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Table 2 Effects of aggregate sizes (> 2, 2–1, 1–0.25, and < 0.25 mm) and stand ages (0, 9, 17, and 26 years old) on the soil aggregate composition in a chronosequence of Chinese fir plantations

From: Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Stand age (years)

Soil aggregate composition (%)

Effects

> 2 mm

2–1 mm

1–0.25 mm

< 0.25 mm

Aggregate size (A),

df = 3

Stand age (S),

df = 3

A × S,

df= 9

F

P

F

P

F

P

0

47.28 ± 1.11 c

17.33 ± 0.82 a

7.34 ± 0.57 a

28.05 ± 0.64 b

1249.508

< 0.0001

40.037

< 0.0001

37.026

< 0.0001

9

52.31 ± 1.51 b

18.47 ± 0.84 a

5.24 ± 0.52 a

23.98 ± 1.94 c

      

17

61.02 ± 1.15 a

16.02 ± 0.88 a

6.89 ± 1.06 a

16.07 ± 1.73 d

      

26

42.28 ± 1.17 d

17.33 ± 0.41 a

7.41 ± 1.07 a

32.98 ± 0.72 a

      

Mean

51.90 ± 2.22 A

16.79 ± 0.40 C

6.88 ± 0.45 D

24.85 ± 2.15 B

      
  1. Data represent the average of 3 replicates ± standard errors. Different lowercase letters indicate significant differences among the different stand ages. Different capital letters indicate significant differences among the different aggregate sizes