%0 Research article
%T Short-term impacts of nitrogen fertilization on the cover of vascular plant and bryophyte species in boreal Scots pine and Norway spruce stands
%A Männistö, Elisa
%A Jetsonen, Johanna
%A Peltola, Heli
%A Rouvinen, Teemu
%A Launiainen, Samuli
%A Laurén, Annamari
%A Palviainen, Marjo
%D 2026
%J Silva Fennica
%V 60
%N 2
%R doi:10.14214/sf.25052
%U https://silvafennica.fi/article/25052
%X Nitrogen (N) fertilization increases carbon sequestration and wood production in boreal upland forests and thus supports climate change mitigation. Excess N may, however, alter the cover, biomass and biodiversity of the ground vegetation. But little is known about how the species composition and cover are affected by the different intensities of N fertilization. Here, we evaluated the short-term impacts of N fertilization on the cover of vascular plant and bryophyte species in two Scots pine (<i>Pinus sylvestris</i> L.) -dominated and two Norway spruce (<i>Picea abies</i> (L.) H. Karst.) -dominated stands in Eastern Finland. The fertilization was done using a forwarder in the Scots pine stands and a helicopter in the Norway spruce stands, which are typical vehicles for this work in practical forestry. Funnel traps were used to measure the applied N doses at the plot level. Each study site also included unfertilized control plots. The percentage cover of vascular plant and bryophyte species was estimated at the beginning of the experiment, and then twice within 2–4 years after the fertilization. Overall, N fertilization had no significant impact on the cover of any vascular plant or bryophyte species. The cover of many species also decreased over the years, both in the fertilized and unfertilized plots. The exceptionally warm and dry summer of 2021 may have contributed to this result. However, further studies are needed to evaluate long-term responses in the ground cover and species composition to the N fertilizer doses used in practical forestry.