The contents of 9 nutrient elements (N,P,K.Ca,Mg,Cu.Zn,Mn.SiO2) in stem-flow, rainfall were measured in 4 tree species at 22 - 25-year-old grown in Zhuzhou, Hunan Province, such as Cinnamomum camphora, Liquidambarformosana, Eucommia ulmoides. Osmanthus fragrans from April of 2003 to July of 2004. The results showed that the content's of the nutrients in rainfall varied according to the month;the content sequence of the nutrient elements in precipitation were as follows: Ca〉 SiO2 〉 Zn〉 NH4^+ -N 〉 K〉 NO3^- -N 〉 Fe 〉 Mg 〉 Mn 〉 P〉 Cu...