SRAP Analysis of Genetic Diversity of Riparian Plant Distylium chinense in Hubei Province Chemical constituents from roots of Distylium myricoides The Structure and Distribution Pattern of Dominant Populations in Castanopsis carlesii Community Tolerance and Physiological Response of Distylium buxifolium and Its Cultivars to Salt Stress Effects of Shading on Growth and Photosynthetic Characteristics of Distylium chinense Seedlings Effect of Flooding on Growth, Photosynthesis and Fluorescence Characteristics of Distylium chinense