关键词: 沙坡头地区, 固沙植物, 引种栽培

Abstract: Through 35 years of introduction and plantation of sand-fixing plants on moving sand dunes under non-irrigated condition in Shapotou area, the following principles for the selection of sand-fixing spesies have been established:(1)As for the foreign species they must be introduced from temperate sandy lands and can withstand a lower temperature as low as -25℃, whereas for the domestic species they must be introduced from sandy lands in semi-desert and desert zones with a rainfall of less than 300mm. Both pioneer and mid-stage plants in the successional processes should be considered in the selection work for the planting on either windward or leeward slopes of moving sand dunes, but any tree species or species relating to hydroseres cannot be chosftd.(2) Standards for the successful intrduetion should include: higher survival rate, above70%, rapid growth, and persisting in the sand-fixing function in several years, and can produce flowers and seeds. In addition, they should have longer life-span, say above 10 years, and they can be used to establish artificial vegetation on upwind slopes or fix sand on leeward slopes. It would be best if they can regenerate naturally.