Spatio-temporal analysis of different levels of road expansion on soil erosion distribution: a case study of Fengqing county, Southwest China |
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| Authors: | Zhaoling Zhang Shiliang Liu Shikui Dong Wei Fu and Baoshan Cui |
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| Institution: | (1) Department of Agricultural Economics and Related Sciences in the Tropics and Subtropics, University of Hohenheim, Stuttgart, Germany |
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| Abstract: | The construction of roads has direct and indirect impacts on soil erosion, with spatio-temporal variations existing among
different levels of road zones. Aiming to quantitatively analyze the soil loss, this paper explored the relationship between
the erosion of soil and its distance from the road in Fengqing county, Southwest China in 1987 and 2004, respectively. The
average soil erosion was calculated and expressed with grid map using universal soil loss equation (USLE) model based on GIS
and RS. Along the different levels of roads classified as trunk, county, town, village and unpaved road, the buffer zones
were subdivided into five stripes, each of which was 200 meters wide. The average soil erosion modulus of each buffer zone
was also counted. Results show that the soil loss decreases with increasing distance to the road except rare trunk roads in
the region. In addition, the declined intensity varies with the different levels of roads. Soil erosion was more serious along
the lower level road than the higher ones. And soil erosion was more severe for all levels of roads in 1987 than those in
2004 because much more rainfalls affected the situation of soil erosion in 1987. |
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