中文摘要：

采用APS-2A型降水降尘自动采集仪，定位收集2012年5—10月重庆缙云山自然保护站的湿沉降数据，分析该地区大气氮湿沉降浓度及沉降的组成、月变化及季节变化。结果表明：1）相对于NO；．N和DON（可溶性有机氮），降雨中NH4±一N的质量浓度较高，说明该地区NH，的排放量较高；2）缙云山地区大气活性氮主要是还原态的NH4一N，其主要来源于农业生产；3）监测期内湿沉降中NO3--N、NH4±-N和DON的平均质量浓度分别为（0．441±0．304）、（0．821±0．480）和（0．203±0．211）mg／L，3种形态氮的月平均质量浓度排序为NH4±-N〉NO；．N〉DON；4）NOx-N、NHf-N和DON的最大沉降量均出现在5月，其平均湿沉降量分别为（0．642±0．292）、（1．273±0．739）和（0．329±0．231）kg／hm2，占总氮湿沉降量的比例分别是29．76％、56．27％和13．98％；5）氮质量浓度与降雨量、降雨强度之间的相关关系均很弱，而氮湿沉降量与降雨量之间呈显著的线性相关关系（P〈0．01），说明该地区氮湿沉降量主要受降雨量的影响，但是降雨量、降雨强度对氮质量浓度的影响都很小。

英文摘要：

Field observation of nitrogen wet deposition in Jinyun Mountain, the natural conservation station of southwestern China, was fixed collected by APS-2A precipitation-dust automatic acquisition instrument from May to October 2012, based on which the composition, monthly and seasonal variation of nitrogen wet deposition were analyzed. Results showed that ： 1 ） the concentration of NH4 -N was higher than that of NO3--N and DON （dissolved organic nitrogen） , indicating that emission load of NH3 within this area was generally high; 2） the major form of atmospheric reactive nitrogen in Jinyun Mountain area was reduced nitrogen NH4-N, which primarily came from agricultural productivity; 3 ） the average concentrations of NO3-N, NH4 -N and DON in precipitation were （0. 441 ± 0. 304 ）, （0. 821 ± 0. 480 ） and （0. 203± 0. 211 ） mg/L during the monitoring period, respectively, of which the above three nitrogen forms ranked in NH4 -N 〉 NO3- -N 〉 DON ; 4） the highest concentrations of NO3- -N, NH4 -N and DON all occurred in May, and the average values were （0.642 ±0.292）, （1.273±0.739） and （0.329± 0. 231） kg/hm2, accounted for 29.76%, 56.27% and 13.98% of the total nitrogen wet deposition, respectively; 5） nitrogen concentration was weakly correlated with rainfall and rainfall intensity, while the total nitrogen wet deposition presented an obvious linear correlation with the precipitation amount （P 〈 0.01 ） , which demonstrates that nitrogen wet deposition is mainly affected by rainfall, but rainfall and rainfall intensity have little impact on N concentration.