| Xuebaoding(5588 m),the main peak of Minshan Mountain,and its surrounding areas are typical areas in southwest mountainous areas with double vulnerability of mountain ecosystem and karst ecosystem,but there is no unified scope to be determined in previous studies.How to scientifically and reasonably determine the natural area of Xuebaoding and its surrounding areas and carry out ecological geological environment assessment is of great practical significance for the rational allocation of resources,the optimization of land use and the realization of sustainable development in this area.The main contents of this paper include:(1)The boundary of Xuebaoding Watershed was obtained by spatial superposition analysis of small watershed units extracted from Arc GIS hydrological analysis module and natural characteristic factors in this region.On this basis,the spatial distribution characteristics of travertine deposition points,a unique ecological-geological tourism resource in Xuebaoding watershed,were analyzed.(2)Taking Landsat remote sensing images from 2002 to 2019 and geological hazard data from 2004 to 2015 as data sources,the evolution of landscape pattern,vegetation cover and its changes,and the development of geological hazard in Xuebaoding Watershed were analyzed and studied.To a certain extent,the changes of ecological geological environment and the overall situation of the study area were explored.(3)Building Xuebaoding Watershed ecological-geological environment quality evaluation system,using AHP as evaluation model to determine the index weight,and obtained the ecological-geological environment quality evaluation results of the study area.In order to further clarify the spatial pattern differentiation characteristics of eco-geological environment quality in Xuebaoding Watershed,ESDA method was introduced to analyze and discuss it.;(4)Taking the core scenic area of Huanglong as an example,the ecological-geological environment stability of individual travertine landscapes were evaluated.The results are as follows:(1)The total area of Xuebaoding Watershed is 6988.97 km~2,and the geographical location is 103°25’59"～104°17’12"E,32°26’11"～33°28’51"N;(2)Forestland,shrub and grassland occupy the absolute dominance in the landscape of Xuebaoding Watershed,and the landscape is strongly disturbed by natural factors,but weakly disturbed by human factors.(3)The vegetation coverage in Xuebaoding Watershed is"low in the middle and high around",and the dynamic attitude of vegetation coverage is strong,which is mainly manifested by the large annual change of the area with high vegetation coverage and the continuous decline of the area with stable vegetation coverage level.(4)Most of the geological hazards in Xuebaoding Watershed are linearly distributed along the main stream of rivers and fault zones,and concentrated in the strata interbedded with weaker rock groups and harder rock groups.(5)The overall quality of the ecological-geological environment in the Xuebaoding Watershed is mainly good and relatively good,accounting for nearly 60%of the total area.while the area of the poor ecological-geological environment quality is the smallest,and the spatial distribution of ecological-geological environment quality is seriously polarized,showing significant positive agglomeration characteristics.(6)The ecological-geological environment stability of single travertine landscape in Huanglong core scenic spot is mainly stable and basically stable,and only the Jie Xianqiao is unstable. |
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