| 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. |
| 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 |
| 投稿时间：2024-11-29 |
| DOI：10.11654/jaes.2024-1040 |
| 中文关键词: 微塑料 团聚体稳定性 土壤酶活性 酶生态化学计量特征 |
| 英文关键词: microplastics aggregate stability soil enzyme activity ecological stoichiometric characteristics of enzyme |
| 基金项目:浙江省“三农九方”科技协作计划项目（2023SNJF037）；文成县科技计划项目（2021NKY02）；浙江农林大学大学生科研训练项目（2024kx0021） |
| 作者 | 单位 | E-mail | | 靳一丹 | 浙江农林大学省部共建亚热带森林培育国家重点实验室, 杭州 311300
浙江农林大学环境与资源学院/碳中和学院, 杭州 311300 | | | 周颖 | 浙江农林大学省部共建亚热带森林培育国家重点实验室, 杭州 311300
浙江农林大学环境与资源学院/碳中和学院, 杭州 311300 | | | 简永旗 | 浙江农林大学暨阳学院, 浙江 绍兴 311800 | | | 王欣妤 | 浙江农林大学环境与资源学院/碳中和学院, 杭州 311300 | | | 王秀秀 | 浙江省青田县林业总场, 浙江 丽水 323900 | | | 陈有超 | 浙江农林大学省部共建亚热带森林培育国家重点实验室, 杭州 311300
浙江农林大学环境与资源学院/碳中和学院, 杭州 311300 | chenyouchao@zafu.edu.cn | | 蔡延江 | 浙江农林大学省部共建亚热带森林培育国家重点实验室, 杭州 311300
浙江农林大学环境与资源学院/碳中和学院, 杭州 311300 | |
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| 中文摘要: |
| 为探究不同质量分数微塑料对农田土壤团聚体结构及土壤酶碳、氮、磷生态化学计量特征的影响，通过设置空心菜-青菜-苋菜3种蔬菜的轮作盆栽试验，添加不同质量分数的低密度聚乙烯微塑料（LDPE MPs）（0、0.2%、5%和10%），分析受微塑料污染后土壤团聚体分布和团聚体稳定性的变化，并探讨土壤酶活性及其生态化学计量特征。结果显示：不同质量分数LDPE MPs处理下的土壤均表现为<0.053 mm粒径团聚体的含量占比最高（39.67%~50.41%），粒径>2 mm的大团聚体含量占比最小（4.74%~8.88%）；不同质量分数LDPE MPs添加下的 R0.25（粒径>0.25 mm团聚体含量）、平均质量直径（MWD）和几何平均直径（GMD）均低于对照组（CK）土壤；质量分数为0.2%的LDPE MPs（PE1）显著增加土壤碳相关酶活性，质量分数为10%的LDPE MPs（PE3）显著降低土壤碳、氮相关酶活性，而LDPE MPs的添加对土壤磷相关酶活性无显著影响。基于酶化学计量矢量分析显示：PE1处理下矢量长度显著高于 CK处理，而PE3处理下矢量长度显著低于CK处理（P<0.05）。酶化学计量的矢量角度均大于45°，且随着微塑料添加量的增加，矢量角度呈现不断增大的趋势。研究表明：不同质量分数LDPE MPs的添加均对土壤团聚体结构产生一定的破坏性；0.2%LDPE MPs增强了土壤碳限制、10%LDPE MPs减弱了土壤碳限制；随着微塑料添加量的增加，磷限制逐渐增强；冗余分析表明土壤碳相关酶活性和土壤团聚体稳定性呈现显著正相关。 |
| 英文摘要: |
| 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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