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Spatial Heterogeneity of Surface Roughness on Tilled Loess Slopes in Erosion Stages

机译：侵蚀阶段耕种黄土斜坡上表面粗糙度的空间异质性

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摘要

The main soil erosion areas of the Chinese Loess Plateau are tilled slopes. The knowledge of their spatial heterogeneity will contribute to the understanding of erosion mechanisms on a microtopographic scale. In this study, the spatial heterogeneity of four conventionally tilled slopes was examined under simulated rainfall conditions using a semivariogram-based methodological framework. Results show that all tilled slopes have a relatively stable spatial structure and the erosion stages of all tilled slopes have a similar spatial variability. The rainfall in the splash, sheet, and rill erosion stages has a degree of relief effect, strengthening effect, and relief effect on the surface roughness, respectively. However, the effects of tillage practices and slope gradient on the spatial heterogeneity are much larger than those of the rainfall. The spatial heterogeneity decreases with increasing slope gradient. The general autocorrelation scale of the tilled slopes is 3.15 m and their fractal dimension ranges from 1.59 to 1.85. The tilled slopes have certain anisotropy with respect to the slope direction from 10 degrees to 22.5 degrees while they show isotropy or weaker anisotropy in other directions. In this work, a semivariogram-based methodological framework was established for the spatial heterogeneity of microtopographic-scale slopes. The results also provide a theoretical foundation for future tillage measures on sloping fields of the Loess Plateau.
机译：中国黄土高原的主要土壤侵蚀地区是倾斜斜坡。他们的空间异质性的知识将有助于了解微选显尺度的侵蚀机制。在这项研究中，使用基于半造型图的方法框架在模拟降雨条件下检查了四种常规耕地斜面的空间异质性。结果表明，所有耕地斜坡都具有相对稳定的空间结构，所有耕地斜率的侵蚀阶段都具有类似的空间变异性。在飞溅，床单和岩浆侵蚀阶段的降雨量分别具有浮雕效果，强化效果和对表面粗糙度的浮雕影响。然而，耕作实践和坡度梯度对空间异质性的影响远大于降雨量。空间异质性随着坡度梯度的增加而降低。耕种斜坡的一般自相关规模为3.15米，分形尺寸范围为1.59至1.85。耕地倾斜的倾斜方向与10度到22.5度的倾斜方向有一定的各向异性，同时在其他方向上显示各向同性或较弱的各向异性。在这项工作中，建立了基于半运动的方法论框架，用于微选级斜坡的空间异质性。结果还为黄土高原倾斜田地的未来耕作措施提供了理论基础。

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