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| Land use/cover changes in Liudaogou catchment in water-wind erosion crisscross region in Loess Plateau during the past 20 years |
| Ma Tongyu1, Zhang Xiaoping2, Ma Qin1, Lei Yongnan2 |
| 1. College of Resources and Environment, Northwest A&F University; 2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources：712100, Yangling, Shaanxi, China |
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Abstract To study the evolution characteristics of erosion environment in water-wind erosion crisscross region in Loess Plateau during the past 20 years, we investigated and analyzed the land use/cover change in Liudaogou catchment on farmland, woodland, grassland and industrial land with the land use information in 1990, 1995, 2002 and the RS image in 2010. The results showed: 1）From 1990 to 2010, due to the dramatically transference from slope farmland and dry terrace to woodland and grassland, especially after the implementation of the “Grain for green” policy in 1999, the percentage of the woodland and grassland increased from 35.74% to 62.79% and the percentage of farmland decreased from 33.87%（233.54hm2）to 7.61%（52.49hm2）. The main farming area distributed mainly in the land below the gully edge, whose proportion went up from 13.82% to 74.04% out of the total area of farmland. Industrial area was extended from 0.28hm2 to 14.89hm2 and the coal mining becomes more active. 2）In the respect of underlying surface influencing erosion process, the vegetation coverage, especially above the gully edge, improved obviously. However, the increasingly more active coal mining, on the one hand, disrupted the growth of vegetation and land use type in this region, on the other hand, accelerated the erosion environment degeneration.
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Received: 07 November 2011
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