Table 3 Amounts of cations released from purple rock under various pH weathering conditions.

From: Acidic condition accelerates cation release from purple rock in Southwestern China

Rock types

pH

Amount of cations released (mmol kg-1)

K+

Na+

Ca2+

Mg2+

J2s

2.5

0.61 ± 0.03a

3.19 ± 0.21a

10.43 ± 0.20a

6.12 ± 0.05a

3.5

0.29 ± 0.02b

2.09 ± 0.13b

1.30 ± 0.03b

0.62 ± 0.03b

4.5

0.26 ± 0.01c

1.78 ± 0.14c

1.05 ± 0.05c

0.39 ± 0.02c

5.6

0.20 ± 0.01d

1.49 ± 0.14d

0.97 ± 0.03c

0.36 ± 0.01c

CK

0.18 ± 0.01de

1.15 ± 0.07e

0.84 ± 0.02d

0.30 ± 0.02d

J3p

2.5

0.76 ± 0.02a

2.37 ± 0.28a

22.08 ± 0.25a

1.46 ± 0.05a

3.5

0.40 ± 0.01b

1.77 ± 0.17b

3.82 ± 0.05b

0.35 ± 0.01b

4.5

0.33 ± 0.01c

1.49 ± 0.14bc

2.97 ± 0.02c

0.32 ± 0.01bc

5.6

0.32 ± 0.04c

1.33 ± 0.15cd

2.72 ± 0.03d

0.29 ± 0.01cd

CK

0.30 ± 0.03c

1.05 ± 0.11e

2.49 ± 0.05e

0.26 ± 0.01e

  1. Different letters in a column indicate significant differences between the treatments, where P < 0.05.
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