This paper deals with the relationship between the growth rate of Picea wilsonii and neighbourhood interference.The significant correlation between Picea individual growth rate and the indices of local interference demonstrates that interference occurs and that the pioneer tree species, Populus davidiana, Betula plat-yphylla,and Picea wi/sonii itself are competitively related with the growth of Picea wilsonii individuals. We are able to account for more than 30% of the variation in plant growth rate of Pice...