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| DOI：10.13522/j.cnki.ggps.2019201 |
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| Effect of Rainfall Intensity and Straw Mulching on Infiltration of Rainfall into Slope Planted with Flue-cured Tobacco |
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LYU Kai, DUAN Yingdan, WU Bozhi
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Faculty of Agronomy and Biotechnology, Yunnan Agriculture University, Kunming 650201, China
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| Abstract: |
| 【Objective】Water infiltration is an important hydrological process impacting and being impacted by many biotic and abiotic factors and processes. In this paper we experimentally studied how rainfall intensity and straw mulching in separation or coupling impact rainfall infiltration into a slope planted with flue-cured tobacco.【Method】The experiment was conducted in a slope using a rainfall simulator. We compared three rainfall intensities (40, 80 and 120 mm/h) and four straw mulches (0, 3 750, 7 500 and 15 000 kg/hm2). The infiltration rate and leaf area index (LAI) of the tobacco were measured during different growth stages of the tobacco.【Result】Infiltration rate decreased asymptotically with time in a rainfall event before reaching a constant, and increasing straw mulching reduced the time required for the infiltration to reach steady state. Average infiltration rate was positively related to both rainfall intensity and straw mulching at significant level, but varied between different rainfall intensities at significant level. Canopy could significantly increase average infiltration rate in soil without straw mulching, but it could made water difficult to infiltrate when the soil was mulched with straw at 7 500 kg/hm2 and 15 000 kg/hm2. A stepwise regression model was derived to link average infiltration rate to rainfall intensity, straw mulching rate and LAI, with a coefficient of determination (R2) of 0.834.【Conclusion】Rainfall intensity, straw mulching and canopy are key factors modulating rainfall infiltration into slope planted with flue-cured tobacco. Rainfall infiltration can be enhanced by straw mulching and canopy in separation, while under their coupling, the impact of straw mulching was more significant. |
| Key words: straw mulching; flue-cured tobacco; leaf area index; rain infiltration; slope farmland |
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