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| Effects of straw returning on runoff hydrodynamic characteristics of black soil hillslopes |
| Received:April 02, 2025 |
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| KeyWord:black soil region;hydrodynamic parameter;corn straw;soybean straw;straw returning rate;slope gradient |
| Author Name | Affiliation | E-mail | | TIAN Li | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun 130118, China | | | LU Guijun | Jilin Provincial Research Institute of Water and Soil Conservation, Changchun 130033, China | | | LI Hongli | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun 130118, China | | | CHE Xiaocui | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun 130118, China | | | MOU Tingsen | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun 130118, China | | | WU Jialong | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun 130118, China | | | SHEN Haiou | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun 130118, China | shenhaiou@jlau.edu.cn |
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| Abstract: |
| The simulated rainfall experiments were conducted under different slope gradients(3°, 5°, and 7°)with corn straw returning(0, 25%, 50%, 75%, and 100%)and soybean straw returning(0, 100%)to investigate the effects of different crop straw returning and returning rates on the runoff hydrodynamic characteristics of black soil hillslopes. The rainfall intensity was 75 mm·h-1. The results showed that both corn and soybean straw significantly reduced the runoff velocity, Froude number, and unit stream power, increased the resistance coefficient and runoff shear force, but had no significant regulation influence on Reynolds number and stream power compared with no straw returning. Among them, soybean straw exhibited the most notable increase in the resistance coefficient on gentle slope gradients such as 3°, whereas corn straw showed a more obvious effect on steep slope gradients such as 5° and 7°. Furthermore, corn straw had a more significant influence on runoff hydrodynamic characteristics than that of soybean straw. For corn straw returning treatments, runoff velocity, Froude number, and unit stream power decreased with an increase in straw returning rates. Specifically, the mean runoff velocity decreased by 57.1%-66.7%, and the Froude number and unit stream power decreased by 50.0%-72.1%. The reductions in Reynolds number and stream power decreased within 25.0%. In addition, the resistance coefficient and runoff shear force increased with an increase in straw returning rates. Additionally, the 50% straw returning rate had the most significant regulation effect on Reynolds number and stream power for all hillslopes with different slope gradients, as well as on runoff velocity for the hillslope with 5° slope gradient. Overall, greater straw returning rates(50%-100%)had a more substantial effect on runoff hydrodynamic characteristics. Therefore, it is necessary to combine with local slope gradients and select suitable crop straw types and straw returning rates for agricultural production practice of black soil hillslopes to apply the straw returning technology. |
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