The concentrations of 9 nutrient elements (N,P,K,Ca,Mg,Cu,Zn,Mn,SiO2) in stem-flow, and rainfall were measured in 22-25 years old Cinnamomum camphora, Pinus taeda, Quercus aliena, Michelia macclurei from April of 2003 to July of 2004 at Zhuzhou. The results showed:the concentrations of the nutrients in rainfall varied according to the month; The concentration sequence of the nutrient elements in precipitation were follows: Ca > NH4-N > SiO2 > Zn > K > NO3-N > Mg > Fe > Mn > P > Cu; The concentrations of the nutrients in stem-flow also varied in the same way and ch...