海南岛文昌县滨海沙土草地植被的研究

 海南岛文昌县滨海沙土草地植被，用改进的点样法——拉线点样法，测定的数据，所作的数量分析，可分为14个群丛，两个类型，6个主要群系(群落)：1．热带滨海沙土沼泽草地 1)薄果草+岗松群系(含5个群丛) 2)田葱群系(含1个群丛) 2．热带滨海沙生草地 3)鸭咀草+蜈蚣草群系(1个群丛) 4)蜈蚣草+金须茅群系(1个群丛) 5)鬣刺+单叶牡荆群系(1个群丛) 6)竹节草+野香茅群落(1个群丛)。在这6个群落(群系)中，以潜育性沙土上由薄果草和岗松组成的草地，以及半流动和固定沙土上以蜈蚣草、鸭咀草、野香茅为主的草地，面积最大，最有代表性。

STUDIES UPON GRASSLAND VEGETATION ON COASTAL SANDY SOIL AT WENCHAN COUNTY,HAINAN ISLAND

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.