Ecological Risk Assessment Of Eastern Ordos Plateau Based On Land Use Change

Since the 21 st century,the problem of regional ecological environment health has become increasingly prominent,and regional ecological risk assessment has gradually become an important part of environmental science research.In recent years,with the acceleration of urbanization and industrialization,the change of land use structure has an increasingly significant impact on the ecological environment,and the study of land use ecological risk has gradually become an important topic and hot issue in the field of regional ecological risk research.Since the18 th CPC National Congress,China has vigorously promoted the construction of ecological civilization and implemented the concept of green development.To protect the ecological environment and promote the sustainable management of the natural ecosystem is the inevitable requirement for our country to adhere to the road of sustainable development.Zhungeer banner is located in the east of Ordos Plateau,and its ecological environment is fragile and sensitive.In recent years,due to the significant interference of human activities,land use change is particularly significant.Therefore,this study takes Zhungeer banner asthe research object,through the interpretation of the three phases of remote sensing image data in 2000,2010 and 2018 in the research area,obtains the three phases of land use data,and on this basis,uses dynamic degree and information Entropy model and density mapping are used to analyze the characteristics of land use change in the study area from 2000 to 2018.Based on the multiple risk sources,multiple risk receptors and multiple risk effects of land use,this paper selects the ecological risk evaluation indexes,constructs a comprehensive ecological risk evaluation model,evaluates the ecological risk of Zhungeer banner,further analyzes the correlation between land use change and ecological risk according to the evaluation results,and finally puts forward some management countermeasures and suggestions.The main conclusions are as follows:(1)From 2000 to 2018,the land use types of Zhungeer banner are mainly grassland and forest land,and the single land use dynamic degree of construction land,forest land and unused land is relatively high;the information entropy of land use structure shows a trend of rising first and then declining,and the spatial difference is significant;the hot areas of land use change in the 18 years are concentrated in the north,East,South,southwest and southeast of the study area.(2)From 2000 to 2018,the high-risk source areas in Jungar banner are concentrated in the north of the banner,In the middle,South and southwest of China,the risk of risk sources increased first and thendecreased.The low risk sources are widely distributed in the whole region,and the area is expanding.In 2000,the high value area of risk receptor was mainly distributed in the north and central part of the banner,while the low value area was distributed in the northern desert and the southern hilly and gully area.In2010,the high value area of risk receptor was significantly reduced,and some areas were turned into low value areas.In 2018,the overall change range of risk coefficient was relatively small.In 2000,the study area was mainly distributed with low-risk effect,and the high value was concentrated in the area with high vegetation coverage in the middle.In the past 18 years,the high-risk effect area spread on the basis of the original distribution,and the low-risk effect area increased rapidly in the central and southern mining areas.In 2000,the comprehensive ecological risk of the study area was mainly medium and low ecological risk,and the high ecological risk was mainly distributed in the northern plain and the central gully valley.By2018,the high value areas of ecological risk coefficient were significantly reduced,and the areas of low and low ecological risk areas were increased.(3)There is a significant correlation between land use change and ecological risk.The response elasticity of ecological risk to land-use change shows obvious time-space differentiation;the information entropyof land-use structure and ecological risk index in the study area show a certain positive correlation,with a correlation coefficient of 0.375;the distribution of hot spots of land-use change in Zhungeer banner is mostly consistent with that of high and high risk areas,indicating that there is a strong relationship between land-use change and ecological risk in Zhungeer banner The relevance of.In this study,the results of land use ecological risk assessment and the control measures proposed for each ecological risk zone can provide certain theoretical and decision support for Zhungeer banner ecological risk management,comprehensive management of ecosystem and maintenance of regional ecological security.