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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Variation in the vertical zonality of erodibility and critical shear stress of rill erosion in China's Hengduan Mountains
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Variation in the vertical zonality of erodibility and critical shear stress of rill erosion in China's Hengduan Mountains

机译：中国横断山区泥浆腐蚀垂直区分和临界剪切应力的变化

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Soil erodibility is an essential parameter used in soil erosion prediction. This study selected the Liangshan town watershed to quantify variation in the vertical zonality of rill erodibility (k(r)) in China's ecologically fragile Hengduan Mountains. Soil types comprised of yellow-brown (soil A), purple (soil B), and dry-red (soil C) in a descending order of occurrence from the summit to the valley, which roughly corresponds to the vertical climate zone (i.e. cool-high mountain, warm-low mountain, and dry-hot valley sections) of the study area. With elevation, vertical soil zonality varied in both soil organic matter (SOM) content and soil particle-size fractions. A series of rill erosion-based scour experiments were conducted, using water discharge rates of 100, 200, 300, 400, 500, and 600 mL min(-1). Additionally, detachment rates (Dr) were measured under three hydrological conditions (the drainage, saturation, and seepage treatments). Results show that both Dr and flow shear stress (&) values increased as discharge increased. As elevation increased, the k(r) values decreased, while the vertical zonality of critical shear stress (&(c)) values showed no obvious variation. The highest k(r) values were observed during the seepage treatment, followed by the saturation treatment then drainage treatment, indicating that variation in vertical hydraulic gradients could significantly alter k(r) values. This study also found that land-use types could also alter k(r) and &(c) values. Further research, however, is necessary to better quantify the effects of subsurface hydrological conditions and land-use types on k(r) under different soil zonalities in China's Hengduan Mountains. (c) 2018 John Wiley & Sons, Ltd.
机译：土壤蚀是土壤侵蚀预测中使用的必要参数。本研究选择了凉山镇流域，量化了中国生态脆弱横断山脉垂直间隔的垂直间隔（K（r））的变化。土壤类型以黄褐色（土壤A），紫色（土壤B）和干红（土壤C）组成，其发生从山谷的峰会到山谷的发生量，大致对应于垂直气候区（即冷却 - 高山，温暖的低山和干热谷段）的研究区。用升高，垂直土壤间距在土壤有机物质（SOM）含量和土壤粒度分数中变化。采用100,200,300,400,500和600mL min（-1）的排水速率进行了一系列基于佝偻病的冲刷实验。另外，在三种水文条件下测量分离速率（DR）（引流，饱和度和渗流处理）。结果表明，由于放电增加，DR和流量剪切应力（＆）值增加。随着升高增加，K（R）值降低，而临界剪切应力（＆（c））值的垂直间隔显示没有明显的变化。在渗流处理期间观察到最高的K（R）值，然后在饱和处理中进行排水处理，表明垂直液压梯度的变化可以显着改变K（R）值。本研究还发现，土地使用类型也可以改变K（R）和（C）值。然而，进一步的研究是为了更好地量化地下水文条件和土地利用类型在中国恒源山不同土壤分解下的k（r）的影响。 （c）2018 John Wiley＆Sons，Ltd。

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