熵权模糊物元模型在土地生态安全动态评价中的应用

Application of Entropy Weight Fuzzy Matter-element Model in Dynamic Evaluation of Land Ecological Security

土地生态安全的影响层面广,受到国家高度重视,科学的生态安全评价方法对于评价结果的准确性和正确性尤为重要。应用熵权模糊物元分析法对皖江地区土地生态安全进行评价。结果发现:近年来皖江各市的土地生态安全等级逐渐上升,至2015年基本都处于向"理想安全"级别转化的状态,但还只是一种正在转化的状态,具有不稳定性,生态安全问题绝不能因此而忽视。对皖江地区土地生态安全影响的限制性因子主要为单位面积耕地化肥负荷、单位面积耕地农药负荷、土地自然受灾受害面积以及工业废气处理率,而具体到各个市以及各个年份表现却有一定的差别。但总体看,各市影响因子数量在减少。因此,通过熵权模糊物元模型可以客观反映制约土地生态安全健康发展的障碍因子,能对生态安全进行相对准确的动态评价,但评价指标的选择对区域生态安全评价结果具有一定的影响。

The impact level of land ecological security is extensive,which is highly valued by the state.The scientific evaluation methods of ecological safety are extremely important for the accuracy and correctness of the evaluation results.Entropy weight matter element analysis method was used to study land ecological security of Wanjiang area.The results showed that:the city's land ecological security level had gradually increased in recent years,basically in the transformation to “ideal security”to 2015.Such transformation was unstable.Thus the ecological security could never be ignored. The limiting factors affecting land ecological safety of Wanjiang area mainly included fertilizer load per unit arable land,pesticide load per unit arable land,natural disaster area and industrial waste gas treatment rate.There were some differences among those factors varies in different countries and years.But in general,the number of influencing factors in each city was decreasing.Therefore ,entropy weight fuzzy matter-element model can objectively reflect the obstacle factors restricting the healthy development of land ecological security,and can make relatively accurate dynamic assessment of ecological safety.However,the selection of evaluation indicators has a certain impact on regional ecological security evaluation.