Effect of Flocculating Yellow River Sediment with Biochar on Water-Salt Transport and Hydraulic Characteristic Parameters of Saline Soil

LI Zhengzheng; QU Zhongyi; WANG Liping; GAO Xiaoyu; HE Jing

doi:10.13870/j.cnki.stbcxb.2020.03.047

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Effect of Flocculating Yellow River Sediment with Biochar on Water-Salt Transport and Hydraulic Characteristic Parameters of Saline Soil

更新时间：2025-03-12

- Effect of Flocculating Yellow River Sediment with Biochar on Water-Salt Transport and Hydraulic Characteristic Parameters of Saline Soil
- Vol. 34, Issue 3, Pages: 326-331(2020)
- 作者机构：
  
  1. 内蒙古农业大学水利与土木建筑工程学院,呼和浩特,010018
  2. 内蒙古农业大学寒旱区灌溉排水研究所,呼和浩特,010018
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.03.047
  CLC： S278
- Published：2020
- 稿件说明：
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LI Zhengzheng, QU Zhongyi, WANG Liping, et al. Effect of Flocculating Yellow River Sediment with Biochar on Water-Salt Transport and Hydraulic Characteristic Parameters of Saline Soil[J]. 2020, 34(3): 326-331.
DOI：

LI Zhengzheng, QU Zhongyi, WANG Liping, et al. Effect of Flocculating Yellow River Sediment with Biochar on Water-Salt Transport and Hydraulic Characteristic Parameters of Saline Soil[J]. 2020, 34(3): 326-331. DOI： 10.13870/j.cnki.stbcxb.2020.03.047.

摘要

通过室内环刀试验，研究絮凝黄河泥沙复配生物炭对盐碱土水盐运移及水力特征参数的影响。将生物炭和絮凝黄河泥沙按4∶6质量比混合成土壤改良剂，再将复配后的土壤改良剂按0，1%，2%，3%，6%，10%混合到盐碱土中。结果表明：（1）随着土壤改良剂添加量的增加，土壤孔隙度及水分含量不断增大，10%添加量下的土壤孔隙度和水分含量较未添加改良剂的处理平均增加了12%；（2）土壤饱和导水率在3%的添加量下最大，较未添加处理增大68.9%；（3）土壤改良剂添加量越大水分扩散的越慢，土壤pH越大，降低盐分的效果越不明显，试验发现3%添加量下土壤盐分降低的较为明显，17 cm以上盐分降低量达到30%~50%，但土壤pH增大不明显，仅增大4%左右，波尔兹曼参数λ增加31.5%，水分扩散速率较快。综合考虑，3%添加量处理可以较为有效地提高土壤孔隙度、土壤水分含量、饱和导水率、水分扩散率，并降低土壤表层盐分。

Abstract

The purpose of this study is to analyze the effect of biochar compounded with flocculated yellow river sediment on the water and salt transport and hydraulic characteristic parameters of saline soil through the laboratory tests with ring-knife. Firstly

biochar and flocculated Yellow River sediment were mixed into soil improver at the mass ratio of 4∶6

and then the soil improver was mixed into saline soil as the proportion of 0

and 10%. The results showed that: (1) Soil porosity and water content increased with the increase of soil improver.The soil porosity and water content under the 10% level are average increased 12% than the control treatment. (2) The saturated hydraulic conductivity of soil reaches the maximum at 3% addition

which is 68.9% higher than that control. (3) The additional amount of soil improver is inversely proportional to the rate of water diffusion

so that the soil pH value is higher

and then have the small effect of salt leaching.It was found that the decrease of soil salt was more obvious when the content of 3% was added. The amount of salt reduction above 17 cm reaches 30%~50%

but the increase in soil pH is only about 4%. The Boltzmann parameter λ increased by 31.5%

and the water diffusion rate was faster. All things considered

applying 3% soil improver can effectively increase soil porosity

soil water content

saturated hydraulic conductivity

water diffusivity

and reduce the soil salinity on the surface.

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