Table 2 Physicochemical characteristics of soil samples under different fertilization treatments and soil depths.

From: Long-term effects of straw return and straw-derived biochar amendment on bacterial communities in soil aggregates

Items

0–20 cm

20–40 cm

CK

CF

CS

CB

CK

CF

CS

CB

pH (H2O)

8.51(0.67)a

8.21(0.55)ab

8.01(0.42)b

8.60(0.24)ab

8.81(0.27)a

8.44(0.53)a

8.48(0.25)a

8.73(0.04)a

SOC (g kg−1)

7.98(1.51)b

9.09(0.70)b

9.61(3.27)ab

13.08(0.58)a

3.31(0.91)b

3.10(0.69)b

5.01(0.30)a

5.54(1.17)a

AP (mg kg−1)

30.49(0.72)b

31.91(3.58)ab

33.12(2.14)ab

35.35(2.83)a

29.85(0.39)bc

27.86(1.97)c

32.85(2.29)ab

34.71(3.42)a

NO3−–N (mg kg−1)

14.20(0.09)c

19.60(0.40)b

19.50(0.22)b

20.40(0.42)a

8.24(0.03)c

12.39(0.16)b

12.80(0.10)ab

13.87(0.13)a

NH4+–N (mg kg−1)

3.10(0.06)b

4.30(0.08)a

4.40(0.10)a

4.30(0.07)a

2.76(0.07)c

3.89(0.09)b

4.05(0.06)a

3.92(0.10)ab

Water content (%)

23.00(2.86)b

24.38(1.69)ab

27.28(2.44)a

26.75(1.76)ab

20.87(1.41)a

26.40(5.78)a

24.58(2.69)a

24.55(2.40)a

CEC (cmol kg−1)

14.61(0.89)c

20.61(1.15)b

25.38(0.75)a

26.92(0.35)a

11.16(0.27)c

16.54(1.15)b

22.18(0.78)a

23.45(0.87)a

  1. Data represent the mean values with standard errors (n = 3). Different lowercase letters in the same soil depth and parameter shown after the values indicate significant differences (ANOVA, p < 0.05).
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