根系分泌物典型组分对生物炭胶体稳定性和迁移能力的影响*
DOI:
作者:
作者单位:

中国农业大学土地科学与技术学院

作者简介:

通讯作者:

中图分类号:

S153.3

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Effects of Typical Components of Root Exudates on the Stability and Transport of Biochar Colloids
Author:
Affiliation:

College of Land Science and Technology,China Agricultural University

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
    摘要:

    根系分泌物是可溶性有机质的主要来源,能够在一定程度上影响胶体在多孔介质中的稳定性和迁移行为。随着生物炭的广泛应用,探究土壤中的根系分泌物对生物炭胶体在地下环境中稳定性和迁移能力的影响非常重要。本研究通过室内聚集和迁移实验探究了根系分泌物的典型组分半乳糖(Gal)、赖氨酸(Lys)以及乙酸(AcOH)对小麦生物炭(WB)和松树木屑生物炭(PB)胶体的稳定性和迁移特性的影响。实验结果表明:典型根系分泌物组分浓度高低对生物炭颗粒ζ电势具有一定的影响。半乳糖和赖氨酸浓度较低时,其对生物炭胶体聚集和迁移影响较小,难以对生物炭的环境行为造成显著影响;但是乙酸可以明显降低生物炭胶体在NaCl溶液中的稳定性,抑制生物炭胶体在多孔介质中的迁移能力。这可能是因为乙酸中有机酸阴离子容易与生物炭表面含氧官能团形成氢键,增加了生物炭对乙酸的吸附,降低了生物炭胶体的稳定性。

    Abstract:

    【Objective】Root exudates are the main sources of dissolved organic matter, which can affect the stability and transport behaviors of colloids in porous media to some extent. With the wide application of biochar in soils, it is very important to understand the effects of root exudates on the stability and mobility of biochar colloids in the subsurface environment. 【Method】Galactose (Gal), lysine (Lys) and acetic acid (AcOH) are the typical components of root exudates. This study investigated the effects of Gal, Lys and AcOH on the stability and transport behaviors of wheat biochar (WB) and pine sawdust biochar (PB) colloids by aggregation and transport experiments. 【Result】The results showed that the concentration of root exudates had a certain influence on the ζ potential of biochar particles. At low Gal and Lys concentrations, their effects on the aggregation and transport of biochar colloids were small, thus, there were no significant effects on the environmental behavior of biochar colloids. In contrast, AcOH reduced the stability of biochar colloids in NaCl solution and inhibited the transport of biochar colloids in porous media. This may be related to the fact that the organic acid anions in acetic acid were easy to form hydrogen bonds with the oxygen-containing functional groups on the surface of biochar. Thus, the adsorption of AcOH by biochar was increased and the stability of biochar colloids was decreased. 【Conclusion】The concentration of root exudates such as Gal and Lys plays an important role in their ability to influence the aggregation and transport of biochar colloids. However, the adsorption of AcOH, even at low concentrations, significantly affects the aggregation and transport of biochar colloids.

    参考文献
    相似文献
    引证文献
引用本文

潘岳,张雨,王洋,商建英.根系分泌物典型组分对生物炭胶体稳定性和迁移能力的影响*[J].土壤学报,,[待发表]
PAN Yue, ZHANG Yu, WANG Yang, SHANG Jianying. Effects of Typical Components of Root Exudates on the Stability and Transport of Biochar Colloids[J]. Acta Pedologica Sinica,,[In Press]

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数: