地质条件是该区地质灾害发生的内在动力基础，自然环境和人类经济活动是地质灾害发生的外在动力和促进因素。

In Xiuyan area, the geological conditions are the internal kinetic foundation of geological diaster, and the natural environment and human economical activities are the external factors.

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指出今后应加强地质环境与地质灾害的区划研究，以切实保护好自然环境。

Some prgrammes about environmental geology, environmental protection, the exploitation and rtilization of geological surroundings should be carried on.

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沙漠化灾害是在特定自然环境背景下产生的，严重危及人类生产和生存。

Desertification disaster is caused by particular natural environment. It hazards seriously human "s produce and living."

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