采用GIS,以云安县为例,以100m×100m格网作为评价单元,根据格网内的环境特征,选用对区域开发建设影响较大的自然生态、生态服务、灾害风险等作为生态敏感性评价条件,约束区域的发展;在分析经济社会发展空间格局的基础上,采用资源承载力、社会支撑力、经济发展力、集聚辐射力、区位支撑力和外部推动力综合评价了经济社会综合发展潜力,作为区域发展的推动力,综合考虑生态敏感性和社会经济综合发展力,划分了主体功能区,并分析了各区的发展方向主要功能和管制措施。

Based on GIS, this paper presents a case study of major function zone of Yun'an County in Guangdong Province. The author holds that the dividing of major function zone is related to two important conditions. One is the conditions which accelerate urban development. The other is the one which restricts urban development. Resources carrying capacity includes two criterions: natural and human resources; Social supporting ability includes social facility and social guarantee criteria; Economic developing ability includes economic accounts, economic quality and economic development speed criteria; Aggregation-radiation ability includes urbanization grades and town grades; Geo-position supporting ability includes infrastructure and transportation convenient criteria; External promotion ability includes public cognitive degree; Physical ecology factors include water, demography and vegetation criteria; Ecological services are physical protection districts in different grades; And hazard factors are mainly water disaster. According to physical and economic conditions, grids with scales of 100 meters are set to be evaluation units. The environments, physical ecology, ecological services, hazards in units are calculated for protecting environment and restricting urban development. Resources carrying capacity, social supporting ability, economics developing ability, aggregation-radiation ability, geo-position supporting ability, and external promotion ability were used to evaluate social and economic developing ability. The weights of resources carrying capacity, social supporting ability, economic developing ability, aggregation-emission ability, geo-position supporting ability and external promotion ability are set to 0.14, 0.16, 0.27, 0.13, 0.19, and 0.11 respectively.
In the light of the consideration of protecting ecology and developing economy, and building evaluation arrays, the author divided the major function zones of Yun'an county into 6 grades based on urban development extent. They are priority development district, suitable development district, little suitable development district, major protecting district, agriculture development district and control development district. The area of each district is 24.91, 61.57, 33.25, 306.28, 47.59 and 722.57 km² respectively. Moreover, policies for each major function zone are analyzed and put forward. The result indicates that there are only 7.23% places suitable to be developed while other places need to be protected. Finally, the result points out that the responsibility of protection of some main functional zones is very serious while developing economy in Yun'an County.