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| Effects of chicken-manure biochar application on the soil quality of polylactic acid microplastic-contaminated acidic soil |
| Received:April 26, 2023 |
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| KeyWord:polylactic acid microplastic;biochar;soil physicochemical property;enzyme activity;acidic soil |
| Author Name | Affiliation | | ZOU Xiaoyan | Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | CAO Kaibo | Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
University of Chinese Academy of Sciences, Beijing 101408, China
College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | WANG Qiang | Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
College of Environment & Safety Engineering, Fuzhou University, Fuzhou 350108, China | | WANG Yin | Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China |
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| Abstract: |
| Recently, biodegradable plastics were proposed to solve the issue of microplastic particles（MPs）. However, biodegradable MPs may pose stronger negative effects on several soil species than traditional MPs under some conditions. Biochar has been widely used in soil improvement and remediation, but the effects of biochar application on the physicochemical properties of the soil are still limited. Therefore, polylactic acid（PLA）MPs were selected as the research object, and a half-year soil culture experiment was conducted to analyze the effects of chicken-manure biochar on the quality of PLA-MP polluted soils. The results revealed that PLA-MPs pollution caused an increase of soil pH, posed the loss of nutrients（e. g., nitrogen, phosphorus, and potassium）, and influenced the soil carbon turnover. The alkalization of acidic soils and the varying upregulated activities of urease and invertase were observed post chicken-manure biochar application. Furthermore at the end of soil incubation clear increase in the available phosphorus and potassium with 61.08% and 6.10 times, respectively, was observed in PLA-MP polluted soils; however, a remarkable decline in inorganic nitrogen with 64.31% was observed. Under the synergistic effects of PLA-MPs and biochar, the net total carbon variable was significantly positively correlated with that of in PLA-MPs polluted soils. This study demonstrates that the biochar application slows down the PLA-MPs induced nutrient loss and that the soil total carbon turnover and nitrogen transformations are synergistically affected by biochar and PLA-MPs. |
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