title: Effects of nitrogen additions on biomass, stoichiometry and nutrient pools of moss Rhytidium rugosum in a boreal forest in Northeast China.
abstract: 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.
authors.affiliation: Department of Ecology, College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China.
authors.forename: Enzai
authors.initials: E
authors.lastname: Du
authors.affiliation: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
authors.forename: Xiuyuan
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Ecology, College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China. Electronic address: jyfang@urban.pku.edu.cn.
authors.forename: Jingyun
authors.initials: J
authors.lastname: Fang
mesh_terms: D018533:Biomass; D019068:Bryopsida / Q000187:drug effects*; D002244:Carbon / Q000378:metabolism; D002681:China; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis* / Q000633:toxicity; D009584:Nitrogen / Q000032:analysis* / Q000633:toxicity; D010758:Phosphorus / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects*; D014197:Trees
chemical_list: D004785:Environmental Pollutants; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen
keywords: Boreal forest; Carbon pool; Moss; N:P ratio; Nitrogen deposition