京津风沙源区生态环境质量遥感评价模型

自京津风沙源治理工程启动以来,北京市及周边地区生态环境质量有所好转,急需科学合理的评价方法对工程效果进行评价。在前人研究的基础上,结合京津风沙源区的特殊情况,建立了一套京津风沙源区生态环境质量遥感评价体系,同时采用改进的特尔菲法,分析比较了两组专家打分的均值和标准差,引入权衡系数a,能够根据不同的评价角度确定各评价因子的权值,建立了适于京津风沙源区的生态环境质量遥感评价模型。该模型对研究区的综合评价得分值为4.13,符合该区域的实际情况,而采用传统的荒漠化遥感定量模型评价时,结果为轻度荒漠化面积所占比例为28%,中度荒漠化面积所占比例为35%,夸大了研究区生态环境恶化的程度。

Remote Sensing Evaluation Model of Ecological Environment Quality for Beijing-Tianjin Sandstorm Source Area

The quality of ecological environment in Beijing City and its surrounding areas has been improved since the Beijing-Tianjin sandstorm source control project was launched.And a scientific and reasonable method is needed urgently to evaluate the effects of the project.A remote sensing evaluation system for ecological environment quality was established based on previous research foundation and special circumstances in Beijing-Tianjin sandstorm source area.The improved Delphi method was employe,and a weigh coefficient was introduced.By comparing the mean value and standard deviation of the number of points given by two groups of experts,the weights of evaluation factors could be determined according to different evaluation perspective.Based on this,the remote sensing evaluation model of ecological environment quality suitable for Beijing-Tianjin sandstorm source area was established.Evaluation scroce calculated from the established model for the study region was 4.13,which corresponded with the current level of this region.However,evaluation results from the traditional remote sensing quantitative model showed that mild desertification area account for 28% and moderate desertification area account for 35%,which exaggerated the deterioration degree of ecological environment in study region.