Analysis on the effect of establishment and inter-species relationship adjustment of mixed stands in southern Fujian Primary isolation and bioassay of allelochemicals from several tree species A SELECTION OF SUITABLE MULTI-PURPOSE ASSOCIATED TREE SPECIES FOR CHINESE FIR Study on population dynamics of Chinese fir and its associated tree species in natural Chinese fir-and-broad-leaved mixed forest in Northwest Fujian Biomass and its distribution of Chinese-fir treated with aqueous extracts of several tree species after six years