Comparison of assessment criteria for eighty fallen urban trees compared to fifteen wind-thrown forest trees.
| Criterion | Forest trees positive for criterion (%) | Urban trees positive for criterion (%) |
|---|---|---|
| Evidence of the loss of descending (sinker or vertical) roots | 100 | 88.8 |
| Significant damage and/or decay to exposed lateral roots | 40 | 87.5 |
| Evidence of soil compaction in immediate vicinity of the trunk | 0 | 65.0 |
| Indicators of waterlogging in immediate vicinity of the trunk | 66.6 | 56.3 |
| Evidence of site or trenching works within four meters of trunk | 0 | 58.8 |
| Presence of fill around base of tree | 0 | 37.5 |
| Canopy dieback and deadwood | 80 | 32.5 |