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Long-term outdoor experiments were conducted to investigate the effects of elevated ultraviolet-B (UV-B, 280–320 nm) radiation on secondary metabolites (phenolics and terpenoids) and the main soluble sugars (sucrose, raffinose and glucose) in the bark of silver birch ( Betula pendula  Roth) saplings. Saplings were exposed to a constant 50% increase in erythemal UV irradiance (UV-B CIE ; based on the CIE (International Commission on Illumination) erythemal action spectrum) and a small increase in UV-A radiation (320–400 nm) for three growing seasons in an irradiation field in central Finland. Two control groups were used: saplings exposed to ambient radiation and saplings exposed to slightly increased UV-A radiation.

Effects of long-term, elevated ultraviolet-B radiation on phytochemicals in the bark of silver birch ( Betula pendula )