从统万城的兴废看人类活动对生态环境脆弱地区的影响

位于毛乌素沙地南缘的统万城建成于公元４１９年，废毁于公元９９４年。统万城的兴废，不单单是一个城市的历史问题，而是揭示了北方生态环境敏感带地区人地关系的变化过程。本文在前人工作基础之上，利用大比例尺航空遥感影像判读、历史文献分析和实地考察等多种手段，在复原统万城的城市形态的基础上，对建城初期的当地生态环境做了一些初步的复原工作，并探讨了统万城从修建到废毁期间人类活动对当地生态环境的影响过程。

Human Activities' Influence on the Areas of Weak Ecological Environment in Terms of the Rise and Fall of Tongwan City

Tongwan City was built in A. D. 419, located in the very south end of Maowusu sand. It falled in A. D. 994. The rise and fall of it revealed the changing course of relations between human and nature in the northern areas of ecological environment being weak. Based on aeril remote sensing image, historical documents and on--the --spot investigation, the paper makes a preliminary study on the ecological environment in the early period of the city, and probes into human activities' influence on the ecological environment of the areas from the shaping and the fall of the city.