Land use change and ecological risk assessment of the urban agglomerations in the Yellow River Basin
Five national urban agglomerations in the Yellow River Basin were selected as the research objects in this paper,and the land use changes from 1990 to 2020 were reviewed in combination with six land use types.The ecological risk index was used to analyze and evaluate the regional ecological risk and its evolution characteristics.The study found that in the past 30 years in the urban agglomeration area,the reduction of grassland except cultivated land was the most obvious,which decreased by 16778km2 and 7976km2 respectively.The overall proportion of low-risk areas increased by 7.1％and the proportion of high-risk areas was basically stable,and the overall ecological risk was in a good trend.However,the proportion of high-risk areas in the Jiziwan metropolitan area has increased by about 5％and is the largest compared to other urban agglomerations.As the core of the Lanzhou-Xining urban agglomeration,the high-risk areas of Lanzhou City have been further expanded,and new high-risk areas have emerged in the Central Plains urban agglomeration and the Shandong Peninsula urban agglomeration in the past 10years.In this regard,this paper proposes to formulate and improve the countermeasures for the differential control of land space in the urban agglomeration of the Yellow River Basin.Aiming at the existing and potential high-risk areas,the coordinated control of land use and ecological risk should be carried out,and the protection and restoration of cultivated land,grassland,and forest land should be further strengthened.
the Yellow River Basinurban agglomerationecological risk assessmentland usecooperative control
万方数据
维普
