广西海岸沙生植被的类型及其分布和演潜

广西海岸沙生植被由热带耐盐性的植物组成,主要有厚藤群系的沟叶结缕草、飘拂草—厚藤群落,中华补血草、铺地黍—厚藤群落,鬣刺、单中蔓荆—厚藤群落,绢毛飘拂草、麦穗茅根—厚藤群落;露兜勒群系的露兜勒、仙人掌—沟叶结缕草群落;薄果草群系的薄果草、岗松群落和沙生灌木群系的酒饼勒、变叶裸实、仙人掌—沟叶结缕草群落。这些群落在沙滩上的生态分布是由盐性不同的建群种,依上述群落顺序,大致从潮汐带之上的潮湿至湿润—高盐度沙滩的以厚藤群系分布为主的沙生植被为前带,经湿润至于燥—中盐度沙滩的以露兜勒群系分布为主,兼有厚藤群系的沙生植被为中带,至干燥—完全或基本脱盐沙滩、沙地的蒲果草群系和灌木沙生群系至陆域上的季雨林沙生植被为后带。广西海岸沙生植被主要以湿润度、干燥度和盐度为演替外力。

Types, Distribution and Evolution of Sandy Vegetations along Coasts in Guangxi

Guangxi coastal sandy vegetations consist of tropical saline plants. The key groups of these plants are Zoysia matrella,Fimbristylis spp.,Ipomoea pes caprae community,Limonium sinensis,Panicum repens,Ipomoea pes caprae community,Spinifex littoreus,Vitex trifolia var.simplifolia,Ipomoea pes caprae community,Fimbristylis sericea,Peroria hardeifonnis Ipomoea pes caprae community,pandanus tectorius formation:Pandanus tectorius,Opuntia dillenii Zogsia matrella community,Leptocarpus disjunctus formation:Leptocarpus disjunctus,Baekdea frutescens community and sand life shrubs formation:Atalamtia buxifolia,Gymnosporia diversifolia,Opuntia dillenii Zoysia matrella community. These formations release an onshore vegetation transition from spring tidal line landward with decreasing humidity and salinity of sand dam.The succession of the coastal sandy plant community is critically affected by soil substrate, humidity and salinity.