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Global nitrogen (N) deposition has been enhanced with anthropogenic N emissions, and its impacts on mosses are receiving more and more attention. This study investigates how N deposition influence the biomass and stoichiometry of moss Rhytidium rugosum, using a 3-year N enrichment experiment with 0, 2, 5 and 10 g N m−2 yr−1 in a boreal forest in Northeast China. Low N additions caused an N redundancy and moderate to high N additions resulted in a biomass loss. N additions reduced biomass ratios of green to brown tissues and increased N and phosphorus (P) contents, suggesting changes in photosynthetic capacity and litter decomposition. Biomass N pools showed a unimodal response to the N additions, and P pools decreased under moderate and high N additions. Our findings indicate significant stoichiometric and biomass changes caused by N deposition may lead to a substantial carbon and nutrient loss in boreal moss carpets.
•Effects of N deposition on moss biomass and stoichiometry were investigated.•N deposition reduced biomass ratios of green to brown moss tissues.•N deposition increased N and P contents in moss tissues.•N deposition caused significant changes of moss carbon and nutrient pools.
Significant stoichiometric and biomass changes of mosses can be caused by N deposition and may lead to a substantial carbon and nutrient loss in boreal moss carpets.