Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (5): 779-790.doi: 10.1007/s11442-019-1627-9
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Xuefeng YUAN1,2,3,4(), Jichang HAN1,2,*(
), Yajing SHAO4, Yuheng LI3, Yongsheng WANG3
Received:
2018-07-15
Accepted:
2019-01-10
Online:
2019-05-25
Published:
2019-04-19
Contact:
Jichang HAN
E-mail:zyxfyun@chd.edu.cn;hanjicsxdj@126.com
About author:
Author: Yuan Xuefeng, Associate Professor, specialized in land science and rural development. E-mail:
Supported by:
Xuefeng YUAN, Jichang HAN, Yajing SHAO, Yuheng LI, Yongsheng WANG. Geodetection analysis of the driving forces and mechanisms of erosion in the hilly-gully region of northern Shaanxi Province[J].Journal of Geographical Sciences, 2019, 29(5): 779-790.
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Table 1
Quantitative analysis of various soil erosion grades in the loess hilly-gully region of northern Shaanxi Province"
Grade number | Erosion level | Average erosion modulus (t/km2×a) | Area (km2) | Proportion (%) |
---|---|---|---|---|
1 | Slight | <1000 | 2618 | 8.07 |
2 | Minor | 1000-2500 | 3160 | 9.74 |
3 | Moderate | 2500-5000 | 8659 | 26.69 |
4 | Intense | 5000-8000 | 6080 | 18.74 |
5 | Very intense | 8000-15000 | 6333 | 19.52 |
6 | Extreme | >15000 | 5587 | 17.22 |
Table 2
Determinants of soil erosion in the loess hilly-gully region of northern Shaanxi Province"
Influencing factor | Population | Precipitation | Land-use type | Elevation | Soil type | Sand content |
---|---|---|---|---|---|---|
q value | 0.127102 | 0.102612 | 0.066366 | 0.027132 | 0.018847 | 0.015876 |
Influencing factor | Silt content | Clay content | GDP | Slope | Aspect | |
q value | 0.009635 | 0.004776 | 0.003131 | 0.001543 | 0.000789 |
Table 3
Factor interaction survey results matrix in the loess hilly-gully region of northern Shaanxi Province"
Precipitation | Land-use type | Population | Soil type | Elevation | |
---|---|---|---|---|---|
Precipitation | 0.1026 | - | - | - | - |
Land-use type | 0.1534 | 0.0664 | - | - | - |
Population | 0.2062 | 0.1805 | 0.1271 | - | - |
Soil type | 0.1207 | 0.0895 | 0.1441 | 0.0188 | - |
Elevation | 0.1318 | 0.0940 | 0.1882 | 0.0538 | 0.0271 |
Table 4
The effect of land coverage changes on the q value in the loess hilly-gully region of northern Shaanxi Province"
Year | q value | Cultivated land area (km2) | Forested area (km2) | Grassland area (km2) | Wetland area (km2) | Urban and industrial infrastructure area (km2) | Unused land (km2) | Ratio of forest and grassland (%) |
---|---|---|---|---|---|---|---|---|
1995 | 0.066 | 16100 | 4080 | 17204 | 233 | 124 | 59 | 55.22 |
2000 | 0.059 | 16669 | 4695 | 16834 | 202 | 80 | 64 | 55.86 |
2005 | 0.049 | 15790 | 5638 | 16754 | 201 | 97 | 64 | 58.09 |
2010 | 0.048 | 15712 | 5727 | 16745 | 198 | 98 | 64 | 58.30 |
2015 | 0.047 | 15759 | 5688 | 16649 | 203 | 135 | 110 | 57.95 |
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