Table 3.
Basic cation concentrations in leaves of roadside trees (mg 100 g−1).
| Cation | Index of leaf injury | R (n = 70) | ||||||
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | ||
| K+ | 1618 (155) | 1335 (353) | 1265 (171) | 1001 (83) | 1036 (93) | 873 (104) | 125 (53) | − 0.86 |
| Mg2+ | 178 (43) | 200 (43) | 201 (67) | 166 (19) | 143 (52) | 129 (4) | 124 (53) | − 0.61 |
| Ca2+ | 1331 (143) | 2135 (1262) | 1711 (1429) | 1345 (1056) | 1761 (548) | 1072 (609) | 1107 (709) | n.s. |
Correlation between cation concentrations and leaf injury index (Spearman correlation coefficient, p < 0.001).
Values are median and IQR in parentheses (n = 10 per leaf damage severity).