统万城废弃的原因分析

 在沙漠化研究中，沙漠古城的兴废在一定程度上指示着古城所在地的沙漠化过程。位于毛乌素沙地南缘的统万城，其废弃的原因一直为学术界所关注。通过综合分析统万城周边地区地质历史时期以及人类历史时期的气候变化，提出统万城地区生态环境变化乃至沙漠化主要取决于气候变化；统万城废弃所揭示的沙漠化成因给我们的启示是，对于沙漠化治理，必须“尊重自然，科学治沙”。

Discuss on Causes of Abandonment of Tongwan City in South of Mu Us Sand Land

Desertification process can be indicated by the flourish and decline of ancient cities in desert. The reason of the abandonment of Tongwan city, an ancient city which located on the southern margin of Mu Us Sandy Land, is always a hot research point. It has significance for the understanding of the environment change in the Loess Plateau and the predicting of the deserts expansion in the Northern of China. The comprehensive analysis of the environment and climate change in the Tongwan city during geological period and human historical period is made in this paper. The results show that it is the climate change that lead to the environment degradation and desertification in Tongwan city. The abandonment of Tongwan city illustrates that mankind must follow the natural laws while preventing desertification.