[Inorganic N deposition in the Bayinbuluk alpine grassland of the central Tianshan mountains].

N deposition has increased significantly with economic development and intensive human activities in China and has affected natural ecosystems in remote areas. To evaluate the atmospheric N deposition of the Bayinbuluk alpine grassland of the central Tianshan Mountains, the dry and wet N depositions were monitored from May 2010 to December 2011. Fluxes of HNO3, NH3, NO2, particulate ammonium and nitrate (pNH4+ and pNO3-) averaged at 1.47, 0.68, 0.13, 0.23 and 0.25 kg N x hm(-2) x a(-1), respectively. Wet depositions of NH(4+)-N and NO(3-)-N were 2.47 and 1.59 kg N x hm(-2) x a(-1), respectively. Total atmospheric inorganic N deposition fluxes averaged at 6.82 kg N x hm(-2) x a(-1), and the wet and dry depositions were 4.06 and 2.76 kg N x hm(-2) x a(-1), respectively. Nitrogen deposition fluxes showed a significant seasonal change, with 72.1% of dry N deposition occurring in spring and summer, and 78.3% of wet N deposition concentrating in summer and autumn.