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Shading reduces both visible and invisible frost damage to Norway spruce seedlings in the field

, : Shading reduces both visible and invisible frost damage to Norway spruce seedlings in the field. Forestry (Oxford) 66(1): 27-36

Two-year-old cuttings of Norway spruce were subjected to night frosts in spring on an exposed site in southern Sweden. Shading was used to assess the influence of sunlight on the extent of damage resulting from night frost. Chlorophyll fluorescence was measured in needles in flushing shoots, and in shoots at the stage of bud burst. The F-v:F-m ratio was significantly lower for plants exposed to light, compared with shaded plants on the days following the night frost (minimum temperature -6 degree C). The effect was similar both in 1-year-old and current year needles. The low F-v:F-m ratios indicate damage to photosystem II, caused by an interaction between subfreezing temperatures and high light intensity. Shading also increased the survival of flushing shoots. It is suggested that regeneration of Norway spruce on sites exposed to frost should be carried out in partial shade, for example under a shelterwood.


DOI: 10.1093/forestry/66.1.27

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