To reveal the spatiotemporal pattern and evolution heterogeneity of ecological land over a long period and serve the eco-logical protection and high-quality development of the Yellow River Basin,this study conducted the related investigations using meth-odology of land use tracking technology,center of gravity migration trajectory,and standard deviation ellipse,based on the land use data in 1980,1990,2000,2010 and 2020.The results showed that:①Ecological land in Yellow River Basin was mainly distributed in the up-per and middle regions,accounting for 69.770％-70.411％of the total land covers,and land quantity structure displayed an"N"tendency.Wherein,grassland and unused land showed a decreasing tendency,but forest and water areas displayed an increasing tenden-cy.The transformation of ecological land was mainly characterized by the mutual transformations among grassland,forest land,unused land,and cultivated land in the upper region.②Obviously temporal and spatial differences in the changes towards different lands were observed,along with that spatial dynamic degree of forest land displayed a circuitous migration feature,while grassland showed a spatial feature of"agglomeration-dispersion-agglomeration".Meanwhile,water area changed evenly with high dynamic attitude moving southward and unused land varied greatly in the middle reaches of the study area.③Migration trajectory of ecological land was triangu-lar,with a distance of 40.643 km and a direction of northwest,but the center of gravity still located within Wuzhong City.Elliptical vari-ation of standard deviation reflected an unstable pattern,with undergoing a fluctuating growth process of first contracting,then expan-ding,and again.
关键词
生态用地/时空格局/遥感/弦图/黄河流域
Key words
ecological land/spatial-temporal pattern/remote sensing/chord diagram/Yellow River Basin
万方数据