Measurement and Sampling were conducted during the growing season in natural stand of Fagus orientalis Lipsky, and in Kelardasht region, Northern Iran. To measure and sampling gross rainfall (GR) and throughfall (TF), four and 20 respectively rain-gauges were installed. There were significant difference between incident rainfall and throughfall for NO3- and P concentrations, but concentration of K+ was different between rainfall and troughfall of F. orientalis stand. The average enrichment of K+ was highest. Flux amount of NO3- was significant difference between F. orientalis stand and GR. The average enrichment of K+ was highest. Forest canopy can alter the chemical composition of precipitation. In fact nutrient return to the forest floor may have played a very important role in the nutrient cycling.
