Table 1 Distribution of soil mechanical stability aggregate size fractions (percentage) under different cropping systems.

From: Soil aggregates stability and storage of soil organic carbon respond to cropping systems on Black Soils of Northeast China

Treatments

Aggregate size (percentage)

MSA>5 mm

MSA2-5 mm

MSA1-2 mm

MSA0.5-1 mm

MSA0.25-0.5 mm

MSA0.106-0.25 mm

MSA<0.106 mm

CC

45.02 ± 0.52 b

18.46 ± 0.32 d

11.70 ± 0.11 bc

15.01 ± 0.21 b

5.84 ± 0.05 b

2.07 ± 0.04 b

1.90 ± 0.04 a

SC

35.42 ± 0.48 c

21.91 ± 0.27 bc

13.58 ± 0.15 ab

17.44 ± 0.19 a

6.49 ± 0.07 a

2.92 ± 0.03 a

2.26 ± 0.07 a

CS

43.58 ± 0.67 b

20.31 ± 0.22 c

12.38 ± 0.13 bc

14.20 ± 0.08 b

5.31 ± 0.08 c

2.02 ± 0.02 b

2.20 ± 0.06 a

FC

34.68 ± 0.41 c

24.82 ± 0.16 a

14.63 ± 0.18 a

15.98 ± 0.18 ab

5.58 ± 0.06 bc

2.26 ± 0.03 b

2.06 ± 0.05 a

FS

50.22 ± 1.03 a

23.16 ± 0.18 ab

11.02 ± 0.09 c

11.81 ± 0.15 c

1.86 ± 0.03 d

0.76 ± 0.01 c

1.16 ± 0.02 b

  1. Note: CC, SC, CS, FC, and FS represent continuous corn, soybean-corn rotation, corn-soybean rotation, fallow-corn, and fallow-soybean treatments. MSA indicates mechanical stability aggregate. MSA>5 mm, MSA2-5 mm, MSA1-2 mm, MSA0.5-1 mm, MSA0.25-0.5 mm, MSA0.106-0.25 mm and MSA<0.106 mm represent > 5 mm, 2–5 mm, 1–2 mm, 0.5–1 mm, 0.25–0.5 mm, 0.106–0.25 mm and <0.106 mm aggregate fractions in mechanical stability aggregate. Values are given as mean ± standard error (n = 9). Mean value ± SE in the same column followed by the different lowercase letters indicate significant differences among different treatments for each size of soil aggregates (L.S.D. test, P < 0.05).
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