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Feasibility study of PAHs contaminated soil remediation by Buchloe dactyloides (Nutt.) Engelm combined with biochar

  • Soils, Sec 2 • Global Change, Environmental Risk Assessment, Sustainable Land Use • Research Article
  • Published:
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Abstract

Purpose

Although the combined plant-biochar remediation in improving soil contaminated by polycyclic aromatic hydrocarbons (PAHs) is considered efficient (Singha and Pandey in Crit Rev Biotechnol 41:749–766, 2021), the potential for application remains poorly known. This study used clones of Buchloe dactyloides to evaluate the effects of biochar on the capability of phytoremediation and rhizosphere soil contaminated with PAH.

Materials and methods

Pot experiments were conducted to assess the effects of biochar on growth physiological parameters of B. dactyloides growth, accumulation of PAHs in B. dactyloides, and soil environment.

Results and discussion

The results showed that the application of biochar increased the levels of antioxidants (free proline, glutathione, and ascorbic acid), antioxidant enzymes (catalase and laccase), and phytohormones (abscisic acid, indole acetic acid, jasmonic acid, salicylic acid, and gibberellin), decreased the accumulation of reactive oxygen species and lipid peroxidation in the roots, thereby enhancing the antioxidant defense ability and improving PAHs tolerance in roots of B. dactyloides. Moreover, the activities of enzymes (catalase, dehydrogenases, urease and protease) and soil nutrients in the rhizosphere soil were significantly increased, the content of PAHs decreased, and the health of the rhizosphere soil was improved.

Conclusions

Biochar treatment promoted the accumulation of PAHs, improved soil environment and significantly enhanced the effects of phytoremediation. Therefore, the combined application of B. dactyloides and biochar can be considered as a feasible approach for the phytoremediation of PAH-contaminated soil.

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Data availability

The data used for the analyses presented in this work is available from the corresponding author on reasonable request.

Abbreviations

ABA:

Abscisic acid

AsA:

Ascorbic acid

APX:

Ascorbate peroxidase

B[a]p:

benzo[a]pyrene

CAT:

Catalase

DHA:

Dehydroascorbic acid

GA3 :

Gibberellin

GR:

Glutathione reductase

GSH:

Glutathione

GSSG:

Oxidized glutathione

GST:

Glutathione s-transferase

IAA:

Indole acetic acid

JA:

Jasmonic acid

KEGG:

Kyoto encyclopedia of genes and genomes

LPO:

Lipid peroxidation

MDA:

Malondialdehyde

PAHs:

Polycyclic aromatic hydrocarbons

Phe:

Phenanthrene

POD:

Peroxidase

Pyr:

Pyrene

ROS:

Reactive oxygen species

SA:

Salicylic acid

S-CAT:

Soil catalase

S-DHA:

Soil dehydrogenase

S-PRO:

Soil protease

S-U:

Soil urease

tZR:

Trans zeatin nucleoside

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Funding

This work was supported by the Fundamental Research Funds of Chinese Academy of Forestry [grant numbers CAFYBB2022XA002] and Open Competition Project to Select the Best Candidates of the National Forestry and Grassland Administration “Breeding of Excellent Grass Varieties” (202201).

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Authors and Affiliations

  1. State Key Laboratory of Efficient Production of Forest Resources, Key Laboratory of Tree Breeding and Cultivation of the National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, 100091, China

    Yuancheng Wang, Ao Li & Zhenyuan Sun

  2. College of Agriculture and Bioengineering (Peony Institute), Heze University, Heze, 274000, Shandong, China

    Xia Li

  3. College of Horticulture, Jilin Agricultural University, Changchun, Jilin, 130118, China

    Jiahui Yin

  4. Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing, China

    Xiaoxia Li, Yufeng Chen, Bokun Zou & Yongqiang Qian

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  1. Yuancheng Wang
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Wang, Y., Li, A., Li, X. et al. Feasibility study of PAHs contaminated soil remediation by Buchloe dactyloides (Nutt.) Engelm combined with biochar. J Soils Sediments (2024). https://doi.org/10.1007/s11368-024-03807-9

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