Altitudinal Patterns of Plant Communities and Species Diversity in the Habaxueshan Mountains,Yunnan, China Quantitative Vegetation Classification of Qichai Region in Hainan Island The Application of Non-metric Multidimensional Scaling in Community Classification Beta diversity of vascular plants and its influencing factors on islands in the Thousand Island Lake Characteristic of Plant Functional Groups Based on Ecophysiological Traits in a Tropical Montane Rain Forest of Hainan Island,South China