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| Experiment on effect ofrock fragment cover on slope erodibility of saline-sodic soil in costal reclamation area |
| WANG Hongde1,2, XU Xiaoming3, SHE Dongli1,2 |
| 1. Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; 2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3. Liyang Bieqiao Water Conservancy Station, Liyang, Jiangsu 213300, China |
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Abstract The effects of rock fragments cover(RC)on the saline-sodic soil erosion and the interrill erodibility were investigated through simulated rainfall with two intensities(92 mm/h, 119 mm/h), two slope gradients(15%, 30%), and six rock fragments covers(0%, 10%, 20%, 40%, 60% and 80%). Results showed that with the increase of cumulative rainfall, the soil erodibility increased first, then decreased and tended to be stable. The soil erodibility was significantly increased with slope gra-dient. The soil erodibility varied non-monotonically with RC. In the condition of deeper slope and lower RC, soil erodibility increased with RC; while infiltration rate increased, runoff rate and soil erodibility decreased with RC when RC was higher. The appropriate RC could change the roughness of slope surface and reduce the soil erodibility. A significant negative linear correlation existed between Reynolds number of runoff and soil erodibility on the slope with rock fragments cover. Quantitative analysis of li-near relationship between Reynolds number and soil erodibility can reflect hydrodynamics process of saline-sodic soil on slope surface, which is of significance to building a prediction model of sediment transport in saline-sodic soil slope.
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Received: 24 November 2017
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| [1]朱伟, 谢三桃,阮爱东,等. 碎石覆盖对河流硬质护坡土壤抗侵蚀性及植物生长的影响[J]. 应用生态学报, 2008, 19(3):634-640. ZHU Wei, XIE Santao, RUAN Aidong, et al. Effects of gravel mulch technology on soil erosion resistance and plant growth of river flinty slope [J]. Chinese journal of applied ecology, 2008, 19(3):634-640.(in Chinese)[2]ACAULINE S, BEN-HURL M. Effects of rainfall intensity and slope gradient on the dynamics of interrill ero-sion during soil surface sealing [J]. Catena, 2006, 66(3):211-220.[3]CAO L, ZHANG K, DAI H, et al. Modeling Interrill Erosion on unpaved roads in the loess plateau of China[J]. Land degradation & development, 2015, 26(8):825-832.[4]刘青泉, 李家春, 陈力,等. 坡面流及土壤侵蚀动力学(Ⅱ)-土壤侵蚀[J]. 力学进展,2004,34(4):493-506. LIU Qingquan, LI Jiachun, CHEN Li, et al. Dynamics of overland flow and soil erosion(Ⅱ)-soil erosion [J]. Advances in mechanics, 2004, 34(4):493-506.(in Chinese)[5]FIGUEIREDO T D, POESEN J. Effects of surface rock fragment characteristics on interrill runoff and erosion of a silty loam soil[J]. Soil & tillage research, 1998, 46(1-2):81-95.[6]MANDAL U K, RAO K V, MISHRA P K, et al. Soil infiltration, runoff and sediment yield from a shallow soil with varied stone cover and intensity of rain[J]. European journal of soil science, 2005, 56(4):435-443.[7]KINNELL P. Runoff as a factor influencing experimen-tally determined interrill erodibilities[J]. Soil research, 1993, 31(3):333-342.[8]ZHANG X C, NEARING M A, NORTON L D, et al. Modeling interrill sediment delivery[J]. Soil Science Society of America journal, 1998, 62(2).[9]SUAREZ D L, WOOD J D,LESCH S M. Effect of SAR on water infiltration under a sequential rain-irrigation management system[J]. Agricultural water manage-ment, 2006, 86(1-2):150-164.[10]KIM J, IVANOV V Y. On the nonuniqueness of sedi-ment yield at the catchment scale: The effects of soil antecedent conditions and surface shield[J]. Water resources research, 2014, 50(2):1025-1045.[11]POESEN J, LAVEE H. Rock fragments in top soils: significance and processes[J]. Catena, 1994, 23(1-2):1-28.[12]和继军, 蔡强国, 刘松波. 次降雨条件下坡度对坡面产流产沙的影响[J]. 应用生态学报, 2012, 23(5):1263-1268. HE Jijun, CAI Qiangguo, LIU Songbo. Effects of slpoe gradient on slope runoff and sediment yield under different single rainfall conditions [J].Chinese journal of applied ecology, 2012, 23(5):1263-1268.(in Chinese)[13]郑加兴, 佘冬立, 徐翠兰,等. 不同雨强和坡度条件海涂盐土边坡侵蚀细沟发育过程[J]. 河海大学学报:自然科学版, 2015, 43(4):313-318. ZHENG Jiaxing, SHE Dongli, XU Cuilan, et al. Evolution process of erosion rill on saline soil slope in coastal reclamation with different rainfall intensities and slope gradients[J]. Journal of Hohai University(natural sciences), 2015, 43(4):313-318.(in Chinese)[14]张光辉. 坡面水蚀过程水动力学研究进展[J]. 水科学进展, 2001, 12(3):395-402. ZHANG Guanghui. Advances in study of runoff detachment processes based on hydraulics[J]. Advances in water science, 2001, 12(3):395-402.(in Chinese)[15]SHE D, LIU D, MENG J, et al. Hydrological responses on saline-sodic soil slopes in a coastal reclamation area of China[J]. Catena, 2016, 144:130-140.[16]LIU D, SHE D. Can rock fragment cover maintain soil and water for saline-sodic soil slopes under coastal reclamation?[J]. Catena, 2017, 151:213-224.[17]MARTíNEZ-Zavala L, JORDáN A. Effect of rock fragment cover on interrill soil erosion from bare soils in Western Andalusia, Spain[J]. Soil use & management, 2008, 24(1):108-117.[18]LORENA M Zavala, ANTONIO Jordán, Nicolás Bellinfante, et al. Relationships between rock fragment cover and soil hydrological response in a Mediterranean environment[J]. Soil science & plant nutrition, 2010, 56(1):95-104.[19]郭太龙,王全九,王力,等. 黄土坡面水力学特征参数与土壤侵蚀量间关系研究[J]. 中国水土保持科学, 2008, 6(4):7-11. GUO Tailong, WANG Quan Jiu, WANG Li, et al. Relationship between hydraulic characteristics and soil erosion amount on loess slope[J].Science of soil and water conservation,2008, 6(4):7-11.(in Chinese) |
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