中文摘要：

为了解天童地区森林内外氮素湿沉降的组分分配及其季节动态特征,基于离子交换树脂法对其森林内外氮素湿沉降量进行了为期2年（2011年3月至2013年2月）的观测.研究发现：（1）天童森林内外硝态氮沉降月总量分别在0.22-3.73 kg·N/（hm^-2·月）和0.13-2.85 kg·N/（hm^-2·月）之间波动,均呈现出秋冬季较高、夏季较低的季节动态特征;森林内外铵态氮沉降月总量在0.17-1.35 kg·N/（hm^-2·月）和0.21-1.44 kg·N/（hm^-2·月）之间波动,春季沉降量略低于其他季节;（2）天童森林内外氮素湿沉降量的季节动态受到研究区域所属季风气候、夏季台风和农事活动的综合影响;（3）森林内外硝态氮与铵态氮沉降量比例的年平均值均为0.9,表明化石燃料燃烧与农事活动对本地区氮素湿沉降的影响相当;（4）天童森林内外氮素湿沉降年总量分别为18.86 kg·N/（hm^-2·年）和17.51 kg·N/（hm^-2·年）,氮素湿沉降年总量符合中国东部森林氮沉降量由北向南逐渐增加的趋势.

英文摘要：

The fluxes of wet nitrogen deposition inside and outside Tiantong forest were observed for 2 years（from March 2011 to February 2013）,basing on Ion-exchange resin method,to examine the composition and the seasonal dynamics of wet nitrogen deposition in Tiantong forest.The results showed that：（1）The monthly fluxes of nitrate nitrogen inside and outside forest were 0.22-3.73 kg·N/（hm^-2·month）and 0.13-2.85 kg·N/（hm^-2·month）,respectively,which both had higher fluxes in autumn and winter,while lower fluxes in summer.The monthly fluxes of ammonium nitrogen inside and outside forest were 0.17-1.35 kg·N/（hm^-2·month）and 0.21-1.44 kg·N/（hm^-2·month）,respectively.The monthly fluxes of ammonium nitrogen were lower in spring than in other seasons.（2）The nitrate nitrogen deposition fluxes were lower than ammonium nitrogen deposition fluxes in spring and summer,while higher in autumn and winter.Moreover,the average ratio of nitrate nitrogen to ammonium nitrogen was 0.9,whatever inside and outside forest.（3）The wet nitrogen deposition fluxes were higher in autumn and winter inside and outside forest,respectively,resulted from the influences of monsoon climate,typhoons in summer and the farming activities in Tiantong region.（4）The annual wet nitrogen deposition fluxes inside and outside forest were 18.86 kg· N/（hm^-2· a）and17.51 kg·N/（hm^-2·a）,respectively.