链谱视角下干旱海湾国家土地利用变化特征及驱动因子分析OA

To comprehensively understand the spatiotemporal characteristics and dynamic mechanisms of land-use change and to provide decision-making references for the sustainable management of land resources,this study employed the land-use chain spectrum analysis method integrated with the Geodimeter model on the Google Earth Engine platform to investigate land-use change and its driving mechanisms in Qatar,a gulf country in arid regions.The key conclusions are as follows:From 1995 to 2020,land-use change in Qatar exhibited a re-duction in sandy land,continuous expansion of cultivated land and impervious surfaces,and a notable increase in the proportion of sparse vegetation and shrubland.Doha,the capital of Qatar,functioned as a"super expansion center"for impervious surfaces,with its development pattern transitioning from infill expansion to outward ex-pansion,while other port cities demonstrated an alternating expansion mode of infill and outward expansion.Irri-gated cultivated land constituted the primary type of cultivated land expansion,forming a dual-axis expansion pat-tern centered on the northeastern coast and extending toward the northwest and southwest.The expansion of eco-logical land was dominated by sparse vegetation and shrubland,with 1995-2000 and 2015-2020 serving as the key expansion periods.Spatially,a greening circular structure dominated by sparse vegetation,with the coastal zone as the core,was formed.Shrubland was distributed in clumps owing to resource constraints,with a more prominent agglomeration effect along the eastern coast.Land use change in Qatar exhibited a"dual-track mecha-nism"characterized by oil-and gas-economy-driven growth coupled with water resource constraints.Specifical-ly,during 1995-2005,population density served as the core driving force;however,after 2005,the driving mod-el shifted to an economic expansion pattern dominated by GDP and the nighttime light index,superimposed with the constraining effect of groundwater resources.For future development,it is essential to strengthen the coordi-nated development mechanism of"water resource constraint-economic transformation-ecological restoration"and to adopt water-saving technologies as the foundation for achieving a dynamic balance between urban expan-sion and ecological protection.