[1]WANG Zhen,WU Jinhua,BAI Shuai,et al.Spatiotemporal Changes of Sloping Farmland Resources and Its Soil Erosion Effects in Yan'an City[J].Research of Soil and Water Conservation,2022,29(03):1-11.
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Spatiotemporal Changes of Sloping Farmland Resources and Its Soil Erosion Effects in Yan'an City
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 03
Page number:
1-11
Column:
Public date:
2022-04-20
- Title:
- Spatiotemporal Changes of Sloping Farmland Resources and Its Soil Erosion Effects in Yan'an City
- Keywords:
- sloping farmland; spatiotemporal changes; soil erosion; RUSLE model; geographically weighted regression model; Loess Plateau
- CLC:
- S157
- DOI:
- -
- Abstract:
- In order to study the spatiotemporal relationship between the use of sloping farmland and the change of soil erosion in the Loess Plateau, we took the sloping farmland and soil erosion intensity in Yan'an City as the research object, and used sloping farmland dynamic, land use transfer matrix, kernel density analysis, RUSLE model, geographically weighted regression model, etc, to clarify the spatiotemporal evolution of sloping farmland and soil erosion intensity, and the soil erosion effect brought by spatiotemporal changes of sloping farmland was revealed. The results show that:(1)from 1990 to 2018, the total area of sloping farmland in Yan'an City experienced a change of ‘rise→decrease→decrease', and the overall dynamic degree of slope farmland was -0.68%/a; from 1990 to 2018, the area of gentle sloping farmland, steep sloping farmland, and precipitous sloping farmland all decreased, and the sharpness of the decrease was precipitous sloping farmland>steep sloping farmland>gentle sloping farmland;(2)from 1990 to 2018, the most critical land use types of sloping farmland transferred in and out of Yan'an City were grassland and woodland, among which the type of sloping farmland with the largest transfer area was steep sloping farmland;(3)from 1990 to 2018, the gentle sloping farmland in Yan'an City mainly concentrated along the Beiluo River in the south, and steep sloping farmland and precipitous sloping farmland concentrated in the hilly and gully areas in the north; the areas with reduced sloping farmland distributed along the Yan River, along the Qingjian River-Yongping River, and along the Beiluo River in the northwest; the sloping farmland along the Hulu River in the west increased slightly, and the main types of increase were steep sloping farmland and precipitous slope farmland;(4)from 1990 to 2018, the soil water erosion situation in Yan'an City was significantly improved; the soil erosion modulus decreased in most areas; the main increase areas were located in the rocky mountainous area between the Hulu River and Beiluo River in the west, the rocky mountainous area in the southwest, the junction area of Yan River and Xichuan River;(5)from 1990 to 2018, the soil erosion modulus of the dynamic change areas of different types of sloping farmland in Yan'an City decreased overall, and the severity of soil erosion changes was precipitous sloping farmland>steep sloping farmland>gentle sloping farmland; different types of sloping farmland had a strong reduction in soil erosion in the areas with dynamic changes. All areas had a left-open ‘C' shape in space, and their spatial distribution pattern was affected by changes of vegetation coverage, changes of rainfall erosivity, and changes of water and soil conservation measures. The magnitude of influence was change of vegetation cover>change of rainfall erosivity>change of water and soil conservation measures.
- References:
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Last Update:
2022-04-20