[1]WEN Man,ZHENG Ji-yong.Effects of Different Sizes of Biochar and Their Additiont Rates on Soil Shrinkage Characteristics[J].Research of Soil and Water Conservation,2012,19(01):46-50,55.
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Effects of Different Sizes of Biochar and Their Additiont Rates on Soil Shrinkage Characteristics
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
19
Number of periods:
2012 01
Page number:
46-50,55
Column:
Public date:
2012-02-20
- Title:
- Effects of Different Sizes of Biochar and Their Additiont Rates on Soil Shrinkage Characteristics
- CLC:
- S152.7
- DOI:
- -
- Abstract:
- Soil shrinkage characteristics play a key role in the quantitative evaluation on soil structure and hydraulic properties. Because of the highly developed porous structure and huge specific surface area, biochar addition into soil can not only change the soil biochemical properties, but also affect the soil shrinkage characteristics. In this paper, the effects of application of 3 biochar sizes (2~1 mm, 1~0.25 mm, <0.25 mm) and 5 application rates(0, 10, 50, 100, 150 g/kg) on soil shrinkage characteristics were examined by using centrifugal method. The relationships between the soil specific volume with the pressure and the water content were fitted by using power function and the three straight lines model, respectively. The results showed the power function and the three straight lines model could well simulate the changes of the soil specific volume with the pressure and the water content. The biochar addition significantly changed the soil shrinkage properties, and the soil specific volume increased with the rise of the biochar addition rates under the same pressure condition. The soil shrinkage characteristics values decreased with the increasing proportion of biochar application at the false saturated stage and structure stage, but it increased at the super normal stage. The effects of different particle sizes of biochar on the soil shrinkage characteristics were not statistically significant. The results indicated that addition of the biochar into soil could reduce the soil shrinkage during the soil desiccation and improve the soil structure and water retention capability.
- References:
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1900-01-01