Solar Ultraviolet Radiation as an Ecological Factor for Alpine Plants

OF NATURAL SOLAR ULTRAVIOLET RADIATION ... 253 Introduction: Plant Responses to Solar Ultraviolet Radiation . 253 Effect of Solar Ultraviolet Radiation Exclusion on the Alpine Plant in Its Natural Habitat 254 Microenvironment Beneath the Test and Control Filters 254 Leaf Elongation, Shoot Yield, and Change in Area Cover 255 Frequency of Flowering . . 256 Effect of an Abrupt Change in the Ultraviolet Radiation Regime . . 258 Conclusions Concerning the Removal of UV on the Tundra . .258

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