| Cite this article: | 吕凯,段颖丹,吴伯志.降雨强度和秸秆覆盖对坡耕地烤烟降雨入渗特征的影响[J].灌溉排水学报,0,():-. |
| lvkai,duanyindan,WU Bozhi.降雨强度和秸秆覆盖对坡耕地烤烟降雨入渗特征的影响[J].灌溉排水学报,0,():-. |
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| Effects of Rainfall Intensity and Straw Mulching on Rainfall Infiltration of Flue-cured Tobacco in Slope Farmland |
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lvkai1, duanyindan2, WU Bozhi3
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1.Faculty of Agronomy and Biotechnology, Yunnan Agriculture University;2.College of Agronomy and Biotechnology,Yunnan Agriculture University;3.Yunnan Agriculture University
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| Abstract: |
| Abstract：【Objective】Effects of rainfall intensity and straw mulching on rainfall infiltration were discussed to provide a theoretical basis for improving rainwater use efficiency and controlling soil erosion of slope farmland.【Method】The experiment was conducted by rainfall simulator, which was designed by three factors (rainfall intensity, straw rate and LAI) and used flue-cured tobacco as material , rainfall intensity and straw rate were conducted by three (40 mm/h, 80 mm/h and 120 mm/h) and four levels (0 kg/hm2, 3 750 kg/hm2, 7 500 kg/hm2 and 15 000 kg/hm2), respectively. The infiltration rate was measured during the flue-cured tobacco growth periods.【Result】Infiltration rate decreased with rainfall duration, and finally tended towards stability. As the straw rate increased, the steady time of infiltration rate was shorter, and fluctuated gently. Meanwhile, the average infiltration rate was positively significantly related to rainfall intensity and straw rate, and it had significant difference under different rainfall intensities. Although canopy coverage could increase significantly average infiltration rate under no straw mulching, it made infiltration rate decrease when straw rate was especially up to 7 500 kg/hm2 and 15 000 kg/hm2. Furthermore, the optimal regression equation of average infiltration rate was established on rainfall intensity, straw rate and LAI by stepwise regression analysis, the coefficient of determination (R2) was up to 0.834, and the fitness of the equation reached a very significant level.【Conclusion】Rainfall intensity, straw mulching and canopy of flue-cured tobacco are the key factors which affect rainfall infiltration of slope farmland. Straw mulching or canopy of flue-cured tobacco can increase rainfall infiltration respectively, but both of them are together, the straw mulching is the major factor on infiltration rate at the same rainfall intensity. |
| Key words: straw mulching;flue-cured tobacco;leaf area index;infiltration rate;slope land |
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