| 王国兵,许美玲,姚宇,徐艺苇,周鹏,杨建波,樊鹏.全氟辛酸和微塑料共暴露对土壤呼吸和酶活性的影响及机制研究[J].农业环境科学学报,2026,45(9):2272-2283. |
| 全氟辛酸和微塑料共暴露对土壤呼吸和酶活性的影响及机制研究 |
| Effects and mechanisms of co-exposure to perfluorooctanoic acid and microplastics on soil respiration and enzyme activity |
| 投稿时间：2025-09-18 |
| DOI：10.11654/jaes.2025-0877 |
| 中文关键词: 微塑料 全氟辛酸 土壤呼吸 土壤酶活性 土壤DOM |
| 英文关键词: microplastics PFOA soil respiration soil enzyme activities soil DOM |
| 基金项目:河南省科学院基本科研费项目（20250601012，20250601011）；河南省科学技术厅河南省科学院科技研发计划联合基金（225200810104，235200810045） |
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| 中文摘要: |
| 全氟化合物和微塑料在环境中的生态风险被广泛关注，而两者共暴露对土壤理化性质和功能的研究较少。本文研究了全氟辛酸（PFOA）与典型微塑料[聚乙烯（PE）和聚乳酸（PLA）]单一及复合污染对土壤呼吸、酶活性及土壤有机质特性的影响与作用机制。结果表明：PFOA对土壤呼吸和酶活性的影响呈现出“低促高抑”现象，低浓度PFOA（0.1%）及其与微塑料复合显著促进土壤呼吸与有机碳矿化，并促进土壤磷酸酶和过氧化氢酶活性，而高浓度PFOA（1%）则产生抑制；PFOA强烈抑制脲酶活性（降低82.2%~97.7%）并改变氮形态（增加NH+4-N、降低NO-3-N），显著抑制硝化过程；可降解PLA微塑料对土壤pH、有机质及酶活性的影响普遍大于传统PE微塑料；光谱学分析表明，复合污染降低了溶解性有机质（DOM）腐殖化程度（腐殖化指数降低），傅里叶红外光谱（FTIR）表明PLA微塑料与PFOA复合引入了新的官能团并增强了羰基信号，增加了有机质的复杂性。研究表明，PFOA与微塑料复合污染通过改变土壤理化性质与DOM特性，干扰微生物代谢与碳氮磷循环关键酶活性，从而显著影响土壤生态功能。 |
| 英文摘要: |
| The risk of perfluorinated compounds and microplastics（MPs）in environment have attracted widespread attention, however, the effects of their co-exposure on soil physicochemical properties and functions have rarely investigated. This study investigated the impacts of single and combined pollution of perfluorooctanoic acid（PFOA）and typical MPs（PE-MPs, and PLA-MPs）on soil respiration, enzyme activities, and soil organic matter characteristics. The results revealed a "low-promotion and high-inhibition" effect of PFOA on soil respiration and enzyme activity：the PFOA at low concentration（0.1%）and its combination with MPs significantly enhanced soil respiration and organic carbon mineralization, as well as the activities of phosphatase and catalase, whereas PFOA at high concentrations（1%）exerted inhibitory effects. PFOA strongly inhibited urease activity（by 82.2%-97.7%）and altered nitrogen speciation（increased NH+4-N, decreased NO-3-N）, leading to suppressed nitrification process. The biodegradable PLA-MPs exerted greater influences on soil pH, organic matter, and enzyme activities compared to conventional PE. Spectroscopic analyses demonstrated that combined pollution reduced the humification degree of dissolved organic matter（DOM, indicated by decreased HIX values）, and Fourier-transform infrared spectroscopy showed that combined PLA-MPs and PFOA introduced new functional groups and enhanced carbonyl signals, increasing the complexity of soil organic matter. Overall, this study elucidates that combined PFOA and MPs affects soil ecological function by altering soil physicochemical properties and DOM characteristics, thereby interfering with microbial metabolism and key enzyme activities. |
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