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| Anti-scourability of surface soil of different land use types in area of Yuanyang terrace |
| LI Yang-Fang1, SONG Wei-Feng1, BANG Yong-Gang2, LI Jian3 |
| (1.Department of Environmental Science and Engineering, Southwest Forestry University, 650224,Kunming; 2.Water Conservancy Bureau of Honghe Prefecture,Yunnan Province, 661000,Mengzi,Yunnan; 3.Soil and Water Conservation Office of Yuanyang County,Yunnan Province, 662400,Yuanyang Yunnan: China) |
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Abstract On the basis of undisturbed soil erosion groove method and the field scouring test method with the physical properties of woodland, shrub land, waste grassland and slope farm land, the anti-scourability of surface soil of those four land use types and the main influencing factors were studied in core area of Yuanyang County with the purpose of studying the soil erosion characteristics and the mechanism of water conservation. The results showed that the anti-scourability of surface soil of waste grassland was the best, and then followed by shrub land, forest land and slope farm land. With the increase of slope and the water flow the sediment amount increased as well, slope farm land had weak anti-scourability. The fibrous roots could enhance the soil anti-scourability, especially the roots with diameter less than 1.0 mm had strong consolidation. If there were more water-stable aggregate, the anti-scourability was stronger. If the diameter of soil particle in surface soil of waste grassland and shrub land was larger than 3.0 mm, the water-stable aggregates content was 93.33%.
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Received: 16 November 2011
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