Abstract: Analysis was carried out to the amount,component,falling rule,decomposition rate and the nutrients return of litterfall in the mixed forest of M.yuyuanensis and C.lanceolata,as well as those of C.lanceolata pure stand.The results showed that annual litterfall was up to 4004 kg穐m^-2 in the mixed forest,which was 2.15 times higher than that in the pure C.lanceolata stands.Needle litter was the maximum in the components of litterfall.M.yuyuanensis had three peaks of litterfall.Decomposition period of M.yuyuanensis was 2.1 yr in the 95% of litterfall,while 4.4 yr was needed for C.lanceolata.It was faster in the return of nutrient elements in the mixed forest,which suggested that mixed stands have a positive effect on the preservation of soil fertility and the sustainable development of forestry.

Key words: SRES, Climate change, Rice, Simulation