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[1]ZHANG Li,ZHANG Qing-feng,XU Jian,et al.Study on the Spatial Heterogeneity of Soil Surface Roughness during the Course of Water Erosion[J].Research of Soil and Water Conservation,2014,21(02):6-10,16.

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Study on the Spatial Heterogeneity of Soil Surface Roughness during the Course of Water Erosion

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 02 Page number: 6-10,16 Column: Public date: 2014-04-28

Title:: Study on the Spatial Heterogeneity of Soil Surface Roughness during the Course of Water Erosion

Author(s):: ZHANG Li¹, ZHANG Qing-feng^1,2, XU Jian³, ZHANG Xiang¹; 1. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China;
3. Petrochina Changqing Oilfield Company, Xi’an 710018, China

Keywords:: surface roughness; spatial heterogeneity; GIS; geostatistics; fractal dimension

CLC:: S157

DOI:: -

Abstract:: Surface roughness is one of the most important factors affecting soil erosion process, and is also the hotspot in research filed of soil erosion. Exactly grasping the spatial heterogeneity of surface roughness in water erosion process is of significance for further understanding the process of soil erosion. This paper took the surface roughness of artificial backhoe cultivated in loess plateau as research objects, analyzed the spatial heterogeneity of surface roughness during the development of soil erosion from the stages of before rain (BR), splash erosion (SpE), sheet erosion (ShE) to rill erosion (RE) by the method of geostatistics and Geographical Information System (GIS) technique under the micro-scale (2 cm×2 cm) conditions.The results showed that the surface roughness at all stages of soil erosion presented a weak variation. Analysis of variance of theoretical variogram models showed that before rain (BR) and splash erosion (SpE) followed exponential model, sheet erosion (ShE) followed spherical model, and rill erosion (RE) followed Gaussian model. In terms of spatial structure, each stage of soil erosion all showed moderate spatial autocorrelation. The spatial heterogeneity was resulted from both structural factors and random factors. The autocorrelation distance of the stage of before rain (BR), splash erosion (SpE), sheet erosion (ShE) and rill erosion were 0.46 m，0.28 m，1.29 m and 1.04 m, respectively. Fractal dimension analysis showed that the spatial variability of surface roughness in the different process of water erosion mainly occurred on the smaller scales. The results can offer a foundation for revealing the coupling relationship between surface roughness and soil erosion in the process of water erosion.

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