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| Infiltration characteristics of soil and its influencing factors in abandoned farmland in the Hilly-gully region of Loess Plateau |
| Xu Jinghua1,Wang Guoliang1,2,Chen Yunming1,2,Lu Jianli1 |
| 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 Studying on infiltration characteristics of abandoned farmland in Loess Plateau will provide scientific basis for evaluating benefits of abandoned farmland during vegetation restoration and cognizing the influence by variations of underlying surface on soil hydrological processes.This paper studied the characteristics of soil infiltration by disc-permeameter and discussed its influencing factors in 4、6、8 years abandoned farmland.Taking the natural grassland as CK,the characteristics of soil infiltration were tested and its influencing factors were discussed in 4、6、8 years abandoned farmland in this paper.The results indicate: 1) the permeability of surface layer in natural grassland is better than that in short-term abandoned land,but in the lower layers(20 cm、40 cm)they are just contrary to that in surface layer;2) The initial infiltration rate in lower layer is 1.2 to 1.4 times faster than that in surface layer,and the final infiltration rate in lower layers is 1.9 to 2.8 times faster than that in surface layer,and the saturated hydraulic conductivity in lower layers is 1.9 to 3.0 times faster than that in surface layer;3) The permeability of surface layer drop with the increasing of years,but the opposite trend appear in lower layers;4) Soil crust is an important factor which effect permeability of surface layer.
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Received: 31 August 2007
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