[1]ZHU Qiming,WANG Ning,LIU June,et al.Soil Water Erosion Changes and Driving Factors in Ecologically Fragile Areas in Northern Shaanxi Province[J].Research of Soil and Water Conservation,2023,30(05):41-51,60.[doi:10.13869/j.cnki.rswc.2023.05.006.]
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Soil Water Erosion Changes and Driving Factors in Ecologically Fragile Areas in Northern Shaanxi Province
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 05
Page number:
41-51,60
Column:
Public date:
2023-08-10
- Title:
- Soil Water Erosion Changes and Driving Factors in Ecologically Fragile Areas in Northern Shaanxi Province
- Keywords:
- RUSLE model; Yulin; Geodetector; spatial and temporal variation
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.05.006.
- Abstract:
- [Objective] The aims of this study are to analyze the spatial and temporal characteristics of soil water erosion in ecologically fragile areas of northern Shaanxi Province and elucidate the driving factors affecting the spatial distribution pattern of soil water erosion, with a view to providing some theoretical basis for soil water erosion management and ecological restoration in ecologically fragile areas of the Loess Plateau. [Methods] Based on modified universal soil loss equation(RUSLE)model, multi-source data such as precipitation, soil properties, topography and remote sensing were selected to estimate soil water erosion in Yulin in 2000, 2010 and 2020 in order to carry out a study on the spatial and temporal variation and driving factors of soil water erosion in Yulin. [Results] Slight erosion dominated in Yulin in 2000, 2010 and 2020. Compared with 2000, the area of Yulin with intensity erosion and above significantly reduced in 2010 and 2020. Soil water erosion rate was higher in the southern part of Yulin than the northern part, where soil water erosion was more serious in the southern part locally. Soil water erosion in 2010(5.339×107 t)decreased significantly compared with 2000(1.124×108 t), while water erosion in 2020(6.864×107 t)increased slightly compared with 2010(5.339×107 t)due to the increase in erosive power of rainfall in Yulin in recent years. The loss caused by water erosion was more serious in the southwest part and southeast region of Yulin than in the north, especially in Dingbian, which contributed 44.68%, 16.69%, and 14.66% of soil losses of Yulin caused by water erosion in three years, respectively. The moderate intensity and below contributed more to the soil water erosion loss in Yulin. The main factors driving the differences in the spatial distribution of soil water erosion formation in Yulin were topography and rainfall, and the interaction of different factors increased the influence on the degree of water erosion, and there were also more obvious differences in the driving factors between different geomorphic zones. In 2000 and 2010, the risk of intense water erosion was highest in the sandy steep slopes of the mountains with 40%～50% cover in eastern Yulin, while the highest risk of intense soil water erosion in 2020 was in the sandy plain areas with 30%～40% cover. [Conclusion] The soil water erosion condition in Yulin had changed during the years 2000, 2010 and 2020, and the distribution pattern of water erosion was mainly driven by topography and rainfall factors, and further optimization of model factors is needed in the future to improve the accuracy of model prediction for sub-moderate erosion intensity.
- References:
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Last Update:
2023-08-10