Inorganic N of Atmospheric Wet Deposition From A Typical Agro-Ecosystem In Southeast China During Rainy Season

Atmospheric N (N) deposition, especially for atmospheric wet deposition has led to changes in agroecosystems from N limited to N saturated. Rained agriculture is weather dependent, and in turn the impact of the vagaries of the rainy rainfall on food production has been of great concern. In this paper, rainy season was determined and characteristics of wet-deposition N, including NH+4-N and NO-3 -N was done by rainfall and N concentration in rainwater at Red Soil Ecological Experiment Station, Chinese Academy of Sciences (116°55́E, 28°12́N), a typical red soil agro-ecosystem, located in Yingtan city, Jiangxi province, Southeastern China during the rainy season in 2003, 2005 and 2008. The deposition fluxes of NH+4-N and NO-3-N in the rainy season was in the range of 4.93-7.75 and 1.19-2.51 kg ha-1, respectively. The inorganic N (NH+4-N plus NO-3-N) deposition flux varied from 6.12-10.26 kg ha-1, which was equivalent to 14.57-24.43 kg ha-1 urea or 34.53-57.90 kg ha-1 ammonium bicarbonate applied in the red soil agro-ecosystem. So, the N input of wet deposition during the rainy season could not be neglected in farmland ecosystem. And it is worth considering of reducing N application rate in the red soil farmland.