Experimental studies on Vaccinium myrtillus and Vaccinium vitis-idaea in relation to air pollution and global change at northern high latitudes: A review

The aim of this paper is to review the experimental studies performed with two important species (i.e. Vaccinium myrtillus and Vaccinium vitis-idaea) of the shrub layer of boreal forests. The focus is on ecophysiology and stress tolerance under conditions of air pollution and global change. Our objective was to make an overview of studies of abiotic stress related to global change on the above species, and discuss the reported effects of these environmental factors. These issues include nitrogen, heavy metals, radionuclides, salt, ozone, carbon dioxide, warming climate, declining snow cover, periodic droughts, fire and elevated UV radiation. The findings suggest that both species are relatively tolerant to many abiotic environmental stresses: increased nitrogen and metal supply have negligible impacts on these species, as the atmospheric gaseous compounds reported. In some cases the effects are even positive, since extra nitrogen may improve the frost hardiness of V. vitis-idaea, and V. myrtillus may even benefit from elevated CO2. Both species also seem to recover well from fires. However, the reports demonstrated that both have species-specific areas of weakness: (1) V. myrtillus is susceptible to stress caused by warming winter, and (2) frost hardiness of V. vitis-idaea may be reduced under enhanced UV radiation.

► Two boreal dwarf shrub species are reviewed from environmental and experimental perspectives. ► Review focused on the aspects related to air pollution and global change these species (Vaccinium myrtillus; V. vitis-idaea). ► Both species appear to be relatively tolerant against various forms of stress, while both seem exhibit special sensitiveness.