DYNAMIC STUDY OF SUSTAINABLE DEVELOPMENT OF PREE SYSTEM IN EASTERN GANSU LOESS PLATEAU——A CASE STUDY OF QINGYANG CITY IN GANSU
以甘肃庆阳市为例，建立可持续发展指标体系，用改进熵权法计算子系统综合发展指数，动态研究1978-2005年人口、经济、资源环境的协调水平，揭示问题并提出建议。
Population, resources, environment and economic interact each other constitutes a dynamic and open PREE system, in this paper, we established a indicator system of sustainable development as an example for Qing yang City, use improved entropy law to give weights, calculate the Comprehensive Development Index of all the Sub-systems, then we take dynamic research of sustainable development to the population, the economy, the resources and environment of eastern Gansu Loess Plateau in 1978-2005, and explore the coordination level of development between the various sub-systems, reveal the issue of sustainable development in Qing yang City, at last give the relevant recommendations of sustainable development .