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EFFECTS OF UNDERGROUND PORE FISSURES ON SOIL EROSION AND SEDIMENT YIELD ON KARST SLOPES

文献类型： 外文期刊

作者： Dai, Quanhou 1 ; Peng, Xudong 1 ; Zhao, Longshan 1 ; Shao, Hongbo 2 ; Yang, Zhi 1 ;

作者机构： 1.Guizhou Univ, Coll Forestry, Guiyang 550025, Guizhou, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Biotechnol, Jiangsu Key Lab Bioresources Saline Soils, Nanjing 210014, Jiangsu, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Biotechnol, Prov Key Lab Agrobiol, Nanjing 210014, Jiangsu, Peoples R China

关键词： erosion and sediment;underground pore fissure degree;bedrock bareness rate;karst slope;simulation

期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.977； 五年影响因子：5.291 ）

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收录情况： SCI

摘要： Underground pore fissure is one of common ways of soil leakage, and the soil loss in underground pore fissure would aggravate the development of rocky desertification in karst areas. A designed steel tank with varied underground pore fissure degrees was used to measure how underground pore fissure affected soil erosion and sediment yield on karst bare slope. We found that sediment yield rates and its distribution ratios obviously differed between the surface and underground. Surface sediment yield rate greatly responded to rainfall intensity conditions, while underground sediment yield rate rarely changed. Both bed rock bareness and underground pore fissure degree had an insignificant effect on both surface and underground sediment yield rate, but the former greatly influenced sediment distribution between the surface and underground. With increasing of bed rock bareness rate, both the average surface and underground sediment yield rates first increased and then decreased. The later posed an effect on underground sediment yield rate, which increased with increase of underground pore fissure degree. With increase of underground pore fissure degree, critical rainfall intensity for producing surface sediment would increase from 0.8-1.3 mm min(-1) to 1.3-2.0 mm min(-1). The results provide a mechanistic understanding of how underground pore fissure affects soil erosion and sediment production. Copyright (C) 2017 John Wiley & Sons, Ltd.

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