中文摘要：

利用雨量器收集降雨样品的方法,研究了帽儿山地区大气氮湿沉降的浓度、沉降量及其动态变化规律。研究结果表明：2011年随降雨输入到该地区的大气氮沉降量为19.16 kg·hm-2,其中,NH＋4-N、NO-3-N和溶解有机氮（DON）输入量分别占湿沉降量的52%、26%和22%,NH＋4-N/NO-3-N沉降量接近2.0。降雨中NH＋4-N对当地大气氮湿沉降输入量的贡献率最大,其平均浓度为1.59 mg·L-1。氮湿沉降浓度存在明显的季节差异,以5和9月氮浓度最高,7月最低。该区NH＋4-N、NO-3-N和总氮（TN）湿沉降输入量与降雨量均存在极显著正相关,决定系数分别为0.65、0.63和0.76,而DON输入量与降雨量相关性交差（P〉0.05）,其决定系数为0.24。

英文摘要：

We studied the dynamic changes of atmospheric nitrogen deposition concentration and amount in precipitation collected by a standard rain gage, in Maoershan area. The total amount of atmospheric nitrogen deposition from precipitation was 19.16 kg · hm-2, and the proportions of NH4＋-N, NO3--N and DON to total nitrogen deposition in precipitation were 52%, 26% and 22%, respectively. The ratio of NH4 ＋-N to NO3- -N was nearly 2.0. On a seasonal basis, the average content of NH4＋ -N deposition in precipitation was 1.59 mg · L-1 with the greatest contribution to atmospheric nitrogen wet deposition. There was an obvious seasonal change in the contents of total atmospheric nitrogen wet deposition, being the highest value in May and September and lowest in July. Moreover, the monthly amounts of NH4＋ -N, NO3- -N and total nitrogen input from wet deposition were all positively related with the time of rainfall （ P 〈 0.01 ） with the correlation coefficients of 0.65, 0.63 and 0.76, respectively. However, the monthly amount of DON nitrogen input from wet deposition was not significantly correlated with the time of rainfall （ P 〉 0.05 ） with the correlation coefficient of 0.24. The high annual NH4＋/NO3- ratio compared with the more developed region suggested that N deposition in this region was mostly affected by agricultural activities rather than industrial activities.