关键词: 沙尘暴, 时空分布, 调整结构

Abstract: There are four large sandstorm sources in China, they are source in Hexi Corridor of Gansu Province and Alxa of Inner Mongolia, source in Taklimakan Desert of Tarim Basin, source in Hunshandake and Horqin sandy lands and source in area along the Great Wall in Ningxia, Inner Mongolia and Shaanxi provinces. The fore two sources are situated in the desert and desertified areas west to Helanshan Mountain and the later two in the agricultural and pasturing interlaced zone east to the mountain. In the interlaced zone the causes of sandstorm formation include natural factors (aridization, precipitation decreasing, frequent gale, and adequate sand sources etc.) and anthropogenic factors (reclamation, over grazing, excessively herb digging etc.).

Key words: sandstorm, temporal-spatial distribution, structure adjustment