[1]BAI Yiru,WANG Youqi,WANG Jianyu.Spatial Variability of Soil Hydraulic Properties and Influence Factors on Hillslope in Rainfed Region of the Loess Plateau[J].Research of Soil and Water Conservation,2015,22(04):168-172,177.
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Spatial Variability of Soil Hydraulic Properties and Influence Factors on Hillslope in Rainfed Region of the Loess Plateau
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
22
Number of periods:
2015 04
Page number:
168-172,177
Column:
Public date:
2015-08-28
- Title:
- Spatial Variability of Soil Hydraulic Properties and Influence Factors on Hillslope in Rainfed Region of the Loess Plateau
- Keywords:
- rainfed region of the Loess Plateau; hydraulic properties; spatial variability; water characteristic curve
- CLC:
- S152.7
- DOI:
- -
- Abstract:
- Soil hydraulic properties are very important in establishing water movement model and soil and water conservation. In this study, soil water characteristic curves of a slope were measured based on the grid sampling in rainfed region of the Loess Plateau. The parameters of Van Genuchten and Gardner model were fitted, and their spatial distribution characteristics were analyzed with classical statistics and geostatistics method. Then we examined the influencing factors on soil hydraulic properties. The results showed that the spatial variability of soil hydraulic properties on the slope surface was significant due to the complicated land use structure in the rainfed region of the Loess Plateau. Parameter n did not have spatial correlation and was thought as the simple random variable. The spatial variability of parameters(a, A, B, A·B) and Ks was influenced by systematic and random variations. The organic matter contents had effect on parameters A and B in Gardner model. Parameters A, B and effective porosity showed extremely significant correlations with saturated water content, field capacity and bulk density. The relationships between soil specific gravity and soil hydraulic properties were not significant. Soil water characteristic curves were influenced obviously by land uses and topography. At the high suction stage, the soil in the uphill can hold more moisture than downhill. The water holding capacity of farmland was less than grassland and forestland.
- References:
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1900-01-01