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[1]LI Hua-tan,ZHAO Yu-jiao,LI Guo-rong,et al.Experimental Research on Slope Protection with Vegetation under Situ Rainfall Simulation in Cold and Arid Environment of Loess Area[J].Research of Soil and Water Conservation,2014,21(06):304-311.

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Experimental Research on Slope Protection with Vegetation under Situ Rainfall Simulation in Cold and Arid Environment of Loess Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 06 Page number: 304-311 Column: Public date: 2014-12-28

Title:: Experimental Research on Slope Protection with Vegetation under Situ Rainfall Simulation in Cold and Arid Environment of Loess Area

Author(s):: LI Hua-tan¹, ZHAO Yu-jiao¹, LI Guo-rong¹, HU Xia-song^1,2, LU Hai-jing¹, ZHU Hai-li¹; 1. Department of Geological Engineering, Qinghai University, Xi’ning 810016, China;
2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xi’ning 810008, China

Keywords:: loess area; vegetation slope; rainfall simulation; runoff; soil erosion

CLC:: P642.5

DOI:: -

Abstract:: To study the hydrological effects of slope protection with vegetation, we carried out the method of situ rainfall simulation on the slopes covered by two shrubs Caragana korshinskii Kom, Zygophyllum xanthonylon (Bunge) Maxim and on the slopes planted with 2 herbs Elymus nutans Griseb, Agropyron trachycaulum (Linn.) Gaertn, as well as on the control slopes without vegetation under the same test conditions. The results show that the stable runoff and sediment flux of the bare slope under the same test conditions are relatively bigger, the values are 450.0～475.0 ml/min and 8.28～8.36 g/min, respectively; the stable runoff and sediment fluxes of the slopes planted with Zygophyllum xanthonylon, Caragana korshinskii are 307.0～355.5 ml/min and 3.12～4.07 g/min, respectively; the stable runoff and sediment fluxes of the slopes planted with Agropyron trachycaulum, Elymus nutans are 24.0～41.3 ml/min and 1.52～2.40 g/min, respectively. The data show that stable runoff and sediment flux are negatively related with slope vegetation coverage. Further studies show that the stable runoff and sediment flux of the slopes planted with herbs are significantly less than the slopes planted with shrubs, and the stable runoff and sediment flux of the slopes planted with shrubs is 1.338～1.466 times, 2.054～2.654 times of the slopes planted with herbs. The the increment rates of soil moisture contents in the layer(0—20 cm) and the layer(20—40 cm) are 38.94% and 11.08%, respectively; at the same depth, the increment rates of soil moisture contents of the slopes covered with Caragana korshinskii, Zygophyllum xanthonylon are 42.24%～44.19% and 10.63%～11.76%, respectively; and those of the slopes planted with Elymus nutans, Agropyron trachycaulum of at the same depth are 47.27%～48.11% and 13.98%～14.74%, respectively; the soil moisture content change in the layer (40—60 cm) is not significant. The data show that planting vegetation in the slopes can effectively prevent and reduce the slope runoff generation during the process of rainfall infiltration, and the effect of herb is more significant than that of the shrub in terms of reducing the runoff yield. The runoff coefficient of bare slope is 63.40%, for slopes planted with Caragana korshinskii and Zygophyllum xanthonylon the runoff coefficients are 18.00% and 20.33%, respectively and for slopes planted with Agropyron trachycaulum and Elymus nutans are 6.57% and 1.71%, respectively. The runoff coefficient of the slopes with herbs is relatively less than that of the slopes with shrubs, which indicates that the inhibitory role of herbs in resisting rain erosion and soil erosion and surface runoff is more significant than shrubs.

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