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Plant greenness (%) measured by optical system analysis for seedlings of Picea abies (A), Pinus sylvestris (B), Fagus sylvatica (C) and Quercus ilex (D). Data refer to each sampling date after germination and are represented as means (n = 52) ± 1 SE. Lowercase letters indicate statistically significant difference (p < 0.05) between each sampling date.
