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| Ecological effects of PLA and PBAT biodegradable microplastics on soil-plant systems |
| Received:April 09, 2024 |
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| KeyWord:biodegradable material;microplastics;soil physicochemical properties;plant physiology and biochemistry;soil health |
| Author Name | Affiliation | E-mail | | XIN xiwei | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi 'an 710021, China | | | CHEN chen | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi 'an 710021, China | | | WU wanqing | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi 'an 710021, China | | | CHEN qian | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi 'an 710021, China | | | LI chengtao | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi 'an 710021, China | lct515@163.com |
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| Abstract: |
| In order to investigate the effects of biodegradable microplastics on soil-plant systems after burial. In this study, a Shanghai Qing pot experiment was conducted to separately add PLA and PBAT biodegradable microplastics. By observing the surface morphological changes of the two microplastics in soil, measuring the physical and chemical properties of soil and the physiological and biochemical indexes of Shanghai green, to comprehensively evaluate the impact of PLA and PBAT microplastics on soil ecological and environmental risks. The results showed that both kinds of microplastics degraded within 30 days. Cracks and protrusions of different degrees appeared on the surface of PLA microplastics, while irregular holes appeared on the surface of PBAT microplastics. The addition of PLA can increase the content of total N（TN）in soil and decrease the content of total P（TP）, while PBAT can promote both TN and TP in soil, and both kinds of microplastics can increase the large aggregates of water stability in soil. Correlation analysis revealed that the addition of PLA microplastics resulted in a positive correlation between TP and malondialdehyde（MDA）content as well as root activity, while TN showed a negative correlation with MDA content and root activity. Following the addition of PBAT microplastics, TP exhibited a negative correlation with MDA content, root length, and stem length, whereas MDA content displayed a positive correlation with root activity, root length, and stem length.Excessive amounts added had a more pronounced effect on the plant; however, surpassing the plant's tolerance range may lead to adverse effects. Studies suggest that biodegradable microplastics could potentially have more complex ecological effects on the soil-plant system. |
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