The nitrogen deposition experiments on Cinnamomum camphora plantation of Hunan provincial botanical garden were simulated from June the 7th to October the 7th 2010,the nitrogen deposition levels was respectively as control(CK,0 g·m^-2a^-1),low nitrogen(LN,5 g·m^-2a^-1),medium nitrogen(MN,15 g·m^-2a^-1) and high nitrogen(HN,30 g·m^-2a^-1).The soil respiration speed and soil surface temperature and the surface water content of the soil were determined by LI-8100 measuring instrument.The results show that the average values of soil res...