基于DPSIR模型的土地生态安全评价研究——以广东省佛冈县为例

针对佛冈县的土地生态的实际状况,基于"驱动力-压力-状态-影响-响应"(DPSIR)模型,构建土地生态安全评价指标体系,运用最优组合赋权法确定指标权重及土地生态安全综合评价模型对该区域进行评价。结果表明:1998—2008年佛冈县土地生态安全整体状况不断改善,生态安全综合指数从1998年的0.2567增至2008年的0.5858,生态安全水平处在从"风险级"状态转向"比较安全"状态的过程;从相关性分析来看,响应指标对土地生态安全水平的提高起主要的作用,但随着社会经济的加速发展,需要协调好各方面的矛盾,缓解资源环境的压力,使得土地生态环境朝着更好的方向迈进。

Land Ecological Security Evaluation Based on DPSIR Model: A Case Study of Fogang County of Guangdong Province

In allusion to the actual land ecology in Fogang County,based on the "Driving Force-Pressure-State-Impact-Response" (DPSIR) model,this paper establishes the land ecological security index system and uses the optimal combination weighting method to determine index weights and land ecological safety assessment model and to evaluate the region.The results show that the overall situation of land ecological security in Fogang County was improving from 1998 to 2008,with composite index increasing from 0.2567 in 1998 to 0.5858 in 2008,ecological security level changing from a "risk class" status to a "safer" state.Correlation analysis indicates that response indicators played a major role in raising land ecological security level.With the accelerated social and economic development,it is necessary to address contradictions so as to relieve the pressure on resources and environment,securing a better land ecological environment.