Litter fall production and nutrient dynamics of Cinnamomum camphora in subtropical region

Based on the position research of Cinnamomum camphora forest for a year(2009～2010) in Hunan forest botanical gardens,the biomass and nutrition returns of the stand were investigated.The results show that the annual litter of the forest was 3.26 t·hm-2a-1 and leaf dominated(in 71.09%),and the monthly litter fall pattern appearing single peak,appeared litter peak in August;the total of forest litter nutrients return quantity of N,S,P,K,Ca,Mg was 78.433 9±4.129 1 kg·hm-2a-1.To every components,the elements in the litter nutrient components were ordered from large to small: foliagebranchesfruits;the decomposition rate of leaf litter was 2.465 1 t·a-1,95% turnover was 1.22 year,50% turnover was 0.28 year,and that of branch litter was 0.928 9 ta-1,turnover was 3.23 year,50% turnover was 0.28 year.The decomposition of the branches and leaf of the litter was the fastest in the summer.