黄河几字弯区生态需水格局与国家水网背景下的调控策略OA

The Yellow River's"Ji-shaped"bend region,rich in energy resources and home to diverse ethnic groups,faces ecological vulnerability and frequent natural disasters.As a central area in the Yellow River basin,its ecological and socio-economic development is severely constrained by water scarcity.This study collected the historical meteorological data,leaf area index,soil composition,and soil moisture data from 1982 to 2019,as well as future climate projections under different carbon emission scenarios,using a comprehensive calculation method that considers potential evapotranspiration,vegetation coefficient,and soil moisture coefficient to assess the spatiotemporal variation of ecological water demand in the region.The results show that ecological water demand exhibits an increasing trend over 97.16％of the area in the Yellow River's"Ji-shaped"bend region.Under medium and high carbon emission scenarios,future ecological water demand will increase further.Vegetation type significantly influences the spatial distribution of ecological water demand,with areas such as southern forests exhibiting higher leaf area indices and greater water requirements.In the context of constructing the national water network,graded planning of water supply and demand should be implemented to improve the operational efficiency of the water network.Coordinated regulation of ecological protection and water resources should be carried out to enhance the resilience and recovery capacity of ecosystems.Additionally,the promotion of water-saving technologies and green development will improve water use efficiency.It is also necessary to combine large-scale terraced fields,Yudiba dams,cellars,and water resources management in the local area to construct a"water,energy,food,and ecosystem"integrated development model and improve the efficiency of water and soil resource utilization,while strengthening drought tolerance in vegetation and ecological restoration to reduce ecological water consumption.