Table 1.
Ash, total sodium, potassium, calcium, magnesium and zinc, and C/N ratio for leaves and roots of Spartina densiflora in response to a treatment with a range of salinity concentrations at ambient and elevated [CO2] over 90 d
| [CO2] (ppm) | 380 | |||||
| Tissue | Leaves | Roots | ||||
| Salinity (mM) | 0 | 171 | 510 | 0 | 171 | 510 |
| Ash (%) | 13.4 (0.03) a | 15.8 (0.13) b | 15.4 (0.02) b | 19.0 (0.22) c | 19.4 (0.39) c | 23.8 (0.43) d |
| Na (mg g−1) | 8.5 (0.10) a | 31.9 (0.10) b | 47.4 (0.27) c | 5.5 (0.04) de | 23.8 (0.05) f | 38.2 (0.22) g |
| K (mg g−1) | 53.8 (1.24) a | 24.8 (0.62) b | 14.7 (0.12) c | 41.6 (0.17) e | 37.7 (0.30) ef | 50.1 (0.58) a |
| Ca (mg g−1) | 7.9 (0.05) a | 6.2 (0.02) b | 3.8 (0.00) c | 3.8 (0.02) c | 2.1 (0.00) d | 1.7 (0.00) e |
| Mg (mg g−1) | 3.6 (0.02) a | 4.1 (0.01) b | 2.0 (0.01) c | 6.1 (0.03) d | 5.2 (0.01) e | 2.2 (0.00) f |
| Zn (mg kg−1) | 40.7 (0.93) a | 30.9 (0.56) b | 41.8 (0.23) ac | 44.2 (0.56) c | 40.0 (0.26) a | 87.7 (1.24) d |
| C/N | 15.3 (0.05) a | 17.6 (0.00) b | 17.1 (0.10) b | 10.0 (0.02) c | 14.1 (0.23) d | 16.4 (0.30) e |
| [CO2] (ppm) | 700 | |||||
| Tissue | Leaves | Roots | ||||
| Salinity (mM) | 0 | 171 | 510 | 0 | 171 | 510 |
| Ash (%) | 11.3 (0.05) e | 15.4 (0.15) b | 16.9 (0.27) b | 11.3 (0.36) e | 12.9 (0.42) f | 21.2 (0.48) g |
| Na (mg g−1) | 6.3 (0.02) d | 36.3 (0.29) h | 47.8 (0.64) c | 5.4 (0.05) de | 23.6 (0.42) f | 44.5 (0.40) i |
| K (mg g−1) | 32.8 (0.62) fg | 17.4 (0.16) cd | 10.6 (0.15) c | 30.3 (0.87) g | 19.6 (0.36) d | 25.4 (0.23) b |
| Ca (mg g−1) | 6.7 (0.00) f | 5.0 (0.00) g | 4.2 (0.00) h | 2.6 (0.00) i | 1.5 (0.00) j | 1.2 (0.00) k |
| Mg (mg g−1) | 2.7 (0.03) g | 3.7 (0.04) a | 2.5 (0.02) h | 3.7 (0.05) a | 3.9 (0.03) b | 2.9 (0.02) i |
| Zn (mg kg−1) | 20.2 (0.04) e | 21.6 (0.07) e | 28.4 (0.14) bf | 16.9 (0.23) g | 17.0 (0.07) g | 28.9 (0.16) bf |
| C/N | 16.0 (0.05) e | 16.3 (0.12) e | 16.4 (0.05) e | 12.9 (0.08) f | 16.2 (0.00) e | 14.2 (0.11) d |
Values represent mean ±SE, n=3. Different letters indicate means that are significantly different from each other (three-way ANOVA, CO2×salinity×tissue; Tukey test, P <0.05).