2.6 Calculations and statistical analysis
Statistical analysis was performed with R Studio (R version 3.5.2, CDN,
Global) using one-way ANOVA, and significant differences between single
treatments were analyzed using Tukey’s post-hoc test (p <
0.05). Structural equation
modeling (SEM) was performed using the Amos 17.0 software package
(Smallwaters Corporation, Chicago, IL, USA) to test the significance of
the hypothesized causal relationships among total C, MBC/MBN, BG/NAG,
XYL/NAG, DOC/NH4+,
DOC/NO3-, and CO2emissions. The log-transformed CO2, SOC,
DOC/NH4+,
DOC/NO3-, MBC/MBN, BG/NAG, and XYL/NAG
were used to perform SEM on the data statistics and conceptual
assumptions (Hu et al., 2014). The best-fit model was determined using a
chi-square test (χ2), P -values, goodness-of-fit
index (GEI), root mean square error of approximation (RESEA), and Akaike
information criteria (Chen et al., 2016).
RESULTS