The Yu-Jia Expressway(Yulin-Jiaxian Expressway)is located in the cross area of water and wind erosion of the Loess Plateau in the transition zone between the Mu Us Desert and the Loess Plateau in northern Shaanxi Province.The terrain,topography,and geological conditions of the road area are complex,and the ecological environment is fragile.Conducting an ecological environment quality evaluation of the road area is of great significance for ecological environment restoration and high-quality development of highways.By means of GIS and RS technology,the Landsat remote sensing images are selected to invert the indicators of greenness,humidity,dryness,and heat.The entropy weight method is used to construct a remote sensing ecological index model(RSEI).Based on the transfer matrix and difference method,the ecological quality of the Yu-Jia Expressway road area is evaluated and statistically analyzed.The results show that:(1)The RSEI value of the 5 km buffer zone in Yu-Jia Expressway area are 0.433 5,0.519 2 and 0.574 5 in 2007,2013 and 2019,respectively,showing an increasing trend,indicating that the ecological environment quality is generally good.The spatial trend of the highway is the transition from loess Liangmao desert low hill area to valley terrace area and loess Liangmao gully area.The ecological environment is getting better on the whole.(2)The construction of Yu-Jia Expressway has a sensitive impact on the ecological environment of the road area within a 300 meter buffer zone.During the construction period,the increase in RSEI in the 300 m buffer zone is less than that in the 5 km buffer zone,while during the operation period,the increase in RSEI in the 300 m buffer zone is greater than that in the 5 km buffer zone.This indicates that Yu-Jia Expressway has a negative impact on the ecological environment of the road area during the highway construction period,and the ecological environment of the road area can be restored during the operation period.(3)From the analysis of RSEI spatiotemporal data in sensitive areas at different periods,it can be seen that during the construction and operation periods of the Yu-Jia Expressway,the area where the ecological environment level turns positive is more than the area where it turns negative,indicating that the overall ecological environment in the Yu-Jia Expressway area is developing well.However,the extent of improvement during the construction period is lower than that during the operation period,with a difference of 7.1 km2,indicating that the ecological environment restoration degree of the Yu-Jia Expressway during the operation period is greater than the negative impact on the ecological environment during the construction period.
关键词
路域生态环境/RSEI/熵权法/转移矩阵
Key words
road area ecological environment/RSEI/entropy weight method/transition matrix
维普
万方数据