Dry and wet N deposition fluxes at SDS and TFS from September 2009 to August 2010.

a<p>N_d and N_w denote N dry and wet deposition, respectively; full names of other Nr species are listed in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0067018#pone-0067018-t001" target="_blank">Table 1</a>;</p>b<p>“µg N m^−3″ denotes the unit of atmospheric concentration for NH₃, NO₂, pHN₄⁺, pNO₃⁻ and HNO₃ and “g N m⁻³” denotes the concentration unit for NH₄-N and NO₃-N in precipitation;</p>c<p>s.e. denotes standard deviation of means;</p>d<p>Taken from Zhang et al. (2004). Due to the lack of measurements of HNO₃ at SDS in this study, as a first estimation we assume the same HNO₃ concentration at SDS as at TFS.