【摘要】 在描述库布齐沙漠和毛乌素沙地沙丘基底地形之后，分析了流动沙丘分布规律与基底地形的关系。在明确沙地形成时代概念的基础上，论证了该沙漠与沙地分布范围上的稳定性，库布齐沙漠为扩展型的，毛乌素沙地属稳定型的。库布齐沙漠的风沙危害包含了直接与间接危害２种类型；毛乌素沙地风沙危害主要是沙丘再流动，有３种危害途径。最后，根据毛乌素沙地沙丘分布规律，分析了引起沙丘再流动的人为因素和自然因素，及其各自所占的比重。更多还原

【Abstract】 Based on the description of the basal topography of dunes in the Hobq desert and the Mu Us sandlands relationship between the distribution of dunes, especially active dunes, and the basal topography analyzed in the two sandlands judged by the stability of extent of the sandlands,the Hobq is an expansive pattern, and the Mu Us is a stable pattern.Hazard of wind-drift sand mainly comes from reactivation of dunes in the Mu Us. Ratio of natural force and human activities contributing to the reactivation of dunes varies from region to region for the difference of the population density.更多还原