Differences in the growth response of three bryophyte species to nitrogen |
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Authors: | Salemaa Maija Mäkipää Raisa Oksanen Jari |
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Institution: | a Finnish Forest Research Institute, Vantaa Research Unit, P.O. Box 18, FI-01301 Vantaa, Finland b University of Oulu, Department of Biology, P.O. Box 3000, FI-90014 Oulu, Finland |
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Abstract: | The effect of nitrogen on biomass production, shoot elongation and relative density of the mosses Pleurozium schreberi, Hylocomium splendens and Dicranum polysetum was studied in a chamber experiment. Monocultures were exposed to 10 N levels ranging from 0.02 to 7.35 g N m−2 during a 90-day period. All the growth responses were unimodal, but the species showed differences in the shape parameters of the curves. Hylocomium and Pleurozium achieved optimum biomass production at a lower N level than Dicranum. Pleurozium had the highest biomass production per tissue N concentration. Tolerance to N was the widest in Dicranum, whereas Hylocomium had the narrowest tolerance. Dicranum retained N less efficiently from precipitation than the other two species, which explained its deviating response. All species translocated some N from parent to new shoots. The results emphasize that the individual responses of bryophytes to N should be known when species are used as bioindicators. |
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Keywords: | Biomass production Boreal vegetation Nitrogen deposition Nutrient uptake Fundamental niche |
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