保护性耕作措施防治农田土壤风蚀的风洞测定OA

To investigate the synergistic mechanisms of three conservation tillage practices,namely no-till,stub-ble retention,and straw mulching,in controlling farmland wind erosion,and to establish an optimized allocation framework grounded in the physical processes of wind-sand movement that balances windbreak performance with resource efficiency,this study conducted in situ experiments using a mobile direct-blow wind tunnel in a se-verely wind-eroded area of Dengkou County,Inner Mongolia.Eleven treatments were tested:no-till bare soil(control);the local practice of no-till with 10 cm stubble retention;no-till with 10 cm stubble combined with 40%,50%,or 60%straw coverage;no-till with 20 cm stubble combined with 40%,50%,or 60%straw coverage;and no-till with 30 cm stubble combined with 40%,50%,or 60%straw coverage.Wind field characteristics,com-prehensive windbreak efficacy,vertical distribution of near-surface sediment transport flux,and the relative signif-icance of factors governing sediment transport flux were quantified across all treatments.The results show that protective measures markedly altered near-surface wind field structure and wind-sand flow patterns.Stubble height was the dominant factor controlling near-surface wind field structure and played a primary role in reducing wind erosion.At 50%coverage,straw mulching achieved an effective balance between resource utilization and windbreak performance.Among the factors examined,contributions to sediment transport flux followed the or-der:wind speed>stubble height>straw mulching coverage.At 60%coverage,straw mulching effectively sup-pressed particle entrainment and transport even under extreme wind conditions.Overall,the integrated strategy of no-till cultivation combined with 30 cm stubble retention and 50%-60%straw mulching demonstrates strong effi-cacy in mitigating agricultural wind erosion and offers a scalable reference for wind erosion management and corn production in arid farming regions.