| This article has been：Browse 45Times Download 60Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2023105 |
|
| Effects of Biochar on Water Movement in Coastal Saline-alkali Soil |
|
CHEN Xilin, CAI Qinyang, GAO Hongbei, SHAN Shengdao
|
|
Key Laboratory of Waste Biomass Recycling and Ecological Treatment Technology of Zhejiang Province,
School of Environment and Resources, Zhejiang University of Science and Technology, Hangzhou 310023,China
|
| Abstract: |
| 【Objective】Investigating the influence mechanism of biochar application rate on the hydraulic characteristics of coastal saline-alkali soil. 【Method】By conducting indoor simulation infiltration experiments, the effects of different biochar application rates (mass fractions of 0%, 0.3%, 0.5%, 0.8%, 1.0%, 3.0%, 5.0%, 8.0%) on the water infiltration and water-holding capacity of typical coastal saline-alkali soil were studied. 【Result】The infiltration rate and saturated hydraulic conductivity of the tested soil increased first and then decreased with the increase of biochar addition. <1.0% biochar application rate facilitated soil water infiltration, while >1.0% biochar application rate constrained the hydraulic conductivity of the tested soil. The 1.0% biochar application rate represented a significant turning point affecting soil water infiltration and conductivity. Biochar application significantly enhanced the water-holding capacity of the coastal saline-alkali soil, and it increased with the biochar content. However, excessive biochar application rate reduced soil permeability, which was not conducive to improving the hydraulic conductivity of coastal soil.【Conclusion】As a conditioner, biochar will achieve better remediation results when added to coastal saline-alkali soils at an application rate of 0.8%-1.0%. |
| Key words: biochar; coastal saline-alkali land; soil water infiltration; saturated hydraulic conductivity; soil water characteristic curve |
|
|
