[1]JIA Junchao,ZHANG Xingchang.Preliminary Study on Water Retention of Layered Soil by Laboratory Simulation[J].Research of Soil and Water Conservation,2020,27(06):90-93,99.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 06
Page number:
90-93,99
Column:
目次
Public date:
2020-10-20
- Title:
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Preliminary Study on Water Retention of Layered Soil by Laboratory Simulation
- Author(s):
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JIA Junchao1,2, ZHANG Xingchang1
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(1.Biological Agriculture Institute of Shaanxi, Xi'an 710043, China; 2.Enzyme Engineering Research Center of Shaanxi, Xi'an 710043, China)
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- Keywords:
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layered soil; soil water retention curve; water retention capacity; fine embedded into coarse
- CLC:
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S152.7
- DOI:
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- Abstract:
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To reveal the water holding performance of the layer and homogeneous soil at different water potentials, five homogeneous soils and four layered soils(fine embedded into coarse, coarse covered with fine, fine covered with coarse and coarse embedded into fine)were set up to study their soil water retention curves by high-speed centrifuge method. The results show that the water retention capacity of the layered soil is higher than that of the homogeneous soil under the same soil material ratio; the water retention capacity in the treatment of coarse sandwiched fine is the highest, and the water content increases by 0.025 cm3/cm3 on average; under the same external suction, the effect of the amount of fine soil on soil water holding capacity is greater than that of soil structure; the soil water retention curve of layered soil can be simulated by the commonly models; the fitting accuracy of van Genuchten model is higher than the Brooks-Corey and Log normal distribution models based on the coefficient of determination(R2)and root mean square error(RMSE); the simulated parameters of soil water retention curve by the van Genuchten model indicate that the saturated water content and residual water content of the homogeneous soil are lower than those of layered soil, and the shape parameter α of homogeneous soils is higher than that of layered soil under the same soil material ratio. The results show that the water holding capacity of layered soil is higher than that of homogeneous soil under the same material ratio, and the water holding capacity of fine embedded into coarse is stronger. In addition, the effect of soil content with fine texture on soil water retention is greater than that of soil structure.