| 引用本文: | 陈希霖,蔡秦杨,高红贝,等.施加生物质炭对滨海盐碱土壤水分运移的影响[J].灌溉排水学报,0,():-. |
| chenxilin,caiqinyang,gaohongbei,et al.施加生物质炭对滨海盐碱土壤水分运移的影响[J].灌溉排水学报,0,():-. |
|
| 摘要: |
| 【目的】明确施加生物质炭对盐碱土壤水力特性的影响和作用机制。【方法】通过土柱模拟入渗实验，分析了生物质炭不同添加量（质量分数分别为0%、0.3%、0.5%、0.8%、1.0%、3.0%、5.0%、8.0%）对典型滨海盐碱土壤导水性和持水性能的影响。【结果】试验结果表明（1）供试土壤水分入渗速率和饱和导水率随添加量的提高呈现先增大后减小的趋势：生物质炭添加量<1.0%有助于供试土壤水分入渗，>1.0%则制约供试土壤导水性，1.0%的添加量是影响土壤导水率的重要转折点；（2）对水分特征曲线的实验结果表明施加生物质炭能够显著提升滨海盐碱土壤的持水能力，且随炭含量的增加而增加，但过量添加生物质炭降低了土壤渗透性，不利于提高滨海土壤的导水性。【结论】综上，利用生物质炭作为调理剂对滨海盐碱地实施改良时，确定合理的生物质炭添加量将使影响改良成效的关键。 |
| 关键词: 生物质炭；滨海盐碱地；土壤水分入渗；饱和导水率；土壤水分特征曲线 |
| DOI： |
| 分类号:S156.4+2 |
| 基金项目:浙江省重点研发计划项目(2020C01017)；浙江省基础公益研究计划项目(GN21D010004) |
|
| Effects of Biochar on Water Movement in Coastal Saline-alkali Soil |
|
chenxilin, caiqinyang, gaohongbei, shanshengdao
|
|
Zhejiang university of science and technology
|
| Abstract: |
| 【Objective】 The effects of biochar on the soil hydraulic properties are the prerequisite and basis for its application to improve coastal saline soils. 【Method】 Through soil water infiltration experiment, the effects of different biochar additions (0%, 0.3%, 0.5%, 0.8%, 1.0%, 3.0%, 5.0%, 8.0% by mass) on the water conductivity and water holding properties of typical coastal saline-alkali soil were conducted. 【Results】The experimental results expressed that (1) the water infiltration rate and saturated hydraulic conductivity of the test soil showed increased first and then decreased with the biochar increase. The biochar addition amount <1.0% was beneficial to the soil water infiltration, >1.0% was restricted to the soil water conductivity. The 1.0% addition was an important turning point affecting the soil water conductivity; (2) the moisture characteristic curves showed that the application of biochar could significantly improve the water holding capacity of coastal saline soil with the increase of char content. However, the excessive addition of biomass char reduced the soil permeability and the hydraulic conductivity of coastal soil. 【Conclusion】When using biochar as conditioner to improve coastal saline-alkali land, determining the reasonable amount of biochar addition will affect the improvement results. |
| Key words: Biochar; coastal saline-alkali land; soil water infiltration; saturated hydraulic conductivity; soil water characteristic curve |
