关键词: 沙冬青, 植物群落, 残遗种

Abstract: The plant community of Ammopiptanthus mongolicus is evergreen plant community in desert region of China. It distributes in the east of desert region and desert steppe region. we discovered that it has a great area of distribution in Shacongwan-Tonghushan of Tengger Desert, the north of Shapotou area,in 1991 years. Its area reaches over 7133 ha.Its constructive species,Ammopiptanthus mongolicus, is an ancient relic species of the Tertiary Period. Our country had listed it into first-class protective plants, which is valuable, rare and in imminent danger.Owing to this plant community is evergreen plant community of desert region,therefore it possesses special meaning in the way of scientific researches, for example,it possesses important reference value to research the ancient weather and weather changes of this region.Constructive species, Ammopiptanthus mongolicus, is evergreen plant, and is also extreme xerophyte.It endures drought very well. It very suits to building windbreak and sand-fixing forests and water and soil conservation forests in desert region and loess region, therefore it is worth widely planting.

Key words: Plant community, Ammopiptanthus mongolicus, Relic species