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[1]Gao Yifeng,Han Lei,Huo Hong,et al.Study on Spatial and Temporal Variations of Soil Erosion in Typical Farmland Conversion Area Based on Topographic Gradient[J].Research of Soil and Water Conservation,2024,31(03):30-41,48.[doi:10.13869/j.cnki.rswc.2024.03.030]

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Study on Spatial and Temporal Variations of Soil Erosion in Typical Farmland Conversion Area Based on Topographic Gradient

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 03 Page number: 30-41,48 Column: Public date: 2024-04-30

Title:: Study on Spatial and Temporal Variations of Soil Erosion in Typical Farmland Conversion Area Based on Topographic Gradient

Author(s):: Gao Yifeng¹, Han Lei^2,3,4, Huo Hong⁵, Zhao Zilin¹, Chang Yuqing¹, Liu Zhao², Cao Xinxin¹, Yang Meili¹, Li Yabei¹; (1.School of Earth Science and Resources, Chang'an University, Xi'an 710054, China; 2.School of Land Engineering, Chang'an University, Xi'an 710054, China; 3.Shaanxi Key Laboratory of Land Reclamation Engineering, Xi'an 710054, China; 4.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China; 5.Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China)

Keywords:: soil erosion; RUSLE; LMDI; CA-Markov; Yan 'an City

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.03.030

Abstract:: [Objective] The aims of this study are to explore the characteristics of spatial and temporal dynamics of soil erosion in typical farmland conversion area under different topographic conditions before and after the ‘Grain for Green' project, and to provide scientific support for consolidating project results. [Methods] The RUSLE model was used to quantitatively analyze the spatial and temporal evolution characteristics of soil erosion intensity in Yan'an City from 1989 to 2019, and the distribution patterns of soil erosion on various elevations and slopes were explored in combination with topographic factors. The precipitation, vegetation and soil and water conservation factor affecting the change of soil erosion modulus were decomposed by the LMDI model and their contribution values were analyzed. The CA-Markov model was used to predict the soil erosion status of Yan'an City in 2029. [Results] The average soil erosion modulus in Yan'an City in 1989, 1999, 2009 and 2019 were 12 554.80 t/(km²·a), 8 237.17 t/(km²·a), 5 936.57 t/(km²·a)and 4 473.02 t/(km²·a), respectively. The erosion type was dominated by slight erosion, showing the spatial differentiation characteristics of low level in the south and high level in the north. The soil erosion intensity generally decreased with the increase of elevation, but the erosion increased at the fifth elevation. The soil erosion intensity was consistent with the slope gradient, and the erosion intensity increased with the increase of slope gradient. The inhibitory effect of vegetation factor and soil and water conservation factor on soil erosion had increased in recent years. The soil erosion situation in Yan'an City will be generally improved in 2029. [Conclusion] The soil erosion status in Yan'an City has improved significantly, but there is still the increased erosion in some areas. In the future, the high-altitude areas in the north and the bank areas of the Yellow River in the east of Yan'an City should be given more attention, meanwhile, the monitoring of high-slope areas should be strengthened.

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Last Update: 2024-04-30