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| 干湿交替和冻融循环下微塑料对红壤碳库稳定性的影响 |
| Effect of microplastic on the stability of carbon pools in red soil under wet-dry alternation and freeze-thaw cycle? |
| 投稿时间：2026-03-26 修订日期：2026-07-25 |
| DOI： |
| 中文关键词: 微塑料 土壤固碳 土壤碳组分 二氧化碳排放 土壤酶活性 |
| 英文关键词: Microplastics soil carbon sequestration soil carbon fractions carbon dioxide emissions soil enzyme activity |
| 基金项目:国家自然科学基金青年科学基金(52400211)；岳麓山实验室联合引进人才项目(2024RC2046) |
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| 中文摘要: |
| 为探讨不同类型微塑料在不同环境条件下对酸性红壤的碳库影响，本研究通过90天的培养实验，评估了聚乙烯（PE）、聚己二酸丁二醇酯共聚物（PBAT）和聚乳酸（PLA）三种微塑料在恒温恒湿（HW）、冻融循环（DR）和干湿交替（GS）环境下对酸性红壤有机碳库的影响。研究结果表明，微塑料添加普遍提高了土壤总有机碳（SOC）含量，但可生物降解微塑料（PBAT和PLA）对SOC的提升作用普遍强于传统塑料PE，尤其在HW和DR动态环境下更为显著。同时，微塑料添加均降低了稳定性碳组分占比，驱动土壤碳库由稳定态向活性态迁移。其中，PE处理在所有环境下土壤稳定性碳组分占比均最低，为17.5%-31.1%；其次是PBAT处理，稳定态碳组分占比为25.9%-43.4%；再次为PLA处理，稳定态碳占比为43.6%~59.2%。此外，PBAT和PLA显著抑制蔗糖酶活性，对β-葡萄糖苷酶活性呈环境依赖性调控，并显著促进CO?排放，而PE对酶活及CO?排放均无显著影响。研究表明，PBAT和PLA通过降解产物输入和微生物激活参与碳转化，显著促进活性碳组分增加与CO?排放，使碳库稳定性下降。而PE则以物理阻隔为主，并通过抑制微生物活动，导致土壤碳库稳定性最低。 |
| 英文摘要: |
| To investigate the effects of different types of microplastics on the carbon pool of acidic red soil under different environmental conditions, this study evaluated the effects of three types of microplastics, polyethylene (PE), polybutylene adipate copolymer (PBAT), and polylactic acid (PLA), on the organic carbon pool of acidic red soil under constant temperature and humidity (HW), freeze-thaw cycle (DR), and wet-dry alternation (GS) environments through a 90 day cultivation experiment. The research results indicate that the addition of microplastics generally increases the total organic carbon (SOC) content of soil, but biodegradable microplastics (PBAT and PLA) generally have a stronger effect on SOC enhancement than traditional plastic PE, especially in HW and DR dynamic environments. At the same time, the addition of microplastics reduces the proportion of stable carbon components, driving the migration of soil carbon pools from stable to active states. Among them, PE treatment had the lowest proportion of soil stability carbon components in all environments, ranging from 17.5% to 31.1%; Next is PBAT treatment, with stable carbon components accounting for 25.9% -43.4%; For PLA treatment again, the proportion of stable carbon is 43.6% to 59.2%. In addition, PBAT and PLA significantly inhibit sucrase activity, regulate β-glucosidase activity in an environmentally dependent manner, and significantly promote CO? emissions, while PE has no significant effect on enzyme activity and CO? emissions. Research has shown that PBAT and PLA participate in carbon conversion through degradation product input and microbial activation, significantly promoting an increase in activated carbon components and CO? emissions, leading to a decrease in carbon pool stability. PE, on the other hand, mainly relies on physical barriers and suppresses microbial activity, resulting in the lowest stability of soil carbon pools. |
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