Responses of ground vegetation to prolonged simulated acid rain in sub-arctic pine-birch forest

acid deposition acide nitrique acide sulfurique acido nitrico arbuste arbustos arctic tundra betula tortuosa canopy cladonia comportamiento sexual comportement sexuel couvert cubierta de copas empetrum empetrum nigrum lichen lichenes nitric acid pinus sylvestris sexual behaviour sexual reproduction shrubs sulphuric acid toundra toundra arctique tundra tundra artica vaccinium vaccinium vitis idaea vegetation