科尔沁沙地防风固沙服务流路径模拟及受益区识别OACHSSCD

As an ecologically fragile region in China,the Horqin Sandy Land's enhanced windbreak and sand fixation services play a vital role in curbing desertification and ensuring ecological,production,and livelihood security in beneficiary areas.Moreover,these efforts contribute significantly to regional atmospheric environmental quality and represent a tangible local implementation of the global commitment to achieving Land Degradation Neutrality(LDN).This study employed the Revised Wind Erosion Equation(RWEQ)to assess the wind erosion modulus in the Horqin Sandy Land and used the Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)model to simulate service flow paths and identify service beneficiary areas.Subsequently,the spatial characteristics of these services were analyzed in conjunction with regional socioeconomic data to evaluate the supply-demand situation.Results indicated that from 2000 to 2020,wind erosion in the Horqin Sandy Land was dominated by micro and slight levels.During this period,the total windbreak and sand fixation services showed a fluctuating decline,while its spatial distribution revealed significant heterogeneity,increasing gradually from west to east and north to south.The flow paths of windbreak and sand fixation services mainly extended eastward and northeastward,reaching parts of China's Northeast Plain,North China Plain,and the middle-lower Yangtze River Plain,and also crossed national borders into Russia,Mongolia,South Korea,North Korea,Japan,and the Philippines.This extensive trans-regional and trans-national transmission highlights the significant long-distance telecoupling effects and positive externalities of the Horqin Sandy Land's ecosystem services.The extent of service benefits decreased in concentric zones centered on the Horqin Sandy Land,exhibiting a gradient pattern that declined from west to east and from south to north.A spatial mismatch was observed between the service beneficiary frequency ranges and the corresponding socioeconomic conditions.Specifically,the mid-and high-frequency beneficiary areas are predominantly located in major grain-producing provinces,which shoulder the strategic responsibility of national food security.While generating substantial social benefits,these regions often face the opportunity cost of sacrificing implicit economic gains.In contrast,the low-frequency beneficiary zones align with densely populated economic cores.While these areas benefit less frequently,their high protection value suggests that the urgency and scale of their ecological compensation obligations are often undervalued.Ultimately,by quantitatively delineating the spatial scope and intensity of beneficiaries,this study offers a practical pathway to translate ecological service flows into actionable policy.These findings provide a robust scientific foundation for establishing a differentiated,cross-regional ecological compensation mechanism,fostering coordinated governance that balances ecological sustainability with regional socio-economic development.