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影响
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李争争(1995-),女,在读硕士研究生,主要从事盐碱地水盐运移研究。E-mail:lizhengzheng0411@163.com

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S278

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内蒙古自治区科技成果转化项目(CGZH2018138);内蒙古科技厅科技计划项目(2019)1356


Effect of Flocculating Yellow River Sediment with Biochar on Water-Salt Transport and Hydraulic Characteristic Parameters of Saline Soil
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    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, 1%, 2%, 3%, 6%,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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李争争, 屈忠义, 王丽萍, 高晓瑜, 何婧.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影响[J].水土保持学报,2020,34(3):326~331

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  • 收稿日期:2019-11-25
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  • 在线发布日期: 2020-05-15
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