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| Study on phytoremediation effect of mildly zinc contaminated soil |
| Received:April 24, 2024 |
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| KeyWord:soil heavy metal pollution;zinc pollution;phytoremediation;enrichment and transport |
| Author Name | Affiliation | E-mail | | ZHANG Ruirui | Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China | | | GU Jiayan | Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China | | | HE Guofu | Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
Chongming Ecological Research Institute, Shanghai 200062, China
Shanghai Engineering Research Center of Organic Solid Waste BioTransformation, Shanghai 200241, China | gfhe@des.ecnu.edu.cn | | CHEN Xiaonan | Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China | | | GUO Linrui | Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China | | | XUE Wenjin | Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China | | | YANG Chunyi | Shanghai Key Laboratory of Urbanization Ecological Processes and Ecological Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China | |
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| Abstract: |
| This study aimed to evaluate the efficacy of various plant combinations in remediating zinc（Zn）-contaminated soil. In a mildly Zn-affected site in Shanghai, metasequoia, pentacanthus awn, ryegrass, and reed were cultivated, followed by a year-long experimental remediation using these plant assemblages. Throughout the study, we conducted continuous surveillance of key soil parameters, including pH, electrical conductivity（EC）, total and available Zn, organic matter, available phosphorus, potassium, nitrogen, and the Zn content in both the above- and underground parts of the plants, so as to evaluate the remediation effect of each plant combination, and screen out the plant combinations with the best repair effect. This paper serves as a reference for phytoremediation initiatives targeting similar Zn-contaminated soils. The findings of this research are as follows：the total Zn removal rates achieved were 8.89%~26.24%, demonstrating the selected combinations' promising phytoremediation potential, particularly for addressing heavy metal Zn contamination in the Yangtze River Delta. The removal rate of total Zn in metasequoia + ryegrass was the highest（26.24%）, and the removal rate in the early stage （16.10%）was higher than that in the whole restoration cycle（14.77%）, this pairing exhibited superior remediation performance, the most efficient repair dynamics, and the swiftest remediation timeline. Ryegrass exhibited the most potent enrichment capacity with a bioconcentration factor of 2.02, significantly outperforming pentacanthus awn and reeds in Zn uptake（P<0.05）, indicating its robust and stable ability to absorb Zn and its classification as a root-accumulating species. The indigenous metasequoia displayed commendable soil fertility maintenance capabilities, contributing significantly to enhanced soil fertility during the combined plant remediation process, and holds profound importance for the remediation of analogous enduring Zn pollution scenarios. |
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