期刊
SOLID EARTH
卷 7, 期 6, 页码 1577-1590出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/se-7-1577-2016
关键词
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资金
- National Natural Science Foundation of China [51309194, 51679206]
- Fundamental Research Funds for the Central Universities [2452016120, QN2013047]
- Special Research Foundation for Young teachers [2452015473]
- open foundation of State Key Laboratory, Institute of Water and Soil Conservation
- Chinese Academy of Sciences and Ministry of Water Resources [K31800990-21417]
- Doctoral Fund of Ministry of Education of China [20130204120034]
- Initial Scientific Research Funds for PhD from Northwest AF University [2012BSJJ004]
Soil erosion not only results in the destruction of land resources and the decline of soil fertility, but also contributes to river channel sedimentation. In order to explore the spatiotemporal evolution of erosion and sediment yield before and after returning farmland in a typical watershed of the hilly and gully region (Chinese Loess Plateau), a distributed-dynamic model of sediment yield based on the Chinese Soil Loss Equation (CSLE) was established and modified to assess the effects of hydrological factors and human activities on erosion and sediment yield between 1995 and 2013. Results indicate that (1) the modified model has the characteristics of a simple algorithm, high accuracy, wide practicability and easy expansion, and can be applied to predict erosion and sediment yield in the study area, (2) soil erosion gradations are closely related to the spatial distribution of rainfall erosivity and land use patterns, and the current soil and water conservation measures are not efficient for high rainfall intensities, and (3) the average sediment yield rate before and after model modification in the most recent 5 years (in addition to 2013) is 4574.62 and 1696.1 Mg km(-2), respectively, decreasing by about 35.4 and 78.2% when compared to the early governance (1995-1998). However, in July 2013 the once-in-a-century storm is the most important reason for maximum sediment yield. Results may provide an effective and scientific basis for soil and water conservation planning and ecological construction of the hilly and gully region, Chinese Loess Plateau.
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