以辽源市为研究区,基于研究区1993年、2007年的Landsat 5 TM遥感影像和2021年的Landsat 8 OLI遥感影像,定量分析了研究区近30年以来的植被覆盖度(FVC)及遥感生态指数(RSEI)的变化情况和生态环境质量变化情况.结果显示,1993年、2007年和2021年辽源市植被覆盖度(FVC)分别为0.672、0.784和0.803,遥感生态指数(RSEI)分别为0.592、0.688和0.694,均呈现出先大幅增加后小幅增加的趋势.研究结果表明,辽源市近30年以来的生态环境质量在逐渐变好,除城市建设扩张和其他人类活动导致的部分区域生态环境质量变差外,其他大部分区域的生态环境质量均呈现逐渐变好的趋势.时空差异分析表明,2007年之后辽源市FVC和RSEI的变化幅度变小,FVC和RSEI不变区域面积增加,不变区域面积增加是生态环境改善的基础,这些不变区域将是辽源市未来生态环境改善的潜力区域.
Taking Liaoyuan City as the study area,based on Landsat 5 TM remote sensing images in 1993 and 2007 and Landsat 8 OLI remote sensing images in 2021,the changes of fractional vegetation cover(FVC),remote sensing ecological index(RSEI)and eco-environmental quality in the study area in the past 30 years were quantitatively analyzed.The results show that the fractional vegetation cover(FVC)in Liaoyuan were 0.672,0.784 and 0.803,and the remote sensing ecological index(RSEI)were 0.592,0.688 and 0.694,respectively in 1993,2007 and 2021,showing a trend of large increase first and then small increase.The results indicate that the ecological environment quality in Liaoyuan City had gradually improved in the past 30 years.Except for the ecological environment deterioration in some regions caused by urban construction expansion and other human activities,the ecological environment quality in most other regions had gradually improved.The results of spatio-temporal difference analysis show that the variation range of FVC and RSEI in Liaoyuan City decreased after 2007,while the area of FVC and RSEI invariant areas increased.The increase of invariant areas is the basis of ecological environment improvement,and these invariant areas will be potential areas for the improvement of the ecological environment in Liaoyuan City in the future.