ON THE RHODODENDRON SIMIARUM ELFIN FOREST OF CHINA Species Composition and Community Structure of Typical Subtropical Evergreen Broad-leaved Forest and Subtropical Montane Elfin Forest in Shimentai National Nature Reserve in South China Population Structure and Spatial Patterns of Five Syzygium Species in Tropical Evergreen Monsoon Elfin Forest, Tongguling A Preliminary Study of Mossy Elfin Forest in Fanjinshan Mountain of Guizhou