Abstract：[Background] Sloping farmland is the main type of cultivated landand and also the main source of soil erosion in the karst mountain area of southwest China. Previous studies have not yet fully revealed the law of soil erosion in the karst sloping farmland, especially the influence of rainfall intensity and underground pore fissure degree on the runoff and sediment yield of sloping farmland. The proportion of surface and underground soil erosion of the total erosion in the karst sloping farmland is not clear.[Methods] In this paper, limestone soil, a representative soil in karst regin, was selected as the research soil sample, and the runoff and sediment yield characteristics of slope farmland under different rainfall intensity and underground pore fissure degree were studied by artificial rainfall simulation method. The double-layer structure of rocky desertification slope farmland in the field was simulated by drilling steel trough on the floor, and the soil was filled in three layers. One rainfall lasted for 30 min, and samples were collected and replaced every 3 minutes. The runoff was measured by measuring cylinder and sediment yield was measured by drying method. The experimental data processing was mainly completed by Excel 2013, and the mapping was completed by Origin 9.1.[Results] During the light rainfall intensity (30 mm/h), there was no runoff and sediment generated in the rocky desertification sloping farmland in karst area, mainly underground leakage. The influence of rainfall intensity on the surface runoff and sediment yield of sloping farmland was significantly positive, and the influence of underground pore fissure degree on runoff and sediment yield was significantly positive. In the case of surface runoff, the proportion of underground runoff was 35.87%-80.32%, and the proportion of underground sediment was 18.47%-72.08%. The variation trend of runoff with the rainfall duration was as follows:the overall performance increased first and then tended to stabilize of runoff yield, while the sediment yield varied with rainfall intensity and underground pore fissure degree.[Conclusions] Rainfall intensity is the main factor affecting soil and water loss of slopes in the rocky desertification area. More attention for soil erosion control should be paid to underground leakage for the slope in the rocky desertification area. Hence it can be considered to reduce soil erosion by maintaining or increasing vegetation cover on those slopes. The results may provide a theoretical reference for karst rocky desertification control and ecological restoration.
王玉红, 高儒学, 戴全厚, 甘艺贤, 姚一文. 喀斯特区石漠化坡耕地产流产沙模拟试验[J]. 中国水土保持科学, 2021, 19(4): 78-86.
WANG Yuhong, GAO Ruxue, DAI Quanhou, GAN Yixian, YAO Yiwen. Simulation experiment on runoff and sediment yield in sloping farmland in the rocky desertification of karst region. SSWC, 2021, 19(4): 78-86.
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2021, Vol. 19 
