2.7. Statistical analyses
Correlation analysis and analysis of variance were performed using SAS
V8.0 statistical software (SAS Institute Inc., Cary, NC, USA).
Graphing analysis was
carried
out with Origin 2018 software (Origin Lab, USA). Double-way ANOVA was
used to analyze the effects of stand age and soil depth on soil
CO2 flux, considered treatment (stand age and soil
depth) as the fixed effect, replication as the random effect, and time
of measurement as the repeated measure variable. Means were separated by
using the least significance difference test. Correlation analysis was
done to determine the relationships between soil CO2flux, SOC, temperature, and moisture when treatments and interactions
were significant. Statistical significance was evaluated at P = 0.05,
unless otherwise stated.