浅山丘陵区土地资源生态安全评价及关键因子识别

Ecological Security Evaluation of Land Resources and Identification of Key Factors in Hilly Region

基于压力-状态-响应(PSR)模型构建浅山丘陵区土地生态安全评价指标体系,并对研究区2000-2009年的生态安全进行动态评价;应用增量趋势判别法从动态变化中识别生态安全变化关键因子。结果表明:研究区的生态安全综合指数整体呈升高趋势,从2000年的0.485 1增至2009年的0.577 3,生态安全水平整体呈好转态势,安全等级从Ⅳ级(中警)转为Ⅲ级(预警);人口自然增长率、人口密度、水网密度指数、第三产业占GDP比重、植被覆盖指数、土地退化指数、农田旱涝保收率、生物丰度指数8项指标是影响该区域生态安全的关键因子,并针对其提出有利于区域生态安全发展的对策。

To investigate the ecological security of land resources in hilly region, the ecological security evaluation index system of land resources was established based on pressure-state- response（PSR） model,the dynamic evaluation of ecological security was done from 2000 to 2009, and the key factors were identified by the increment trend method. The results showed that the ecological security complex index increased from O. 485 1 to 0. 5773, and the safety level was increased from four to three during 2000 to 2009, indicating that the ecological security was improved. The key factors which influenced the ecological security were natural growth rate of population, population density, the density of water index, tertiary industry share of GDP, vegetation cover index, land degradation index, farmland drought and flood insurance yield, biological abundance index. Finally, the countermeasures about ecological security were put forward according to the key factors.