Comparative analysis of inter-specific association within the Stipa grandis-S. krylovii community in typical steppe of Inner Mongolia, China Numerical analysis of inter-specific relationships in Alpine steppe community in Bayanbulak Numerical analysis of inter-specific relationships in the estuary salt marsh plant community of southern Chongming Dongtan, Shanghai. STUDY ON THE INTER-SPECIFIC ASSOCIATION OF SPECIES IN THE VEGETATION LAYER IN CASTANOPSIS KAWAKAMII FOREST