STUDIES UPON GRASSLAND VEGETATION ON COASTAL SANDY SOIL AT WENCHAN COUNTY,HAINAN ISLAND
海南岛文昌县滨海沙土草地植被的研究

Using the data obtained with Line-point contact,an improved point- contact method,we analysed the grassland vegetation on coastal sandy soil at wenchan County,Hainan Island.The vegetation can be divided into 14 associations,two types and six main formations or co- mmunities as follows: 1.Tropical sedgeland on coastal sandy marsh 1)Form.Leptocarpus disjunctus Baeckea frutescens(including 5 Ass- ociations) 2)Form.Philydeum lanuginosum(1 Asso.) 2.Tropical grassland on coastal sand 3)Form.Ischaemum aristatum Eremochloa ciliaris(1 Asso.) 4)Form.Eremochloa ciliaris Chrysopogon orientalis(1 Asso.) 5)Form.Spinifex littoreus Vitex rotundifolia(1 Asso.) 6)Comm.Chrysopogon aciculatus Cymbopogon tortilis(1 Asso.) In these communities the sedgeland of Leptocarpus on gleyed sandy soil,and the grassland on helf-fixing and fixed sandy soil domi- nated by Eremochloa,Ischaemum and Cymbopogon are the largest and most representative in this area.