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- W2043955223 abstract "Cuttings of Norway spruce, Picea abies (L.) Karst., were planted under two Scots pine, Pinus sylvestris L., shelterwoods with a density gradient varying from fully stocked forest to clearcuts. This provided a range of near-ground temperature and radiation regimes. The microclimate was monitored near each cutting, using an automated mobile system. The factors monitored were air temperature, global radiation, and net radiation. Frost damage to the spruce cuttings was assessed by two methods. First, the percentage of actively growing shoots with visible damage was determined. Second, the maximum photochemical efficiency of photosystem II (F v /F m ) in 1-year-old and current-year needles was estimated from measurements of chlorophyll a fluorescence. A frost event in May 1990 was analysed using the partial least squares in latent variables (PLS) method of multivariate statistical analysis. Different microclimatic variables were used as predictors. Visible damage to actively growing shoots and the F v /F m ratio in 1-year-old needles were used as response variables. The predictors were used to produce a separate PLS model for each response variable. Nocturnal net radiation during the frost event, and both the net and global radiation the day after, were found to be important for explaining the visible damage and the F v /F m ratios. In both the PLS analyses, the modelling power of these three variables was ranked among the highest of all microclimatic factors tested. The accumulated air temperature below 0°C, the duration of the frost, and the minimum air temperature near the ground (at 0.4 m) also had high predictive power. Thus, both higher nocturnal air temperature near the ground and shading the day after the frost event were important factors explaining the reduction of visible damage and low-temperature induced photoinhibition. Leaving a dense shelterwood moderates both the nocturnal air temperature and the radiation regime and, therefore, is recommended on sites where early summer frosts are expected." @default.
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- W2043955223 date "2001-01-01" @default.
- W2043955223 modified "2023-10-16" @default.
- W2043955223 title "Effects of pine shelterwoods on microclimate and frost damage to Norway spruce seedlings" @default.
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- W2043955223 doi "https://doi.org/10.1139/x00-149" @default.
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