Table 2.
Soil water-soluble organic carbon (WSOC) (mg kg−1) in rubber and rubber–Flemingia macrophylla plantations from June 2015 to January 2017 (mean ± SD, n = 3).
| Soil depth (cm) | Treatments | Jun 2015 | Jan 2016 | Aug 2016 | Jan 2017 |
|---|---|---|---|---|---|
| 0–10 cm | R1 | 70.7 ± 3.7b | 78.3 ± 1.0a | 67.5 ± 2.2b | 67.7 ± 6.7b |
| RF1 | 72.3 ± 1.9b | 86.0 ± 5.5a | 84.9 ± 7.0a | 80.5 ± 7.8a | |
| R2 | 84.5 ± 6.1a | 86.6 ± 10.1a | 75.1 ± 5.0ab | 50.1 ± 4.4d | |
| RF2 | 82.5 ± 1.7a | 80.5 ± 2.7a | 76.9 ± 6.2ab | 57.7 ± 8.0bcd | |
| 10–30 cm | R1 | 71.2 ± 5.5b | 80.7 ± 8.4a | 72.8 ± 8.0b | 66.1 ± 1.5b |
| RF1 | 70.7 ± 7.3b | 82.5 ± 4.2a | 75.6 ± 7.1ab | 63.2 ± 8.7bc | |
| R2 | 88.8 ± 3.4a | 82.3 ± 8.2a | 75.3 ± 4.6ab | 50.4 ± 6.0d | |
| RF2 | 85.9 ± 2.3a | 87.8 ± 14.8a | 70.6 ± 7.7b | 55.0 ± 1.2 cd |
R1: rubber plantations established in 2006; R2: rubber plantations established in 1994; RF1: Flemingia macrophylla introduced to R1 in 2010; RF2: The Flemingia macrophylla introduced to R2 in 2010. Values within a column followed by the same letter do not differ significantly at P ≤ 0.05.