Quantitative Input of Atmospheric Nitrogen to an Agro-ecosystem in a Typical Red Soil Region
大气氮沉降向典型红壤区农田生态系统定量输入研究

The atmospheric nitrogen (N) deposition flux and dry deposition N velocities (Vd) were estimated using big leaf resistance analogy model by observations of onflow and factors of farmland microclimate, analysis of nitrides from the atmosphere and rain in an agro-ecosystem, a typical red soil region on Experiment Station of Red Earth Ecology, Chinese Academy (Yingtan, Jiangxi) of Sciences in 2005. The results showed that the dry deposition N was 82.63 kg·hm-2, accounting for 67.94% of the total N, which was 132.6 kg·hm-2 in the whole year (2005). In N dry deposition progress, NH3-N and NO-3-N were the main settlement for gas and particle, respectively. NH3-N was made up 43.02% to 89.89% (mean value, 71.05%) of the gaseous N deposition while NO-3-N was accounted for 33.67% to 94.54% (mean value, 61.01%) of the particle N deposition. The N wet deposition fluxes were 0.50-8.45 kg·hm-2 per month and reached the higher value in July and November.