摘要
【目的】评价甘肃省民勤县6个乡的生态安全等级,为民勤县的荒漠化治理提供科学依据。【方法】首先根据最佳投影值及其对应等级的关系,构建了用于生态安全评价的遗传投影寻踪插值模型,然后以甘肃民勤县6个乡(昌宁乡、蔡旗乡、苏武乡、双茨科乡、红沙梁乡、南湖乡)为主要生态安全评价单元,根据生态安全的目标,从资源生态环境压力、资源生态环境质量、资源环境保护整治能力3个方面构建了包括15个评价指标的民勤县生态安全评价体系,最后采用遗传投影寻踪插值模型对6个乡的生态安全进行了评价。【结果】生态安全评价结果显示,民勤县荒漠化程度严重,所评价的6个乡中,昌宁、苏武、红沙梁生态系统处于较不安全水平,双茨科、南湖生态系统处于不安全水平,蔡旗的生态系统接近不安全水平。可知,民勤县的生态安全水平总体较低。【结论】在生态评价中,采用遗传投影寻踪插值模型所得结果比较客观、合理。
[Objective] The research was to study ecological security of 6 towns at Minqin,Gansu prov- ince to improve the protection of Minqin from desertification. [Method] Firstly, according to the relation between optimal projection values and corresponding grades,a genetic projection pursuit interpolation （GP- PM） for synthetic evaluation of ecological security was built. Secondly,the 6 towns of Minqin,Changning, Caiqi,Suwu,Shuangcike, Hongshaliang, and Nanhu were the main units of ecological security evaluation. Aiming to better ecological security,the ecological security evaluation system of Minqin including 15 inde- xes was set up in the perspective of the pressure of ecological resources, the quality of ecological resources, and the improving competence of ecological resources, Finally, the paper evaluated the 6 towns by genetic projection pursuit interpolation model. [Result] The results illustrated that the extent of desertification was critical. Changning, Suwu, and Hongshaliang were relative unsafe, Shuangcike and Nanhu were unsafe, and Caiqi was approximate unsafe. Generally, ecological system of Minqin was unsafe. [Conclusion] The re-sult of ecological evaluation by genetic projection pursuit interpolation model is objective and rational.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2013年第1期118-124,共7页
Journal of Northwest A&F University(Natural Science Edition)
基金
国家自然科学基金项目(30970478)
关键词
投影寻踪
插值
生态安全评价
民勤县
projection pursuit
interpolation technique
evaluation of ecological security
Minqin
