Drought and freezing vulnerability of the isolated hybrid aspen Populus x smithii relative to its parental species P. tremuloides and P. grandidentata

摘要

AimWe assessed the vulnerability of an isolated, relictual Pleistocene hybrid aspen population of conservation interest (Populus x. smithii) and the nearest populations of its parent species (Populus grandidentata and Populus tremuloides) to springtime post‐bud break freezing and growing season drought stress. Response to these stressors in the three taxa was compared in terms of avoidance and tolerance.