SPATIO-TEMPORAL DISTRIBUTION CHARACTERISTICS OF VEGETA-TION UNDER THE INFLUENCE OF TRAFFIC ENGINEERING DISTURB-ANCE IN ARID DESERT AREA—TAKING JIA'AN EXPRESSWAY IN SHULE RIVER BASIN AS AN EXAMPLE
The disturbance effect of traffic engineering construction on vegetation in arid desert areas is a scientific issue worthy of attention.The Shule River Basin,located in the Hexi Corridor,was chosen as the research area,and the vegetation along the Jia'an Expressway was taken as the research object.Remote sensing interpretation,GIS spatial analysis,and other methods were used to analyze the temporal and spatial distribution characteristics of veg-etation and land coverage.The disturbance effect of highway construction on vegetation was identified,and the dis-turbance range of highway construction on vegetation was analyzed quantitatively.Moreover,the response character-istics of different land cover types to road construction disturbances are analyzed.The results show that:(1)From 2000 to 2019,the proportion of desert areas in the Shule River Basin showed a decreasing trend,and vegetation coverage showed an improving trend.(2)The area of"cropland,""grassland,""sparse vegetation,""wetlands,"and"impervious surfaces"in the study area all increased,while the proportion of"bare areas"showed a downward trend,decreasing from 83.97％in 2000 to 77.55％in 2019.(3)The construction of the expressway significantly changed the vegetation landscape pattern along the line,leading to a significant increase in the differentiation level of vegetation coverage.The difference between the maximum and minimum vegetation coverage increased from 0.013(before highway construction)to 0.033.(4)During the construction of the Jia'an Expressway,the disturb-ance range to the vegetation was within 60 m,causing the vegetation on both sides to show a"zonal"feature,and the intensity of the disturbance decreased with the increase of the"distance from the highway,"which conformed to the relationship of the logarithmic equation.(5)Under the disturbance of expressway construction,the vegetation degradation intensity of different land cover types is different,and the degradation intensity of"impervious sur-faces,""cropland,""grassland,""wetland,""sparse vegetation,"and"bare areas"gradually weakened,and the I_road were-0.216,-0.127,-0.112,-0.112,-0.095,and-0.007,respectively.The research results of this paper help to better understand the disturbance effect of road engineering on vegetation and can provide a quantita-tive reference for models related to road planning and evaluation.
ExpresswayEngineering disturbanceVegetation coverageEdge effectLand cover type
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