Integrated evaluation of ecological sensitivity and its spatiotemporal evolution characteristics of karst mountainous cities
[Objective]This study aims to reveal the ecological sensitivity and spatiotemporal evolution characteristics in Guiyang from 2000 to 2020,to enrich the systematic research framework of the ecological sensitivity,and to provide scientific evidence for the'ecological city'and the construction of an ecological civilization city in Guiyang.[Methods]Based on the ecological and environmental issues of karst ecosystems in Guiyang and the strategic development needs of a strong provincial capital city,an integrated ecological sensitivity evaluation system was constructed using four dimensions:soil erosion sensitivity,desertification sensitivity,biodiversity sensitivity and human disturbance sensitivity.GIS technology and spatial autocorrelation analysis were employed to reveal their spatiotemporal evolution characteristics.[Results](1)The overall ecological sensitivity of Guiyang was primarily mild,with the area of mild sensitivity increasing from 65.19％in 2000 to 75.65％in 2020,showing an overall upward trend,while the proportion of moderately sensitive and higher-grade areas had decreased,indicating an improvement in Guiyang's ecological environment.(2)The majority of moderately sensitive and higher-grade areas were located in the southeastern and southwestern parts of Huaxi District,the eastern and northeastern parts of Kaiyang County,the central part of Xifeng County,and the western parts of Xiuwen County and Qingzhen City,with a fluctuating and narrowing trend in distribution,while other areas had relatively lower sensitivity.(3)During the study period,the sensitivity levels of various dimensions in Guiyang varied and did not change synchronously.Desertification sensitivity was high and showed a decreasing trend,soil erosion sensitivity was relatively high with significant variability,human disturbance sensitivity was generally increasing,and biodiversity sensitivity was low with relatively slow changes.(4)The global Moran's I indices of the comprehensive ecological sensitivity for five time points from 2000 to 2020 in Guiyang were 0.737,0.799,0.773,0.733 and 0.680,respectively.Ecological sensitivity showed a positive spatial autocorrelation and the correlation had weakened over time.The distribution characteristics were dominated by high-high and low-low clustering,but the degree of aggregation was weakening,indicating a trend towards spatial dispersion in the distribution of ecological sensitivity.[Conclusion]The ecological sensitivity in Guiyang was primarily mild and the proportion of this level was increasing,while the area of moderately sensitive and higher-grade areas were decreasing,suggesting that the ecological condition of Guiyang had been well maintained and the ecological environment in moderately sensitive and higher-grade areas had been improved.
ecological sensitivityspatiotemporal evolutionspatial autocorrelationkarst mountainous cityGuiyang City
万方数据
维普
