Table S2.

Characteristics of the most stressors-tolerant and stressors-intolerant trees as indicated by the participants in the Delphi survey.

Air pollutionGood health, thick leavesThin leaves
De-icing saltsWaxy leaves, tolerance to soil compaction and droughtConifers, shallow roots, thin bark, require moist and well-drained soils, planted without protection or protocol
DroughtSoil-compaction tolerance, deep roots, waxy cuticles, good health, native species from drought-stressed places, salt tolerance, good water-storage capacityShallow roots
Extreme temperaturesDeep roots, waxy surfaces, leaf pubescence, regulation of water loss, old ageShade tolerance
Ice stormsDense wood, good structure, strong attachments, decay free, flexible branchesPoor structure, narrow branch unions, evergreen, bark inclusions (or “ingrown” bark), weak wood, fast growth, wide crown
Insects and diseasesGood health, adaptation to different environmental conditionsNo agreement
SnowDeciduous, dense wood, good health, decay free, early defoliation, flexibility in the limbs, good structureDeciduous, poor structure, weak attachments, weak wood, late defoliation, wide branches, fast growth
Soil compactionSeasonal-flooding tolerance, drought tolerance, hard wood, native species from wetland sitesDrought intolerance, slow growth
Strong windsGood structure, deep roots, stable rooting, slow growth, dense wood, good healthPoor structure, shallow roots, dense crown, weak roots, fast growth