Critical slope gradient for compulsory abandonment of farmland on the hilly Loess Plateau |
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Authors: | Keli Tang Keli Zhang Aling Lei |
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Institution: | (1) Institute of Soil and Water Conservation, Chinese Academy of Sciences, 712100 Yangling, China;(2) Department of Hydraulic Engineering, Tsinghua University, 100084 Beijing, China;(3) Water Resources Conservation Bureau of Yangtze River, Ministry of Water Resources, 430051 Wuhan, China |
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Abstract: | Scientific evidence for the upper limit of farmland is proposed. Shallow gully erosion is one of erosion types distributed
extensively on sloping farmland in the hilly regions of the Loess Plateau. Field observation and aerial photos interpretation,
as well as laboratory experiments show that the shallow gully erosion occurring on the steeper farmland in the hilly regions
of the Loess Plateau is an important factor leading to intensive erosion on slope, because of its extensive distribution and
intensive runoff collection. The data on the formation, development and distribution of shallow gullies on sloping farmland
indicate that critical slope gradient for shallow gully initiation ranges from 15 to 20 degrees with an average of 18.2 degrees.
Therefore, it is suggested that critical slope gradient for compulsory abandonment of farmland on the hilly Loess Plateau
should be kept within the critical slope gradient for shallow gully initiation to prevent shallow gully formation in order
to control soil loss more effectively. But as the first step, the cultivation on the slopes with slope larger than 25 degrees
where the maximum erosion occurs should be strictly forbidden. |
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Keywords: | hilly region of Loess Plateau upper limitation for farmland shallow gully erosion erosion dynamic |
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