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Changes in paddy soil pH in the 0–20 cm layer from 1980 to 2010 in China.
| Region | Soil pH 1980s | Soil pH 2010s | Soil Acidification Rate from 1980s to 2010s (pH Unit/a) |
|---|---|---|---|
| Northeast China | 6.41 ± 0.0074 * | 6.07 ± 0.1856 | 0.0163 ± 0.0006 |
| Middle and lower Yangtze River | 5.99 ± 0.0044 | 5.70 ± 0.0243 | 0.0006 ± 0.0002 |
| Southwest China | 6.15 ± 0.0046 | 6.29 ± 0.0331 | −0.0028 ± 0.0004 |
| Southern China | 5.93 ± 0.0040 | 5.35 ± 0.0243 | 0.0078 ± 0.0003 |
* Data represent the mean value ± standard error.
