2000-2022年庆阳市土地利用与植被覆盖时空变化及影响因素OA

The evolution law of land/vegetation cover in arid areas has become a very important topic in the field of science.Based on land use data and the normalized difference vegetation index,this paper explores the spatio-temporal evolution characteristics and influencing factors of land use and vegetation cover in Qingyang City,Gan-su,China,from 2000 to 2022 using a pixel dichotomy model,land use change methods,Sen+Mann-Kendall trend analysis,and multivariate residual analysis.The results showed the following:(1)Land types in Qingyang City were dominated by grassland and cultivated land.Over the past 20 years,the areas of forest land,grassland,and construction land increased considerably,whereas those of cultivated land and shrubland decreased considerably.The primary transitions involved the conversion of cultivated land to grassland and forest land,the conversion of cultivated land and grassland to construction land,and a gradual increase in the transfer of forest land area to cul-tivated land and grassland.(2)Fractional vegetation coverage(FVC)in Qingyang City was low in the northwest and high in the southeast;the overall level was moderately low but showed a pronounced improvement trend.Trend analysis indicated that the area exhibiting an increasing trend(79.66%)far exceeded the area with a de-creasing trend(8.08%),and FVC changes reflected the combined effects of urbanization and policies across dif-ferent historical periods.(3)FVC improvement in Qingyang City was primarily driven by climate change and hu-man activities,with human activities exerting a stronger influence.FVC improvement is closely linked to the im-plementation of ecological restoration projects.The results of this study can provide a theoretical reference for ecological construction and sustainable development in Qingyang City.