首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Combining 3D data and traditional soil erosion assessment techniques to study the effect of a vegetation cover gradient on hillslope runoff and soil erosion in a semi-arid catchment
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Combining 3D data and traditional soil erosion assessment techniques to study the effect of a vegetation cover gradient on hillslope runoff and soil erosion in a semi-arid catchment

机译:结合3D数据和传统土壤侵蚀评估技术研究植被覆盖梯度对半干旱集水区山坡径流和土壤侵蚀的影响

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In this paper, we examine the effect of vegetation on soil erosion, runoff generation and sediment transport on saline rangeland hillslopes. Rainfall simulations were conducted at a fixed 114 mm/h intensity on 6 m x 2 m erosion plots with varying degrees of vegetation. Plots were grouped into three categories (L, M and H) based on their canopy cover (L: & 5%, M: 5-19%, H: & 19%) and selected to limit variations in slope across canopy cover groups. Runoff and sediment samples were combined with three dimensional (3D) reconstruction data used to monitor soil surface microtopographic changes. Runoff initiation was significantly delayed on the L plots but cumulative runoff after 20 min of rainfall simulation indicated a positive effect of vegetation on infiltration processes. Cumulative sediment after 20 min of rainfall was similar across vegetation cover categories. The 3D data suggest that vegetation reduced net sediment delivery from the plots by primarily increasing opportunities for deposition while marginally affecting gross soil erosion. Plots with H vegetation cover experienced lower 3Destimated erosion volumes but average erosion depth on L plots was lower than that on plots with M and H vegetation covers. Lower runoff volumes on M and H plots may have been compensated by greater runoff erosivity on these plots as runoff was concentrated in a narrower inter-patch space compared to L plots. This study highlights the need for an increased integration between traditional runoff measurement techniques and 3D reconstruction methods.
机译:在本文中,我们研究了植物对盐水岭山坡土壤侵蚀,径流发电和沉积物运输的影响。降雨模拟以固定的114mm / h强度进行6米×2米侵蚀地块,具有不同程度的植被。基于它们的遮篷覆盖(L:& 5%,M:5-19%,H:& 19%)分为三类(L,M和H)分为三类(L,M和H)分组为三类(L,M和H)分为三类(L,M和H)。选择限制变化跨越顶篷覆盖团的坡度。径流和沉积物样本与用于监测土壤表面微相变化的三维(3D)重建数据组合。在降雨模拟20分钟后,L径流显着延迟,但累计径流表明植被在渗透过程中的积极作用。在降雨20分钟后累积沉积物在植被覆盖范围内相似。 3D数据表明,植被通过主要增加沉积机会,从沉积机会施加沉积时减少了净沉积物递送。具有H植被覆盖的绘图经历了较低的3D潜在的侵蚀体积,但L图的平均侵蚀深度低于M和H植被封面的图。在M和H图上的较低径流卷可能已经通过这些绘图的更大径流腐蚀性来补偿,因为径流集中在与L图相比较窄的帧间间隔空间中。本研究突出了在传统径流测量技术与3D重建方法之间增加集成的需求。

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