Analysis on classification and species diversity of Pinus taiwanensis community in Daiyun Mountain National Nature Reserve

Classification and species diversity of Pinus taiwanensis Hayata community in Daiyun Mountain National Nature Reserve were analyzed by typical sampling method.Taking important value of main tree species in arbor layer as reference index,the P.taiwanensis community could be divided into eight association types by means of hierarchical cluster analysis: Assoc.P.taiwanensis+Cunninghamia lanceolata-Lindera aggregate-Dicranopteris linearis;Assoc.P.taiwanensis+Cyclobalanopsis multinervis-Eurya loquaiana-Hicriopteris glauca;Assoc.P.taiwanensis+Clethra cavaleriei-Vaccinium carlesii-Dicranopteris linearis;Assoc.P.taiwanensis+Castanopsis eyrei-Oligostachyum oedogonatum-Hicriopteris glauca;Assoc.P.taiwanensis+Enkianthus quinqueflorus-Vaccinium carlesii-Woodwardia japonica;Assoc.P.taiwanensis+Rhododendron farrerae-Vaccinium carlesii-Hicriopteris glauca;Assoc.P.taiwanensis + Faguslucida-Rhododendronmariesii-Dicranopterislinearis;Assoc.P.taiwanensis-Rhododendron mariesii-Isachne truncata.Overall species richness and diversity indexes of each association appear decreasing trend generally with altitude rising,and Pielou and Alatalo indexes of overall evenness index show a little fluctuation.In vertical structure of community,there are differences in species richness,diversity and evenness indexes of arbor,shrub and herb layers,and there is a large fluctuation of above three indexes of arbor and shrub layers among different associations,while the fluctuation of those of herb layer is a little and their values are smaller than those of arbor and shrub layers.The analysis result indicates that altitude is a major factor determining diversity difference of the P.taiwanensis community.