On the basis of field soil sampling,this paper investigated the distribution characteristics of soil different nitrogen( N) forms and its influence factors in the different typical zonal soils. The results showed that the concentrations of soil extractable total N,extractable organic N and adsorbed amino acids extracted with 0.5 mol·L~(-1) K_2SO_4 significantly increased along the altitudinal gradient in the different vertical soils,and their mean concentrations were greater than that in the horizontal soil...