农业环境科学学报2025，Vol.44Issue(10)：2560-2570,11.DOI:10.11654/jaes.2024-1040
低密度聚乙烯微塑料对土壤团聚体稳定性及酶生态化学计量特征的影响
Effects of low density polyethylene microplastics on soil aggregate stability and enzyme ecological stoichiometric characteristics
摘要
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.关键词
微塑料/团聚体稳定性/土壤酶活性/酶生态化学计量特征Key words
microplastics/aggregate stability/soil enzyme activity/ecological stoichiometric characteristics of enzyme分类
农业科技引用本文复制引用
靳一丹,周颖,简永旗,王欣妤,王秀秀,陈有超,蔡延江..低密度聚乙烯微塑料对土壤团聚体稳定性及酶生态化学计量特征的影响[J].农业环境科学学报,2025,44(10):2560-2570,11.基金项目
浙江省"三农九方"科技协作计划项目(2023SNJF037) （2023SNJF037）
文成县科技计划项目(2021NKY02) （2021NKY02）
浙江农林大学大学生科研训练项目(2024kx0021)Zhejiang Provincial Department of Agriculture and Rural Affairs(2023SNJF037) （2024kx0021）
Wencheng County Science and Technology Project(2021NKY02) （2021NKY02）
Zhejiang A&F University Student Research Training Program(2024kx0021) （2024kx0021）
