Table 3.
Leaf nutrient composition, stable carbon (δ13C) and nitrogen (δ15N) isotope composition of switchgrass exposed to ambient and elevated O3 in 2018. Data are presented as means ± SE (n = 3). Significant differences between ambient and elevated O3 are indicated by different letters.
| Ambient O3 | Elevated O3 | |
|---|---|---|
| Mg (mg kg−1) | 5079.1 ± 229.8 (a) | 5617.5 ± 285.2 (a) |
| P (mg kg−1) | 2466.8 ± 65.9 (a) | 2732.1 ± 146.9 (a) |
| S (mg kg−1) | 2326.0 ± 77.0 (a) | 2316.1 ± 86.1 (a) |
| K (mg kg−1) | 18695.6 ± 737.5 (a) | 16245.0 ± 688.3 (b) |
| Ca (mg kg−1) | 5994.7 ± 387.8 (a) | 7590.4 ± 685.4 (a) |
| B (mg kg−1) | 3.43 ± 0.10 (a) | 3.71 ± 0.086 (a) |
| Mn (mg kg−1) | 65.1 ± 10.7 (a) | 52.5 ± 9.91 (a) |
| Fe (mg kg−1) | 459.7 ± 61.1 (a) | 457.2 ± 43.2 (a) |
| Ni (mg kg-1) | 3.18 ± 0.26 (a) | 2.80 ± 0.23 (a) |
| Cu (mg kg−1) | 9.78 ± 0.43 (a) | 9.07 ± 0.33 (a) |
| Zn (mg kg−1) | 27.6 ± 2.18 (a) | 27.4 ± 2.21 (a) |
| Mo (mg kg−1) | 1.17 ± 0.069 (a) | 1.27 ± 0.24 (a) |
| Na (mg kg−1) | 106.3 ± 11.5 (a) | 142.7 ± 23.5 (a) |
| V (mg kg−1) | 0.36 ± 0.021 (a) | 0.36 ± 0.014 (a) |
| Co (mg kg−1) | 0.13 ± 0.012 (a) | 0.11 ± 0.0080 (a) |
| δ13C (‰) | −12.22 ± 0.060 (a) | −12.49 ± 0.080 (b) |
| δ15N (‰) | 4.04 ± 0.46 (a) | 5.35 ± 0.78 (a) |