Study of rainfall hydrochemical import characteristics in larix gmelini virgin forest

The hydrochemistry factors of rainfall and through-fall in the larix gmelini virgin forest of Genhe River of Daxinganling boreal zone were observed form 1995 to 1998．The results show that the macroelements of rainfall of hydrochemical importing in Daxinganling virgin forest zone are less than the other main forest areas of China and microelements tend to balance；when the rainfall which passed canopy turned into through-fall，tree tops of larix gmelini effect on absorbing in Na，Ca，Cu，and Fe，especially Ca and the water dripsout of K ，Mg，Zn，Mn，and P，especially K ；the macroelements and the microelements monthly changes are little except of Ca during growing periods．The monthly change curve of macroelements contain in the forest is“U”．