title: Monitoring nitrogen deposition in typical forest ecosystems along a large transect in China.
abstract: The nitrogen (N) deposition fluxes were investigated in eight typical forest ecosystems along the North-South Transect of Eastern China (NSTEC; based on the ChinaFLUX network) by ion-exchange resin (IER) columns from May 2008 to April 2009. Our results demonstrated that the method of IER columns was both labor cost saving and reliable for measuring dissolved inorganic nitrogen (DIN) deposition at the remote forest stations. The deposition of DIN in the throughfall ranged from 1.3 to 29.5 kg N ha(-1) a(-1), increasing from north to south along NSTEC. The relatively high average ratio of ammonium to nitrate in deposition (1.83) indicated that the N deposition along the NSTEC in China mostly originated in farming and animal husbandry rather than in industry and vehicle activities. For seasonal variability, the DIN deposition showed a single peak in the growing season in the northern part of NSTEC, while, in the southern part, it exhibited double-peaks in the early spring and the mid-summer, respectively. On the annual scale, the DIN deposition variations of the eight sites could be mainly explained by precipitation and the distances from forest stations to provincial capital cities.
authors.affiliation: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, People's Republic of China.
authors.forename: Wenping
authors.initials: W
authors.lastname: Sheng
authors.forename: Guirui
authors.initials: G
authors.lastname: Yu
authors.forename: Chunming
authors.initials: C
authors.lastname: Jiang
authors.forename: Junhua
authors.initials: J
authors.lastname: Yan
authors.forename: Yunfen
authors.initials: Y
authors.lastname: Liu
authors.forename: Silong
authors.initials: S
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: Junhui
authors.initials: J
authors.lastname: Zhang
authors.forename: Chuankuan
authors.initials: C
authors.lastname: Wang
authors.forename: Mei
authors.initials: M
authors.lastname: Zhou
authors.forename: Bingrui
authors.initials: B
authors.lastname: Jia
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D009584:Nitrogen / Q000032:analysis*; D014197:Trees
chemical_list: D000393:Air Pollutants; D009584:Nitrogen