基于 PSR 模型的南水北调中线工程水源区土地生态安全评价以南阳市为例

摘要

结合南水北调中线工程水源区土地利用结构变化的特点，采用PSR评价框架，从压力、状态和响应三个层面选取21个因素指标建立了水源区土地生态安全评价体系，并从土地利用结构变化信息熵和土地生态安全综合评价两个方面对水源区土地利用变化情况进行了研究。结果表明，水源区土地利用结构正从无序到有序发展，但土地生态安全整体情况不容乐观，急需采取相应措施缓解其土地生态安全压力。%According to the characteristics of structural change of land use in water source area of South-to-North Water Diversion Project ,this paper adopts PSR(Pressure-Status-Response) framework and constructs an evaluation index sys-tem of land ecological security including 21 indexes .Then it studies change of land use from the two aspects ,namely struc-tural change of land use and synthetic evaluation of land ecological security .Results show that land use structure is evolving from disorderly direction to orderly and stable direction ,but the overall situation of land ecological security is not optimistic . It is urgent to take appropriate measures to ease the pressure of land ecological security in water source area .