Vegetation Science and Vector Analysis Vegetation Composition in the Mangrove Forest Nature Protection Area of Qinglan,China Species diversity of degraded vegetation in different age restorations in Horqin Sandy Land, Northern China Understory vegetation composition and main woody population niche of artificial masson pine forest in south subtropical area Investigation on the vegetation of iron tailing wasteland in Shilu, Changjiang, Hainan Province Effect of Grassland Enclosure on Vegetation Composition and Production in Headwater of Yellow River LI Yuan-yuan, DONG Shi-kui*, LI Xiao-yan, WEN Lu (School of Environment, Beijing Normal University, Beijing 100875, China) Abstract: