Effect of Freeze-Thaw on a Midtemperate Soil Bacterial Community and the Correlation Network of Its Members
Table 1
Soil MBN (mg N kg−1 dry soil), PA (mg tyrosine kg−1 dry soil h−1), and NRA (µg -N/g dry soil day−1) for all of the treatments.
Amplitude test
Frequency test
SWC test
15F
9F
3F
Con
15TF
6TF
1TF
10PF
10PC
30PF
30PC
MBN
1.89 (0.17) c
2.18 (0.12) c
2.77 (0.07) b
3.50 (0.85) a
4.85 (0.24) b
5.41 (0.21) a
2.79 (0.02) c
2.32 (0.14) b
2.28 (0.02) b
2.86 (0.26) a
3.10 (0.10) a
PA
115.9 (4.9) b
205.7 (6.6) a
130.4 (8) b
120.8 (3.4) b
154.2 (2.6) a
132.1 (2.7) b
118.0 (0.5) c
102.5 (4.8) c
100.7 (3.6) c
179.9 (1.1) b
221.2 (6.9) a
NRA
1.33 (0.00) a
1.22 (0.01) b
0.95 (0.01) c
1.17 (0.03) b
1.05 (0.01) b
1.19 (0.03) a
0.95 (0.01) c
1.32 (0.02) a
1.24 (0.02) b
1.08 (0.05) d
1.19 (0.00) c
Values are given as the mean (SD), n=4. MBN, PA, and NRA indicate microbial biomass nitrogen, protease activity, and nitrate reductase activity, respectively. Different letters indicate significant differences among the treatments in each test (Tukey’s HSD test, n=4) at P < 0.05.
