北京市耕地后备资源开发适宜性评价

根据北京市自然、社会、经济资料及图件资料，在考虑各种影响耕地后备资源开发因素的基础上，结合GIS的空间分析功能，分别从自然适宜性和生态安全性角度构建了北京市耕地后备资源开发评价体系，通过对评价要素的空间叠加、计算，评价北京市耕地后备资源在不同条件下适宜性开发的面积和空间分布情况，并从经济可行性方面探讨北京市耕地后备资源开发的适宜性。结果表明：从自然适宜性评价上来看，北京市耕地后备资源能够开发的面积为 11 675.25 hm2，考虑生态安全因素后，适宜开发且不引起生态退化的耕地后备资源面积为11 221.14 hm2，如纳入经济可行性因素，北京市耕地后备资源全部不适宜开发。综合指数法与限制条件相结合的评价方法能够有效提高评价结果的合理性，评价结果可为北京市土地开发整理政策的制定提供理论参考依据。

Suitability evaluation of reserve resources of cultivated land development in Beijing

Suitability evaluation of reserve resources of cultivated land provides a scientific basis for reasonable exploitation and utilization of unused lands. Taking the whole unused land in Beijing as the evaluating object and based on physical, socioeconomic and graphic data, the evaluation systems for reserve resources of cultivated land development were established form the perspectives of physical suitability, ecological security and constraint factors. On the support of spatial analysis function in GIS software, area and spatial distribution of reserve resources of cultivated land development suitability under different conditions were evaluated, and the economic viability of reserve resources of cultivated land development was probed. The results indicated that the total area of reserve resources of cultivated land that could be developed was 11 675.25 hm2, form the physical suitability perspective. However, it would reduce to 11 221.14 hm2, if ecological security factors were considered. Furthermore if economic feasibility factors were taken into account, there would be no reserve resources of cultivated land that could be developed in Beijing. The combination of constraint factors with integrated evaluating framework can effectively improve the rationality of evaluation results, which also can provide a reference for the policy making of land development and consolidation in Beijing.