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| DOI：10.13522/j.cnki.ggps.20170018 |
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| Using the Green-Ampt Model to Analyze Enhanced Infiltration in Slope Corn Field in the Loess Plateau |
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WANG Jian, MA Fan, MENG Qinqian, MA Yuhong, WU Faqi
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1.Northwest A & F University, Yangling 712100, China; 2.Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750000, China; 3. Xi’an Water and Soil Conservation Station, Xi’an 710000, China
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| Abstract: |
| 【Objective】 Cropping alters soil structure and hence hydrological cycle. This paper aimed to study the influence of corns planted in slope on water infiltration and the water use efficiency. 【Method】 The experiment was conducted on a slope with slope angle of 3° to 15°; the infiltration of an artificial rainfall was measured. The infiltration process was simulated using the Green-Ampt model, and the steady infiltration rate was determined based on the infiltration rate measured at the late stage of the experiment. We also calculated water deficit parameter of the root zone soil and derived soil water infiltration processes based on the surface-runoff time and the precipitation intensity. 【Result】 The corn field intercepted precipitation and thus delayed the occurrence of surface runoff. The capacity of the interception increased gradually as the corn grew. The efficacy of the tasseling period in reducing surface runoff was most notable, with the average runoff time delayed from 4.69 min to 17.98 min. The cumulative infiltration before runoff occurred was higher than that on a bare surface, increasing by 20.46%, 130.91%, 272.54%, and 235.93% respectively on the seedling, jointing, tasseling and late tasseling stages. The cumulative infiltration in the corn field was also higher than that on a bare surface, increasing by 2.44%, 6.33%, 31.01% and 24.13% respectively on the above four growth stages. Planting corn increased soil hydraulic conductivity, thus improving its infiltration capacity and soil water content, compared to bare soil surface.【Conclusion】 The Green-Ampt model is able to simulate water infiltration in the slope planted with corn and the calculated infiltration rate can match with the measured date despite a slight overestimation because the model does not consider the surface compaction induced by raindrops. |
| Key words: rainfall infiltration; sloping land; corn; Loess Plateau |
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