民勤绿洲生态系统适宜程度指标体系的构建

在探讨生态系统适宜性概念的基础上,以民勤荒漠绿洲为研究对象,采用层次分析法确定了5个准则层和19个指标的权重系数。综合相关文献及国内外现行标准,制定出各参评指标分级标准范围,运用综合指标法构建了民勤荒漠绿洲生态系统适宜程度识别指标体系,并对2010年到2015年的生态系统适宜性进行综合评价。结果表明,6年的适宜性综合得分值分别为32.73、37.84、50.73、58.22、75.23、80.79,适宜程度从2010年的低分值不适宜程度过渡到2013年的稳定程度再到2015年低分值较适宜程度,综合得分增长率高峰分别是2012年的25.41%和2014年的22.61%,2015年增速放缓,增长率下降为6.88%。通过对各指标层的分析,得出水文水资源对生态适宜程度的影响最大,生态建设次之。

Construction of suitability indicator system of Minqin oasis ecosystem

On the basis of exploring the concept of ecosystem suitability, we took Minqin Desert Oasis as the research object and established 5 criteria layers and the weight coefficients of 19 indicators using analytic hierarchy process(AHP). By using other study results and current domestic and international standards, the evaluation index system of the suitability classification of Minqin desert oasis ecosystem was constructed, then, the ecosystem suitability for the period from 2010 to 2015 was comprehensively evaluated. The results showed that the comprehensive scores were 32.73, 37.84, 50.73, 58.22, 75.23, and 80.79 for the 6 years, respectively.The suitability increased from the low score/not suitable in 2010 to a relative stable score in 2013,then, to more suitable status in 2015. The highest growth rate in the score was 25.41% in 2012 and 22.61% in 2014, and the growth rate slowed down to 6.88% in 2015. Through the analysis of each indicator layer, it is concluded that local hydrology and water resources have the greatest impact on the suitability of ecosystem and the second factor is ecosystem construction.