title: [Dynamics of nitrogen and sulfur wet deposition in typical forest stand at different spatial levels in Simian Mountain, mid-subtropical region].
abstract: In order to investigate the dynamics of nitrogen and sulfur wet deposition in subtropical forest ecosystem, one typical forest stand, evergreen broad-leaved forest, at Simian Mountain located in Chongqing was selected in this research. Based on field monitoring, effects of precipitation, throughfall, litterfall, and groundwater runoff of the typical forest stand on the quality of water of Simian Mountain were investigated from September 2012 to August 2013. Results showed that the rainfall of Simian Mountain was apparently acidic, with average pH of 4.89 and maximum pH of 5.14. The soil, canopies and trunks could increase pH of precipitation, with soils having the maximum increment, followed by the forest canopy. Forest canopy had the function of adsorption and purification of NO3-, NO2- and SO4(2-), and the average entrapment rate was 56.68%, 45.84% and 35.51%, respectively. Moreover, the degradation of litter was probably the main reason for the increase of ion concentrations in the surface litter water. Forest soils could absorb and neutralize NO3-, SO2- and NH4+, and release NO2-. The evergreen broad-leaf forest of mid-subtropical region had the function of interception on NO3-, NO2-, NH4+ and SO4(2-), and the total entrapment rate was 92.86%, 57.86%, 87.24% and 87.25%, respectively, and it had a certain buffering function for the acid rain.
authors.forename: Tao
authors.initials: T
authors.lastname: Sun
authors.forename: Ming
authors.initials: M
authors.lastname: Ma
authors.forename: Ding-yong
authors.initials: DY
authors.lastname: Wang
authors.forename: Li-xin
authors.initials: LX
authors.lastname: Huang
mesh_terms: D015258:Acid Rain; D002681:China; D065928:Forests; D009584:Nitrogen / Q000032:analysis*; D012987:Soil / Q000737:chemistry; D062206:Spatial Analysis; D013455:Sulfur / Q000032:analysis*; D014197:Trees; D014867:Water
chemical_list: D015258:Acid Rain; D012987:Soil; D014867:Water; D013455:Sulfur; D009584:Nitrogen