[1]LONG Tianyu,LIU Jinhui,LIU Xiangzhang,et al.Effects of Surface Mulching on Interflow and Nitrate Migration Process in a Sloping Farmland of Purple Soil[J].Research of Soil and Water Conservation,2018,25(06):68-73.
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Effects of Surface Mulching on Interflow and Nitrate Migration Process in a Sloping Farmland of Purple Soil
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 06
Page number:
68-73
Column:
Public date:
2018-10-26
- Title:
- Effects of Surface Mulching on Interflow and Nitrate Migration Process in a Sloping Farmland of Purple Soil
- CLC:
- X501
- DOI:
- -
- Abstract:
- For two kinds of surface conditions of sloping farmland of purple soil with topsoil crust and straw mulching under different slope gradients, the three-dimensional convective-dispersion model of nutrient leaching was established, the temporal and spatial distributions of interflow and nitrate concentration had been simulated numerically, and influences of surface mulching on interflow and nitrate migration process were studied. The results showed that, for topsoil crust, the rate and steady strength of interflow as well as the nitrate loss in the soil decreased due to reduction of water infiltration, while the situation for the straw mulch was opposite. For three hours rainfall with intensity of 30 mm/h, when slope gradients are 5°, 10°, 15°, 20° and 25°, respectively, for topsoil crust, the rate at outlet decreased by 34.8%~43.0%, and the nitrate loss in the soil decreased by 8.6%~34.4%. However, for the straw mulch, the rate increased by 8.6%~12.6%, and the nitrate loss increased by 8.6%~15.4%. For the purple soil slope farmland, the appropriate measures should be taken to keep the water and fertilizer under the conditions of using straw mulch to increase infiltration.
- References:
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