干旱区绿洲城市生态变化遥感评价--以武威市凉州区为例

Remote Sensing Evaluation of Urban Ecological Changes in Arid Region Oasis-taking the Liangzhou District in Wuwei as an Example

利用主成分分析法耦合4个生态评价指标(绿度、湿度、干度和热度)构建遥感生态指数(RSEI),对干旱区绿洲城市武威市凉州区2000年~2016年的生态环境质量进行评价。结果表明:基于主成分分析的遥感生态指数能客观定量揭示区域生态变化,RSEI均值由从0.447提高到0.458,整体提高了2.46%;武威市凉州区生态环境质量整体稍有改善但变化不大,生态环境质量等级由中等向两极化发展,东北荒漠区大面积开垦耕地使得生态环境有所改善,中部地区城市扩展和新区建设使生态环境质量下降,西南部山区受人为扰动少,生态状况基本不变。

The principal component analysis method was used to couple four ecological evaluation indicators(greenness,humidity,dryness,and heat)to construct a remote sensing ecological index(RSEI),and the ecological environment quality of Liangzhou District of Wuwei City in the arid area from 2000 to 2016 was is evaluated.The results show that the ecological index of remote sensing based on principal component analysis can objectively quantify regional ecological changes;the overall ecological environment quality in Liangzhou District of Wuwei is slightly improved but did not change much,the average RSEI raised from 0.447 to 0.458,and the overall increased 2.46%.District Eco-environmental Quality Grades from Medium to Two Polarized Development.The large-scale cultivation of arable land in the northeastern desert area has improved the ecological environment.The expansion of urban areas and the construction of new areas in the central region have reduced the quality of the ecological environment.The mountainous area in the southwest is less affected by man-made disturbances,and the ecological status is basically unchanged.