A Study on Site Quality Evaluation of Natural Tropical Mountainous Rain Forest in Hainan Island

Forest formation was selected to be basic unit of site quality evaluation of natural tropical mountainous rain forest in Hainan Island.The average dominant tree height and DBH of dominant tree species group in forest formation were selected to be dependent variable and independent variable of site quality evaluation model.Standard DBH is 40 cm by quantitative analysis.Site quality evaluation model of three formation type,which are Podocarpus imbricatus Blume, Keteleeria hainanensis Chun et Tsiang, Quercus championi Benh. forest; Dacrydium pierrei Hickel, Syzygium areiocladum Merr Perry, Xanthophyllum hainanense Hu forest;and Castanopsis fabri Hance, Schefflera octophylla(Lour.)Harms, Endospermum chinense Benth forest,were established.The adaptability of the model was tested and the result showed that the difference between theoretical value and investigating value was not obvious.So the site index table was established.