[1]ZHOU Xiaoqing,MA Qianhong,ZHANG Keli.Study on the Characteristics of Soil and Water Loss in Shaanxi Province Based on Transects[J].Research of Soil and Water Conservation,2018,25(04):47-53.
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Study on the Characteristics of Soil and Water Loss in Shaanxi Province Based on Transects
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 04
Page number:
47-53
Column:
Public date:
2018-06-13
- Title:
- Study on the Characteristics of Soil and Water Loss in Shaanxi Province Based on Transects
- Keywords:
- soil and water loss; slope gradient; slope length; land utilization type; transect; Shaanxi Province
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- Shaanxi Province is one of the most serious soil erosion regions in China. According to the special investigation of soil and water conservation of the First National Water Census, we selected nine typical transects (seven transverse transects and two longitudinal transects) which contained 314 survey units and calculated soil erosion moduli using CSLE for each block in Shaanxi Province. Based on the data, the regional effects of slope gradient, slope length and land utilization types on soil erosion were compared and analyzed. The results showed that: (1) slope gradients of transverse transects decreased from the Loess Plateau to the Guanzhong Plain, and increased from the Guanzhong Plain to the Qinbashan mountainous region; the soil erosion moduli of blocks with a slope gradient > 20° or < 30° on the Loess Plateau were greater than other regions; on the whole, the critical slope gradient for soil erosion in Shaanxi Province was between 15°~30°; (2) soil erosion moduli increased in fluctuation with the increase of slope length; compared with other regions, soil erosion on the Loess Plateau was more serious in the slopes with length range of 10~20 m and > 30 m; (3) soil erosion moduli of farmland and orchard were higher than those of woodland and grassland, the soil erosion moduli of farmland and orchard increased at the beginning, then decreased, and increased again later with transects change from north to south; (4) comparing the regional differences, from north to south, the soil erosion moduli of transverse transects decreased firstly and then increased. Soil erosion of the Loess Plateau region was the most serious, followed by Qinbashan mountainous region, and soil erosion of Guanzhong Plain was slight. The soil erosion moduli of longitudinal transects were about 1 000 t/(km2·a). This study has great significance in recognizing regional differences of soil erosion factors, definiting the spatial variation laws of soil and water loss, and developing soil and water conservation planning according to local conditions in Shaanxi Province.
- References:
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