基于遥感技术的通辽陆地生态系统碳水利用效率特征研究OA

[Objective]To elucidate the spatiotemporal dynamics of carbon and water cycles in terres-trial ecosystems of Tongliao,as well as the efficiency variations among different ecosystem types,with the aim of providing theoretical support for ecological conservation and sustainable development in arid and semi-arid regions.[Method]Based on MODIS data on gross primary production(GPP),net primary production(NPP),and evapotranspiration(ET),along with ecosystem classification data,the carbon use efficiency(CUE)and water use efficiency(WUE)indices were calculated using the ratio method to quantitatively analyze the spatiotemporal distribution characteristics of carbon and water use efficiency across various ecosystems in Tongliao.[Result]From 2010 to 2022,CUE of Tongliao's terrestrial ecosys-tems fluctuated between 0.32 and 0.83,with a mean value of 0.58,exhibiting a trend of"initial in-crease,followed by a decrease,and then a slight rise".WUE fluctuated within the range of 0.18 to 1.32 g·C·mm-1·m-2,with an average of 0.77 g·C·mm-1·m-2,exhibiting irregular fluctuations.High-value regions for both CUE and WUE were concentrated in the northern and southern mountainous areas,whereas low-value zones were distributed in the southern sandy regions and the central saline-alkali lands.Among the four ecosystem types,grassland ecosystems demonstrated the highest perform-ance,with the greatest CUE and WUE values and relatively smooth fluctuations.[Conclusion]The spati-otemporal differentiation of carbon and water use efficiency in Tongliao's terrestrial ecosystems is signifi-cant,influenced by topography,vegetation type,and human activities.These findings provide a scientific basis for subsequent policy formulation related to regional ecological restoration,land use plan-ning,and climate change adaptive management.