Table 2 Variation of soil CH4 concentrations
(μL L-1) averaged for with soil depth (SD) at the
jointing, heading, and filling stages of wheat growth period under the
fertilization levels of 75% (75% NF), 100% (NF) and 125% (125% NF)
of the normal fertilizer application rate and the groundwater depths
(GD) of 20, 40, 50, 60, and 80 cm. The values shown are the means of
three replicates ± standard deviations. Within a treatment, the means
followed by different lowercase letters are significantly different atP ≤ 0.05 as determined by the LSD test
Table 3 ANOVA statistical
significance of between-subject effects and within-subject effects for
groundwater depth (GD) and fertilization levels (FL) on soil
CO2 and CH4 concentrations, root
parameters, shoot biomass, and root-shoot ratio. *, **, and *** indicate
statistical significance respectively at 0.05, 0.01, and 0.001
probability levels; NS indicates no significance at 0.05 statistical
level