Species diversity and floristic analysis of the Pinus dabeshanensis community

The species diversity and floristic components of the Pinus dabeshanensis community were studied based on 22 sample plots (20 m×20 m). The results showed that there were 209 vascular plant species in total belonging to 152 genera and 71 families, with a total area of 8800 m². Among them there were 4 families, 5 genera, and 6 species in Pteridophyte; 3 families, 3 genera, and 4 species in Gymnosperm, and 64 families, 144 genera, and 199 species in Angiosperm. Rosaceae, Lauraceae, Compositae, Ericaceae, Leguminosae, and Gramineae were the dominant families in regards to species number in the studied community. Floristic analysis revealed that the flora was ancient and the geographical components were complex. Among 67 families, 21, 31, and 15 belonged to cosmopolitan, tropical, and temperate distribution, respectively. In addition, 43 and 89 genera belonged to tropical and temperate distribution, accounting for 32.58% and 67.42% of the total, respectively. The Margalef (R), Simpson (D), Shannon-Wiener (H), and Pielou (E) indices were determined for the arbor, shrub, and herb layers. Except for the diversity index E, the other indices were the highest for the shrub layer, followed by the arbor layer, and finally the herb layer. The value of E was similar for the shrub and herb layers, which were both higher than that of the arbor layer.