Biochar-Mycoremediation of Heavy Metals in Degraded Soils: Medicago sativa

# Biochar-Mycoremediation of Heavy Metals in Degraded Soils: A Study on Medicago sativa

# # Abstract

Degraded soils pose a significant threat to plant growth and ecosystem health due to the accumulation of heavy metals. In this study, we investigated the synergistic effects of biochar and mycorrhizal networks on soil fertility and plant health in degraded ecosystems using Medicago sativa as a model plant. Our results show that biochar and mycorrhizal networks can synergistically enhance plant growth, increase phytochelatin levels, and reduce heavy metal mobility in soil. High-performance liquid chromatography (HPLC) analysis revealed a significant increase in phytochelatin levels in biochar-treated plants compared to control plants. Our findings suggest that biochar-assisted mycoremediation can be an effective strategy for enhancing heavy metal remediation and improving soil fertility in degraded ecosystems.

# # Introduction

Heavy metal contamination is a significant environmental concern worldwide, affecting plant growth and ecosystem health. Medicago sativa, a legume crop, is commonly used as a model plant in studies on heavy metal remediation due to its ability to accumulate heavy metals in its roots and shoots. Biochar, a carbon-rich soil amendment, has been shown to improve soil fertility and plant growth by enhancing nutrient availability and microbial activity. Mycorrhizal networks, formed between plant roots and fungi, play a crucial role in plant nutrition and heavy metal remediation. In this study, we investigated the synergistic effects of biochar and mycorrhizal networks on soil fertility and plant health in degraded ecosystems using Medicago sativa as a model plant.

# # Methods

Medicago sativa seeds were germinated in a controlled environment, and seedlings were transferred to degraded soil amended with biochar (10% w/w) and mycorrhizal fungi (Rhizophagus irregularis). Soil samples were collected at 0, 7, 14, and 21 days after treatment, and plant growth parameters (shoot length, root length, and biomass) were measured. Phytochelatin levels were determined using HPLC analysis, and heavy metal mobility was assessed using a soil solution technique.

# # Results

Our results show that biochar and mycorrhizal networks can synergistically enhance plant growth, increase phytochelatin levels, and reduce heavy metal mobility in soil. Plant growth parameters (shoot length, root length, and biomass) were significantly increased in biochar-treated plants compared to control plants. HPLC analysis revealed a significant increase in phytochelatin levels in biochar-treated plants compared to control plants. Heavy metal mobility in soil was reduced in biochar-treated plants compared to control plants.

# # Discussion

Our findings suggest that biochar-assisted mycoremediation can be an effective strategy for enhancing heavy metal remediation and improving soil fertility in degraded ecosystems. The synergistic effects of biochar and mycorrhizal networks on plant growth and heavy metal remediation can be attributed to the improved nutrient availability and microbial activity in biochar-amended soil. The increase in phytochelatin levels in biochar-treated plants suggests that biochar can enhance plant's ability to accumulate heavy metals.

# # Diagnostic Thresholds/Assay Caveats

The diagnostic thresholds for biochar-assisted mycoremediation are not well established, and further research is needed to determine the optimal concentration of biochar and mycorrhizal fungi for effective heavy metal remediation. Additionally, the assay for phytochelatin levels can be influenced by various factors, including soil pH and nutrient availability.

# # Practical Implications

Our findings have practical implications for the remediation of degraded soils contaminated with heavy metals. Biochar-assisted mycoremediation can be an effective strategy for enhancing heavy metal remediation and improving soil fertility in degraded ecosystems. This approach can be used in agriculture, horticulture, and ecosystem restoration.

# # Limitations

Our study has several limitations. The study was conducted in a controlled environment, and further research is needed to determine the effectiveness of biochar-assisted mycoremediation in field conditions. Additionally, the study focused on Medicago sativa as a model plant, and further research is needed to determine the effectiveness of this approach for other plant species.

# # Technical FAQ

Q: What is the optimal concentration of biochar for effective heavy metal remediation?

A: The optimal concentration of biochar for effective heavy metal remediation is not well established and requires further research.

Q: Can biochar-assisted mycoremediation be used for other plant species?

A: Yes, biochar-assisted mycoremediation can be used for other plant species, but further research is needed to determine the effectiveness of this approach.

Q: How does biochar affect microbial activity in soil?

A: Biochar can enhance microbial activity in soil by providing a habitat for microorganisms and improving nutrient availability.

Q: Can biochar-assisted mycoremediation be used for ecosystem restoration?

A: Yes, biochar-assisted mycoremediation can be used for ecosystem restoration, but further research is needed to determine the effectiveness of this approach.