西北荒漠化地区土地生态安全评价——以酒泉市为例

Evaluation on Land Ecological Security in Desertification Areas of Northwest China——A Case Study of Jiuquan City

选择酒泉市作为研究区域,结合西部荒漠化地区的特点,利用PSR框架模型构建土地生态安全评价指标体系。通过熵权法和综合评价法计算土地生态安全值,对酒泉市土地生态安全状况进行动态评价和对比分析。结果表明:2000—2011年间酒泉市土地生态安全一直在敏感级别波动,生态问题显著。其中2002年土地安全状况最差,接近风险级别,2011年土地安全状况最好,接近良好级别。整体上酒泉市土地生态安全状况呈正向发展,人口增长率降低、环境污染负荷下降、农耕水平提高、社会经济增长等因素是土地状况改善的主因。

Given characteristics of the western desertification areas,this paper established the evaluation index system of land ecological security for Jiuquan City by employing PSR model.Based on this,this paper evaluated and analyzed Jiuquan City′s land ecological security by using weighted method and comprehensive evaluation method.The results show that between 2000 and 2011,the level of Jiuquan City′s land ecological security fluctuated around sensitive level,demonstrated obvious ecological problems.Among these years,the year of 2002 was the worst one with risky level,however,the year of 2011 was the best one with favorable level.Overall,decreased growth rate of population,reducing environmental pollution,increased farming level and enhancing social economic development commonly contribute to the improvements of Jiuquan City′s land ecological security.