干旱半干旱地区土地沙漠化信息系统的设计与应用

“数字地球”战略的提出得到各界人士的广泛关注,并从各自专业角度献计献策。但“数字地球”战略的实施必须以区域或专题为切入点。本文从我国干旱半干旱地区沙漠化比较严峻及西部大开发以生态环境建设为目标的背景出发,结合研究区的自然、人文特征,设计干旱半干旱地区沙漠化信息系统的总体结构、功能、模型,系统包括数据库管理子系统、土地沙漠化信息查询子系统、模型库管理子系统等。系统设计的同时选择典型示范区进行了实践。结果表明,系统在其数据项相关性方面已满足本专题GIS系统的功能和模型的要求,本系统可为生态环境恶化、土地沙漠化预测与评估以及决策部门及时采取防治措施和对策。提供迅速、动态的信息和技术支撑。

The Design and Application of Land Desertification Information System in Arid and Semiarid Areas

The raise of "Digital Earth" strategy has aroused concern of personages of various circles, and contributed suggestions from their respective disciplinary angles. But the implementation of "Digital Earth" strategy must take area or special topic as the point of penetration. This paper, proceeds from the background of relatively severe desertification in China's arid and semiarid areas and the western development aiming at eco-environ-ment construction, in combination with physical and human characteristics of the study area, designed the land desertification information system in arid and semiarid areas in terms of the whole structure, function, model of arid and semiarid area desertification GIS. The system consists of three subsystems, namely, the database administration subsystem, the subsystem for inquiry of land desertification information, the subsystem for managing the model database. Meanwhile the selection of the representative demonstration area has been put into practice. The result indicated that, although the system needs to open up and improve further, the correlativity of the system's data term has satisfied the function and model demand of the present special topic's GIS system. This information system can provide quick, dynamic information and technique support for prediction and evaluation of the eco-environmental deterioration and land desertification, as well as for timely adopting prvention measures and countermeasures by decision-making department.