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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Sheet erosion rates and erosion control on steep rangelands in loess regions
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Sheet erosion rates and erosion control on steep rangelands in loess regions

机译：黄土地区陡峭牧场的薄板侵蚀率和侵蚀控制

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Numerous steep rangelands have been restored from abandoned steep croplands, and sheet erosion has become the dominant erosion process on rangelands since the Grain-to-Green Project was launched in 1999 on the Loess Plateau. Quantifying sheet erosion rates and dynamics on steep rangelands may aid soil erosion management strategies and improve grassland health. Simulated rainfall experiments were conducted on a rangeland plot under five vegetation coverages (30%, 40%, 50%, 60% and 70%), five rainfall intensities (0.7, 1.0, 1.5, 2.0 and 2.5mmmin(-1)) and five slopes (7 degrees, 10 degrees, 15 degrees, 20 degrees and 25 degrees). The results show that the sheet erosion rate decreased as vegetation cover increased, as described by linear or logarithmic equations under different rainfall intensities or slopes. Herbaceous vegetation can reduce and control sheet erosion by reducing the effect of rainfall intensity or slope, especially under sufficiently high vegetation cover. The sheet erosion rate was accurately modelled by a linear equation that included the three factors, i.e. rainfall intensity, vegetation cover, and slope. Among the different hydrodynamic parameters (shear stress, stream power, unit stream power and unit energy), stream power resulted in the best model for the sheet erosion rate. Velocity measurements and calculations, water depth calculations, and aggregative indicators of herbaceous vegetation for sheet flow should be explored in future research, which will be important in improving experimental accuracy and sheet erosion modelling. (c) 2018 John Wiley & Sons, Ltd.
机译：众多陡峭的牧场已经从废弃的陡峭耕地恢复，由于谷物到绿色项目于1999年在黄土高原启动，因此薄板侵蚀已成为牧场的主导侵蚀过程。陡峭牧场的量表侵蚀率和动力学可能有助于土壤侵蚀管理策略，提高草原健康。在五个植被覆盖范围内进行模拟降雨实验（30％，40％，50％，60％和70％），五次降雨强度（0.7,1.0,1.5,2.0和2.5mmmin（-1））和五个斜坡（7度，10度，15度，20度和25度）。结果表明，随着植被覆盖的增加，片材侵蚀率降低，如不同的降雨强度或斜坡下的线性或对数方程所描述的。通过降低降雨强度或坡度的影响，特别是在足够高的植被覆盖下，草本植物可以减少和控制片侵蚀。通过包括三个因素的线性方程准确地建模了片侵蚀速率，即降雨强度，植被覆盖和坡度。在不同的流体动力学参数（剪切应力，流功率，单位流动力和单位能量）中，流功率导致了片材侵蚀率的最佳模型。在未来的研究中，应探讨速度测量和计算，水深计算，水深计算，水深计算，水深计算和草本植物的植被的聚集指标，这对于提高实验准确性和片材侵蚀建模将是重要的。 （c）2018 John Wiley＆Sons，Ltd。

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