Interspecific relationships in the forest community dominated by Pinus kwang-tungensis, a Chinese native species Niche and Interspecific Interaction of Dominant Tree Population in Cephalotaxus oliveri Communities Interspecies covariation analysis of dominant tree species in secondary succession of forest communities in Heishiding Natural Reserve,Guangdong Province Altitudinal variation in the covariation of stomatal traits with leaf functional traits in Changbai Mountain Interspec ies Connection of Dom inant Tree Spec ies inCepha lotaxus fortune i Commun ities