| Species-richness |
Total number of vascular plant, bryophyte and lichen species present. |
| Simpson’s diversity index |
1 − (sum of squared cover proportions) |
| Scarcity |
−1 × number of 10×10 km squares in the UK where the species occurs [60]. |
| Positive indicator-species |
Number of positive indicator-species present. |
| Negative indicator-species |
−1 × number of negative indicator-species present. |
| Positive minus negative indicator-species |
Number of positive indicator-species present, minus number of negative indicator-species present. |
| Species-groups (bog) |
Total cover of Sphagnum species. |
| Species-groups (heathland) |
Total cover of sub-shrubs. |
| Species-groups (grassland) |
Forb cover / total cover. |
| Maximum similarity |
Maximum Czekanowski similarity to a reference NVC subcommunity. |
| Mean similarity |
Mean Czekanowski similarity to reference NVC subcommunities. |
| Infertility indicator-score |
−1 × mean Ellenberg N score for plant species present, not cover-weighted. |
