Journal of Geographical Sciences ›› 2016, Vol. 26 ›› Issue (4): 457-472.doi: 10.1007/s11442-016-1279-y
• Orginal Article • Previous Articles Next Articles
Haidong GAO1,2, Zhanbin Li1,2(), Lianlian JIA3, Peng Li1, Guoce XU1, Zongping REN1, Guowei PANG4, Binhua ZHAO1
Received:
2015-09-17
Accepted:
2015-10-20
Online:
2016-04-25
Published:
2016-04-25
About author:
Author: Gao Haidong (1983-), PhD, specialized in soil erosion and remote sensing. E-mail:
*Corresponding author: Li Zhanbin, Professor, E-mail:
Supported by:
Haidong GAO, Zhanbin Li, Lianlian JIA, Peng Li, Guoce XU, Zongping REN, Guowei PANG, Binhua ZHAO. Capacity of soil loss control in the Loess Plateau based on soil erosion control degree[J].Journal of Geographical Sciences, 2016, 26(4): 457-472.
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Figure 2
Various factor values from RUSLE for the Loess Plateau (a. rainfall erosivity factor (R); b. soil erodibility factor (K); c. slope length and steepness factor (LS); d. cover-management factor under actual conditions (C); e. cover-management factor under capacity of soil and water conservation measures (C); f. supporting-practice factor (P))"
Table 2
Actual soil erosion modulus and minimum possible soil erosion modulus in all zones"
Zoning | Actual soil erosion modulus (t·km-2·a-1) | Minimum possible soil erosion modulus (t·km-2·a-1) | Decreasing range (%) |
---|---|---|---|
River valley-plain area | 1377 | 978 | 28.98 |
Windy-sandy area | 465 | 311 | 33.12 |
Forested area | 3436 | 1863 | 45.78 |
Hilly-gully area | 4997 | 2477 | 50.43 |
Plateau-gully area | 5417 | 2611 | 51.80 |
Soil-rocky mountainous area | 3824 | 2650 | 30.70 |
Whole Loess Plateau | 3355 | 1921 | 42.74 |
Table 3
Ratios of different erosion types under actual conditions and under capacity of soil and water conservation measures"
Zoning | Under the actual condition (%) | Under capacity of soil and water conservation measures (%) | |||
---|---|---|---|---|---|
Slight erosion | Light or above | Slight erosion | Light or above | ||
River valley-plain area | 72.89 | 27.11 | 75.90 | 24.10 | |
Windy-sandy area | 87.27 | 12.73 | 90.38 | 9.62 | |
Forested area | 45.16 | 54.84 | 52.77 | 47.23 | |
Hilly-gully area | 31.66 | 68.34 | 43.57 | 56.43 | |
Plateau-gully area | 37.38 | 62.62 | 46.58 | 53.42 | |
Soil-rocky mountainous area | 40.81 | 59.19 | 46.94 | 53.06 | |
Loess Plateau | 50.48 | 49.52 | 57.71 | 42.29 |
Table 4
Land use structure under actual condition and under capacity of soil and water conservation measures in the Loess Plateau"
Land use type | Under the actual condition | Under capacity of soil and water conservation measures | |||
---|---|---|---|---|---|
Area (104 ha) | Percentage (%) | Area (104 ha) | Percentage (%) | ||
Paddy field | 58.75 | 0.91 | 58.74 | 0.91 | |
Irrigated land | 288.72 | 4.47 | 288.72 | 4.47 | |
Dam farmland | 28.63 | 0.44 | 28.63 | 0.44 | |
Terrace | 281.85 | 4.36 | 1229.31 | 19.03 | |
Slope farmland | 1443.91 | 22.35 | 0.00 | 0.00 | |
Forestland | 968.28 | 14.99 | 1248.72 | 19.33 | |
Grassland | 2697.69 | 41.75 | 3219.16 | 49.82 | |
Others | 693.63 | 10.73 | 388.18 | 6.01 |
Table 5
Sediment delivery rate in the major rivers at the middle reaches of the Yellow River"
River (hydrometric station) | Sediment load (104 t) | Deposition (104 t) | Erosion (104 t) | SDR |
---|---|---|---|---|
Tuwei river (Gaojiachuan) | 1713.51 | 271.09 | 1984.60 | 0.70 |
Dali river (Suide) | 2174.56 | 1119.47 | 3294.03 | 0.56 |
Jialu river (Shenjiawan) | 875.37 | 223.42 | 1098.79 | 0.64 |
Chabagou river (Caoping) | 71.75 | 131.40 | 203.15 | 0.33 |
Wuding river (Baijiachuan) | 4930.95 | 5555.41 | 10486.36 | 0.44 |
Gushanchuan river (Gaoshiya) | 1208.44 | 298.25 | 1506.70 | 0.59 |
Huangfuchuan river (Huangfu) | 3203.57 | 193.59 | 3397.16 | 0.87 |
Kuye (Wenjiachuan) | 6779.99 | 274.16 | 7054.15 | 0.82 |
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