• Journal of Geographical Sciences
  • Vol. 30, Issue 3, 401 (2020)
Wenchao LIU1、2, Jiyuan LIU1, and Wenhui KUANG1、*
Author Affiliations
  • 1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • 2. School of Geographic and Environmental Sciences, Tianjin Normal University, Tianjin 300387, China
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    DOI: 10.1007/s11442-020-1734-7 Cite this Article
    Wenchao LIU, Jiyuan LIU, Wenhui KUANG. Spatio-temporal characteristics of soil protection efforts of the Grain for Green Project in northern Shaanxi Province[J]. Journal of Geographical Sciences, 2020, 30(3): 401 Copy Citation Text show less
    Figure 1
    Fig. 1. Figure 1
    Figure 2
    Fig. 2. Figure 2
    Figure 3
    Fig. 3. Figure 3
    Figure 4
    Fig. 4. Figure 4
    Figure 5
    Fig. 5. Figure 5
    Figure 6
    Fig. 6. Figure 6
    Figure 7
    Fig. 7. Figure 7
    Figure 8
    Fig. 8. Figure 8
    Figure 9
    Fig. 9. Figure 9
    Figure 10
    Fig. 10. Figure 10
    Figure 11
    Fig. 11. Figure 11
    PrimarySecondaryIntensity
    1 Water erosion11 Surface erosion111Trace 112 Slight 113 Moderate
    114 High 115 Severe 116 Extreme
    12 Gullying121Trace 122 Slight 123 Moderate
    124 High 125 Severe 126 Extreme
    2 Wind erosion20 No sub-classes201Trace 202 Slight 203 Moderate
    204 High 205 Severe 206 Extreme
    3 Freeze-thaw erosion30 No sub-classes301Trace 302 Slight 303 Moderate
    304 High
    4 Gravitational erosion40 No sub-classesNo intensity grading
    5 Man-made erosion50 No sub-classesNo intensity grading
    Table 1.

    National soil erosion classification system

    LevelAverage erosion modulus (t/ha·a)
    1 Trace erosion< 10
    2 Slight erosion10-25
    3 Moderate erosion25-50
    4 High erosion50-80
    5 Severe erosion80-150
    6 Extreme erosion≥ 150
    Table 2.

    Soil erosion classification standards

    Erosion levelTheoretical value (t/ha)Verification pointsNo. of points with simulated values within the theoretical value rangeCorrect judgement rate (%)2005 model simulated average (t/ha)
    Trace<10503876.007.89
    Slight10-25463371.7417.90
    Moderate25-50563969.6437.29
    High50-80462860.8761.61
    Severe80-150503774.0089.43
    Extreme≥ 150733852.05123.42
    Table 3.

    RUSLE model simulation results

    Station nameCatchment area (104 ha)Sediment runoff (108 t)Sediment runoff modulus (t/ha)
    Wenjiachuan86.450.1112.72
    Baijiachaun296.620.9632.36
    Ganguyi58.910.2237.35
    Huangfuchuan31.990.1443.76
    Zhuangtou251.540.7027.83
    Longmen4975.522.364.75
    Table 4.

    Hydrological station data

    200020102013
    Soil erosion(104 t)Proportion*(%)Soil erosion(104 t)Proportion*(%)Soil erosion(104 t)Proportion*(%)
    Yan’an11856.3843.136484.5640.595503.1535.46
    Yulin15631.6956.879493.1459.4110016.6164.54
    Table 5.

    Statistical analysis of soil erosion in Yan’an and Yulin in 2000, 2010 and 2013

    Type of changeRegionYan’anYulin
    Soil erosion(104 t)Proportion*(%)Soil erosion(104 t)Proportion* (%)Soil erosion(104 t)Proportion*(%)
    Farmland→Forest-217.11-43.91-129.05-43.18-88.06-45.02
    Farmland→Grassland-654.29-48.51-391.28-47.93-263.01-49.39
    Farmland→Water body-0.26-24.49-0.10-33.99-0.16-20.94
    Farmland→Construction-13.84-38.31-7.57-43.10-6.28-33.79
    Farmland→Unutilized-0.40-28.14-0.19-25.72-0.21-30.75
    Total reductions-885.90-47.08-528.18-46.59-357.71-47.82
    Table 6.

    Soil erosion moduli change of repurposed farmland in northern Shaanxi between 2000 and 2010

    Type of changeRegionYan’anYulin
    Soil erosion(t)Proportion*(%)Soil erosion(t)Proportion*(%)Soil erosion(t)Proportion*(%)
    Farmland→Forest0.000.000.000.000.000.00
    Farmland→Grassland-45.50-51.980.000.00-45.50-51.98
    Farmland→Water body-295.72-7.24-44.67-4.67-251.05-8.02
    Farmland→Construction-2162.13-15.32130.873.05-2293.00-23.35
    Farmland→Unutilized1880.3710.26-193.36-43.392073.7311.59
    Total reductions-622.97-1.70-107.17-1.88-515.81-1.67
    Table 7.

    Changes in soil erosion resulting from repurposing farmland in northern Shaanxi between 2010 and 2013

    2000 mean soil erosion modulus (t/ha)2010 mean soil erosion modulus (t/ha)2000-2010 change in soil erosion modulus (%)
    Repurposed farmland48.2225.52-47.08
    Non-repurposed farmland38.4127.43-28.60
    Whole of northern Shaanxi34.6620.15-41.87
    Table 8.

    Changes in the soil erosion moduli of different regions of northern Shaanxi between 2000 and 2010

    2000 mean soil erosion modulus (t/ha)2010 mean soil erosion modulus (t/ha)2000-2010 change in soil erosion modulus (%)
    Repurposed terraced farmland15.2114.58-4.17
    Repurposed sloping farmland50.6626.30-48.09
    Non-repurposed terraced farmland16.7415.84-5.38
    Non-repurposed sloping farmland41.5729.12-29.95
    Table 9.

    Changing soil erosion moduli of terraced and sloping farmland in northern Shaanxi between 2000 and 2010

    Wenchao LIU, Jiyuan LIU, Wenhui KUANG. Spatio-temporal characteristics of soil protection efforts of the Grain for Green Project in northern Shaanxi Province[J]. Journal of Geographical Sciences, 2020, 30(3): 401
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