Table 2.
Leaf concentrations of elements and mole ratio of Si : Al and Si : Ca in ten Rubiaceae and one Melastomataceae species
| Family | Leaf concentrations (mg kg–1) | Mole ratio | |||||||
| Species | Al | Si | Mn | Fe | Zn | Cu | Ca | Si : Al | Si : Ca |
| Rubiaceae | |||||||||
| Alberta minor | 2472 | 586 | 92 | 61 | 17 | 1 | 2066 | 0·226 | 0·404 |
| Canthium confertum | 1885 | 6589 | 14 | 77 | 54 | 3 | 23 482 | 3·360 | 0·400 |
| Coccocypselum canescens | 10 357 | 6515 | 149 | 746 | 59 | 8 | 16 975 | 0·603 | 0·548 |
| Coptosapelta olaciformis | 10 535 | 3560 | 3644 | 160 | 46 | 5 | 8428 | 0·324 | 0·603 |
| Craterispermum laurinum | 36 202 | 13 438 | 587 | 391 | 33 | 18 | 11 389 | 0·356 | 1·684 |
| Danais fragrans | 9146 | 12 100 | 358 | 101 | 28 | 6 | 10 743 | 1·270 | 1·608 |
| Emmeorhiza umbellata 1 | 1222 | 22 075 | 68 | 160 | 42 | 6 | 14 214 | 17·386 | 2·216 |
| Emmeorhiza umbellata 2 | 2452 | 4812 | 24 | 250 | 32 | 5 | 15 865 | 1·886 | 0·433 |
| Gouldia terminalis | 1946 | 5118 | 892 | 57 | 39 | 2 | 24 595 | 2·526 | 0·297 |
| Saprosma arboreum | 9854 | 3571 | 737 | 50 | 41 | 3 | 15 731 | 0·347 | 0·324 |
| Triainolepis hildebrandtii | (Trace) | 5305 | 7 | 46 | 17 | 3 | 25 245 | – | 0·300 |
| Melastomataceae | |||||||||
| Melastoma malabathricum | 7130 | (Trace) | 208 | 651 | 36 | 11 | 12 143 | – | – |
Only one sample was tested for each specimen.