Communities’ dendrogram in Cat Ba National Park. The numbers 1, 2, 3 and 4 showed the order of forestry communities after hierarchical cluster analysis. 1, Saraca dives + Calamus tetradactylus community (SCt); 2, Sterculia lanceolata + Chloris barbata community (SCb); 3, Ficus superba + Acanthus ebracteatus community (FAae); 4, Clausena excavata + Desmos cochinchinensis community (CDc). The “Height” axis shows the clustering height value associated with the Ward clustering method. The text of each branch showed the acronym of sample plots. LLA, low land area; MSA, mid-slope area; ISA, isolated area.