to improve model fits (see Methods). Percentages close to Nitrification and N2O flux indicate the variance explained by the model (R2).
