中文摘要：

2004年11月～2005年10月，以小叶栎林地为研究对象，研究了大气沉降氮通量及其3种物理形态（气态、颗粒态、雨水）4种氮化物（NH3，NH^＋4-N，NO3-N，NO2）的相对贡献．结果表明，大气氮沉降总量为82．8kg／（hm^2-a），其中干沉降占67％；NH3-N是氮沉降的主要贡献者，占干沉降的82％，占总氮沉降量的56％；还原态的氮化物（NH3,NH^＋4-N）占总氮沉降量65％．

英文摘要：

From 2004 November to 2005 October, the inputting of nitrogen fluxes into forestland from atmospheric deposition and its relative contributions of three kinds of physical form （gas, particulate and rainwater） and four kinds of nitrogen compounds （NH3, NH^＋4-N, NO3-N and NO2） were studied with study object of broadleaf forest （Quercus chenii） at Forest Micrometeorological Experiment Sub-Station, Experiment Station of Red Soil Ecology, Chinese Academy of Sciences. Total amount of atmospheric nitrogen deposition was 82.8 kg/（hm^2-a）, in which dry deposition occupied 67%, NH3 was the main contribution, occupying 82% of the dry deposition, and 56% of the total nitrogen deposition amount. Reduced nitrogen compound （NH3, NH^＋4-N） occupied 65% of the total nitrogen deposition amount. Therefore, the contribution of atmospheric nitrogen deposition should be considered when studying the forest soil acidification and management.