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Study on the Evolution of Land Use Landscape Pattern and Ecological Risk Evaluation in Aral Reclamation AreaCN



Abstract:In recent years,people have been clearing and expanding land,which has intensified the conflict between people and land.The analysis and research of regional land use/ cover changes and its related contents can not only explore the dynamic changes of land use types on the earth’s surface,but also reproduce the effects of human activities on land use change.It can provide scientific guidance for regional landscape ecological construction,environmental protection,ecological civilization construction and the healthy and orderly development of ecological environment.As a typical artificial oasis in Northwest China,the Alar reclamation area is not only an important ecological barrier to hinder the northward migration of the Taklimakan Desert,but also a significant member of the strategy for large-scale development of western China and the Belt and Road Initiative,which plays a core role in promoting the ecological civilization construction and economic development in southern Xinjiang.The lack of fresh water resources on the surface of the reclamation area,the serious phenomenon of soil salinization,and the blind reclamation of land resources with the increasing population have led to a series of ecological and environmental problems.The study of the evolution of land use landscape patterns and ecological risks in the Aral Reclamation Area can provide some ideas for food security,rational development and use of soil and water resources and land use restructuring in the Reclamation Area.Therefore,based on 259 Landsat remote sensing image data(the spatial resolution is 30×30 m)and relevant statistical data of Alar reclamation area from 1990 to 2019,this paper carried out multi-temporal remote sensing image fusion with the support of SPSS,ENVI,e Cognition,Arc GIS,GIS+,Fragstats and Geo DA.After comparing the accuracy of different classification algorithms,the best classification method was selected for land classification.Combining classical landscape ecology and spatial geostatistics algorithms,the dynamic changes of land use/cover in the Alar Reclamation Area over a long time series from 1990 to 2019 were then analysed,the driving factors for the changes in the cultivated land area in the Reclamation Area were explored,the evolution of the landscape pattern was carried out A study was conducted to evaluate the regional ecological risks in the Aral Reclamation Area,revealing the spatial change patterns and spatial correlations of ecological risks in the Reclamation Area.The findings show that:(1)Comparison of different classification methods: By comparing the accuracy of three classification algorithms: multi-temporal object-oriented,multi-temporal image-based and single-temporal object-oriented,the results show that the multi-temporal object-oriented algorithm has the best classification result(overall accuracy OA is 0.96,Kappa coefficient is 0.95),and the multi-temporal object-oriented classification algorithm can avoid the "misclassification" and "missclassification" as much as possible on the basis of the support vector machine classification algorithm which has a high classification accuracy.The multi-temporal object-oriented classification algorithm can avoid the phenomenon of "wrong classification" and "missing classification" as far as possible,thus improving the classification accuracy.(2)The spatial and temporal evolution of land use in the Aral Reclamation area: the area of arable land,garden land,water bodies and construction land in the Aral Reclamation area has shown a general trend of continuous increase in the last 30 years,while the area of forest and grassland and unused land has shown a decreasing trend;the conversion between the various land use types is frequent and mainly occurs in the areas along the Tarim River and in the northwestern part of the Reclamation area;the areas where arable land has decreased are mainly located in the areas along the Tarim River,and arable land Arable land has been converted mainly into parkland and woodland.(3)Drivers of arable land area change in Aral Reclamation: The main drivers of arable land area change in Aral Reclamation over the last 30 years are total population,primary industry and cotton price.These three main driving factors had a positive impact on the total cultivated land area in the study area,and the primary industry had the largest driving force for the increase in cultivated land area.(4)Characteristics of the evolution of the landscape pattern in Aral Reclamation: at the level of patch types,the landscape of arable land in Aral Reclamation tends to be fragmented and the landscape of water bodies and building land tends to be balanced from 1990 to 2019.From the perspective of landscape level,the richness and heterogeneity of landscape increased in Alar reclamation area.For 30 consecutive years,the landscape pattern changed dramatically in 2005,and landscape fragmentation,complexity and diversity increased significantly,while landscape connectivity decreased.In Alar reclamation area,the spatial distribution of landscape indexes along the Tarim river was relatively uniform,human activities were frequent and landscape structure was perfect.The landscape pattern spread from the coastal area of Tarim River to remote areas,and the trend of expansion was more obvious in the northeast and southwest directions.(5)Characteristics of ecological risk assessment in Alar reclamation area: In 1990,the Aral reclamation area was dominated by unused land of high ecological risk,and by 2000 the areas of high ecological risk were significantly reduced,with lower risk areas extending outwards from their original locations;by 2019 there was a trend towards medium to low risk areas with arable land as the landscape type.The area along the banks and the north-western part of the reclamation area.From 1990 to 2019,the global Moran’s index of Alar reclamation area is positive,and the overall trend is increasing.The high-high agglomerations show a spatial trend of contraction from the outside to the inside,and the low-low agglomerations show a spatial trend of diffusion from the central area to the outside.Based on the above research,this paper systematically analyses the land use/cover changes in the Alar Reclamation Area during 1990-2019,explores the evolution process of the landscape pattern in the Reclamation Area,and constructs ecological risk evaluation indicators based on the landscape pattern index to evaluate and analyse the ecological risk in the Reclamation Area,with a view to providing reference for monitoring land information and rational use of land resources in the Alar Reclamation Area.It is intended to provide reference for monitoring land information and rational use of land resources in the Aral Reclamation Area.
  • Series:

    (B) Chemistry/ Metallurgy/ Environment/ Mine Industry; (J) Economics & Management

  • Subject:

    Environment Science and Resources Utilization; Agriculture Economy

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