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Table 1 Effects of the wolfberry planting age on the soil physicochemical properties

From: Variations in the quantity and chemical composition of soil dissolved organic matter along a chronosequence of wolfberry plantations in an arid area of Northwest China

Parameters

Planting age (y)

0

1

4

6

10

13

SOM (g·kg−1)

23.54 ± 1.72 bc

21.45 ± 4.01 bc

21.15 ± 1.15 c

21.54 ± 1.94 bc

25.48 ± 1.51 b

30.07 ± 0.93 a

pH

8.11 ± 0.03 a

8.16 ± 0.03 a

8.12 ± 0.06 a

8.18 ± 0.01 a

8.16 ± 0.03 a

8.22 ± 0.03 a

AP (mg·kg−1)

118.6 ± 22.41 bc

100.9 ± 8.32 bc

98.23 ± 4.70 c

121.3 ± 2.40 bc

147.9 ± 12.70 a

123.57 ± 12.43b

TN (g·kg−1)

1.32 ± 0.13 b

1.17 ± 0.23 b

1.19 ± 0.09 b

1.23 ± 0.15 b

1.43 ± 0.06 b

1.67 ± 0.03 a

C/N

10.34 ± 0.33 a

10.62 ± 0.20 a

10.32 ± 0.19 a

10.21 ± 0.36 a

10.35 ± 0.22 a

10.46 ± 0.15 a

TEB (coml·m−2)

27.22 ± 0.47 a

25.91 ± 0.47 b

25.7 ± 0.85 bc

25.27 ± 0.12 bc

25.26 ± 0.17 bc

24.99 ± 0.37 c

K+ (coml·m−2)

0.65 ± 0.05 a

0.57 ± 0.08 ab

0.53 ± 0.07 b

0.5 ± 0.04 b

0.51 ± 0.05 b

0.47 ± 0.05 b

Ca2+ (coml·m−2)

23.08 ± 0.41 a

21.73 ± 0.24 b

21.58 ± 0.09 b

21.43 ± 0.63 b

21.14 ± 0.24 b

21.03 ± 0.33 b

Na+ (coml·m−2)

1.11 ± 0.20 a

0.94 ± 0.08 ab

0.89 ± 0.03 ab

0.84 ± 0.22 ab

0.83 ± 0.15 b

0.74 ± 0.03 b

Mg2+ (coml·m−2)

2.86 ± 0.03 a

2.84 ± 0.07 a

2.68 ± 0.01 b

2.49 ± 0.05 c

2.45 ± 0.06 c

2.44 ± 0.06 c

  1. Different lower-case letters indicate significant differences between the wolfberry planting age (P < 0.05)