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| Effects of low density polyethylene microplastics on soil aggregate stability and enzyme ecological stoichiometric characteristics |
| Received:November 29, 2024 |
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| KeyWord:microplastics;aggregate stability;soil enzyme activity;ecological stoichiometric characteristics of enzyme |
| Author Name | Affiliation | E-mail | | JIN Yidan | State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
College of Environmental and Resource Sciences/College of Carbon Neutrality, Zhejiang A&F University, Hangzhou 311300, China | | | ZHOU Ying | State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
College of Environmental and Resource Sciences/College of Carbon Neutrality, Zhejiang A&F University, Hangzhou 311300, China | | | JIAN Yongqi | Jiyang College of Zhejiang A&F University, Shaoxing 311800, China | | | WANG Xinyu | College of Environmental and Resource Sciences/College of Carbon Neutrality, Zhejiang A&F University, Hangzhou 311300, China | | | WANG Xiuxiu | Qingtian County Forestry Farm of Zhejiang Province, Lishui 323900, China | | | CHEN Youchao | State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
College of Environmental and Resource Sciences/College of Carbon Neutrality, Zhejiang A&F University, Hangzhou 311300, China | chenyouchao@zafu.edu.cn | | CAI Yanjiang | State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
College of Environmental and Resource Sciences/College of Carbon Neutrality, Zhejiang A&F University, Hangzhou 311300, China | |
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| Abstract: |
| To explore the effects of different mass fractions of microplastics on the structure of farmland soil aggregates and the ecological stoichiometric characteristics of soil enzyme carbon, nitrogen, and phosphorus, a rotation pot experiment of three vegetables, namely water spinach, pakchoi, and amaranth, was set up. Low-density polyethylene microplastics（LDPE MPs）with different mass fractions（0, 0.2%, 5%, and 10%）were added. The changes in the distribution and stability of soil aggregates after being polluted by microplastics were analyzed, and the activities of soil enzymes and their ecological stoichiometric characteristics were discussed. The results showed that in the soils treated with different mass fractions of LDPE MPs, the aggregates with a particle size of <0.053 mm had the highest content proportion（39.67% - 50.41%）, and the aggregates with a particle size >2 mm had the lowest content proportion（4.74% - 8.88%）. The content of aggregates with a particle size >0.25 mm（R0.25）, mean weight diameter（MWD）, and geometric mean diameter（GMD）under the addition of different mass fractions of LDPE MPs were all lower than those of the control soil（CK）. The addition of LDPE MPs at a mass fraction of 0.2%（PE1）significantly increased the activities of carbon-related soil enzymes, while the addition of LDPE MPs at a mass fraction of 10%（PE3）significantly decreased the activities of carbon- and nitrogen-related soil enzymes. However, the addition of LDPE MPs had no significant effect on the activity of soil phosphatase. Based on the analysis of enzyme stoichiometric vectors, it was shown that the vector length under the PE1 treatment was significantly higher than that under the CK treatment, while the vector length under the PE3 treatment was significantly lower than that under the CK treatment（P<0.05）. The vector angles of enzyme stoichiometry were all greater than 45°, and with the increase in the addition amount of microplastics, the vector angles showed a continuous increasing trend. In conclusion, the addition of LDPE MPs at different mass fractions had a certain destructive effect on the structure of soil aggregates. LDPE MPs at a mass fraction of 0.2% enhanced the carbon limitation in the soil, and LDPE MPs at a mass fraction of 10% weakened the carbon limitation in the soil. With the increase in the concentration of microplastics, the phosphorus limitation gradually increased. Redundancy analysis showed that there was a significant positive correlation between the activities of carbon-related soil enzymes and the stability of soil aggregates. |
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