raybet体育在线 院报 ›› 2025, Vol. 42 ›› Issue (5): 97-103.DOI: 10.11988/ckyyb.20240096

• 水土保持与生态修复 • 上一篇    下一篇

生物炭对红黏土饱和持水量及植物生长的影响

李源涛1(), 刘之葵1(), 陶国钲1, 韦海霞1, 蒋仕清2, 姜大伟2   

  1. 1 桂林理工大学 土木工程学院,广西 桂林 541004
    2 建材桂林地质工程勘察院有限公司,广西 桂林 541002
  • 收稿日期:2024-01-25 修回日期:2024-04-23 出版日期:2025-05-01 发布日期:2025-05-01
  • 通信作者:
    刘之葵(1968-),男,江西兴国人,教授,博士,博士生导师,主要从事地质工程、岩土工程专业的教学与科研工作。E-mail:
  • 作者简介:

    李源涛(1999-),男,广西南宁人,硕士研究生,研究方向为环境岩土工程。E-mail:

  • 基金资助:
    国家自然科学基金项目(41867039); 广西岩土力学与工程重点试验室项目(桂科能20-Y-XT-03); 南方石山地区矿山地质环境修复工程技术创新中心项目(CXZX2020002)

Effects of Biochar on Saturated Water Holding Capacity of Red Clay and Plant Growth

LI Yuan-tao1(), LIU Zhi-kui1(), TAO Guo-zheng1, WEI Hai-xia1, JIANG Shi-qing2, JIANG Da-wei2   

  1. 1 School of Civil Engineering, Guilin University of Technology, Guilin 541004, China
    2 Guilin Geological Engineering Investigation Institute of China Building Materials Group Limited Company, Guilin 541002, China
  • Received:2024-01-25 Revised:2024-04-23 Published:2025-05-01 Online:2025-05-01

摘要:

生物炭具有疏松多孔、高比表面积的性质,是一种环境友好型的土壤改良剂。为研究生物炭对红黏土的持水能力及常用护坡草种生长的影响,以桂林红黏土为研究对象,将不同原料类型和掺量的生物炭掺入红黏土中,进行了持水量试验、盆栽种植试验、酸碱度试验,结合扫描电镜(SEM)阐释生物炭对红黏土持水能力的影响机制。试验结果表明:红黏土的饱和持水量和pH值均随4种生物炭掺量的增加而增大,生物炭的掺入有效地改善了植物生长环境条件;掺入生物炭后草种的发芽数和株高都得到提高,但掺量>5%后会抑制草种生长;通过微观测试发现,生物炭充填于红黏土团聚体之间的孔隙中,因其多孔性和亲水性,使红黏土的饱和持水量提高。研究成果有助于生物炭在红黏土地区生态护坡工程中的应用。

关键词: 生物炭, 红黏土, 持水能力, 植物生长, 微观结构

Abstract:

Biochar is an environmentally friendly soil modifier due to its porous and high specific surface area. To investigate its impact on the water-holding capacity of red clay and the growth of common slope grass species, we selected red clay from Guilin as the research subject. Different types and dosages of biochar were incorporated into the red clay. Subsequently, water-holding capacity tests, pot-planting tests, and pH tests were conducted. Scanning electron microscopy (SEM) was employed to elucidate the mechanism by which biochar affects the water-holding capacity of red clay. Results revealed that the saturated water-holding capacity and pH value of red clay increased with the rising content of four types of biochar, effectively improving the environmental conditions for plant growth. Specifically, adding biochar increased the germination number and plant height of grass seeds. However, a biochar content exceeding 5% negatively affected the growth of grass seeds. Microscopic tests indicated that biochar filled the pores between red clay aggregates, thereby enhancing the saturated water-holding capacity of red clay thanks to its porosity and hydrophilicity.

Key words: biochar, red clay, water-holding capacity, plant growth, microstructure

中图分类号: 

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