title: Responses of CH(4), CO(2) and N(2)O fluxes to increasing nitrogen deposition in alpine grassland of the Tianshan Mountains.
abstract: To assess the effects of nitrogen (N) deposition on greenhouse gas (GHG) fluxes in alpine grassland of the Tianshan Mountains in central Asia, CH(4), CO(2) and N(2)O fluxes were measured from June 2010 to May 2011. Nitrogen deposition tended to significantly increase CH(4) uptake, CO(2) and N(2)O emissions at sites receiving N addition compared with those at site without N addition during the growing season, but no significant differences were found for all sites outside the growing season. Air temperature, soil temperature and water content were the important factors that influence CO(2) and N(2)O emissions at year-round scale, indicating that increased temperature and precipitation in the future will exert greater impacts on CO(2) and N(2)O emissions in the alpine grassland. In addition, plant coverage in July was also positively correlated with CO(2) and N(2)O emissions under elevated N deposition rates. The present study will deepen our understanding of N deposition impacts on GHG balance in the alpine grassland ecosystem, and help us assess the global N effects, parameterize Earth System models and inform decision makers.
authors.affiliation: Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
authors.forename: Kaihui
authors.initials: K
authors.lastname: Li
authors.forename: Yanming
authors.initials: Y
authors.lastname: Gong
authors.forename: Wei
authors.initials: W
authors.lastname: Song
authors.forename: Guixiang
authors.initials: G
authors.lastname: He
authors.forename: Yukun
authors.initials: Y
authors.lastname: Hu
authors.forename: Changyan
authors.initials: C
authors.lastname: Tian
authors.forename: Xuejun
authors.initials: X
authors.lastname: Liu
mesh_terms: D001209:Asia, Central; D002245:Carbon Dioxide / Q000032:analysis*; D005740:Gases / Q000032:analysis*; D017752:Greenhouse Effect; D008697:Methane / Q000032:analysis*; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism*; D009609:Nitrous Oxide / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D005740:Gases; D012987:Soil; D014867:Water; D002245:Carbon Dioxide; D009609:Nitrous Oxide; D009584:Nitrogen; D008697:Methane