Soil Water Contents Control the Responses of Dissolved Nitrogen Pools and Bacterial Communities to Freeze-Thaw in Temperate Soils

Table 1

Soil N pools (mg N kg^-1 dry soil) and the net N mineralization rate (NNMR, mg N kg^-1 day^-1) for each freeze-thaw (FT) treatment (mean (standard deviation)) and results from two-way ANOVA among soil water content (SWC), FT, and their interactions ().

	NO3^-	NH4^+	DTN	MBN	NNMR
W10C	28.74 (0.19)a	7.21 (0.15)b	45.97 (0.13)bc	3.12 (0.66)c	2.60 (0.02)b
W10F	28.78 (1.01)a	8.49 (0.41)a	46.65 (0.44)ab	3.22 (0.30)c	2.78 (0.19)a
W15C	24.79 (0.30)b	2.77 (0.43)d	43.32 (1.09)e	7.82 (0.40)a	1.40 (0.07)d
W15F	25.03 (0.33)b	4.25 (0.50)c	47.29 (0.43)a	7.37 (0.31)a	1.64 (0.08)c
W30C	28.39 (0.39)a	7.43 (0.25)b	44.78 (1.05)d	2.71 (0.13)c	2.58 (0.09)b
W30F	20.91 (0.41)c	8.15 (0.04)a	45.04 (0.61)cd	5.06 (0.31)b	1.61 (0.05)c
Two-way	ANOVA
SWC	162.3	436.1	8.2	302.4	290.9
FT	132.4	70.4	31.6	17.8	20.1
	148.2	2.8	16.3	29.3	99.2

Letters indicate the significant difference in each index among the FT treatments (Duncan’s HSD test, , ). Asterisks ( and ) indicate the significant influence of FT, SWC, and their interactions in two-way ANOVA.