微塑料可通过影响栽培土壤中的土壤团聚体分布和微生物群落结构来抑制有机碳矿化:来自一年盆栽实验的证据

Agronomy Pub Date : 2024-09-17 DOI:10.3390/agronomy14092114
Zonghai Chen, Quan Wan, Pengyu Zhou, Haochen Li, Yige Liu, Ying Lu, Bo Li
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引用次数: 0

摘要

微塑料(MPs)污染已成为一个全球性污染问题,有可能影响土壤碳循环和农业系统结构的稳定性。然而,MPs 污染对土壤有机碳组分/转化和土壤团聚体稳定性的影响仍然未知。因此,研究人员进行了为期一年的盆栽实验和短期矿化培养实验,实验涉及参照物(CK,无 MPs)、不同浓度(0.1、1 和 2 w/w % 聚乙烯(PE))和不同类型(0.1 w/w % 聚乙烯(PE)、聚丙烯(PP)和聚氯乙烯(PVC))的 MPs,以研究添加 MPs 一年后对土壤团聚体稳定性和有机碳矿化的影响。结果表明,土壤部分团聚体的粒度分布受 MP 浓度和类型的影响较大(p ˂0.05)。与 0.1% PE 相比,2% PE 的 MWD(平均重量直径)和 GMD(几何平均直径)分别显著增加了 27.22% 和 32.73%。此外,高浓度(>1%)的 PE 能显著降低溶解性有机碳(DOC)(p ˂0.05),而显著增加稳定碳组分,包括颗粒有机碳(POC)和矿物结合有机碳(MOC)(p ˂0.01)。同时,与 CK 相比,两种 MP 类型和剂量都明显降低了土壤有机碳矿化率(SOCMR)和累积矿化量(CM)(p ˂0.001)。此外,MPs 使磷脂脂肪酸总量(PLFA)明显增加了 261.9-438.8%(p ˂0.01),土壤 pH 值和磷脂脂肪酸总量是 MPs 影响 SOCMR 的主要因素。因此,高浓度(>1%)的聚乙烯会影响土壤 pH 值、TN 值、大颗粒物(R>0.25)含量和微生物群落组成,从而显著降低 SOCMR。该研究为 MPs 污染对华南耕地土壤 C 动态和团聚体的反馈作用提供了证据。
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Microplastics Can Inhibit Organic Carbon Mineralization by Influencing Soil Aggregate Distribution and Microbial Community Structure in Cultivated Soil: Evidence from a One-Year Pot Experiment
Microplastics (MPs) pollution has become a global pollution problem, potentially affecting soil carbon cycling and structure stability in agricultural systems. However, the effects of MPs pollution on soil organic carbon fractions/transformation and soil aggregate stability remain unknown. Thus, a combination of one-year pot and short-term mineralized incubation experiments that involved a reference (CK, with no MPs), different concentrations (0.1, 1, and 2 w/w % polyethylene (PE)), and types (0.1 w/w % PE, polypropylene (PP), and polyvinyl chloride (PVC)) of MPs were carried out to investigate the effects on the soil aggregate stability and organic carbon mineralization after one year of adding MPs. The results showed that the size distribution of the soil partial aggregates varied significantly as affected by the MP concentration and type (p ˂ 0.05). Compared with 0.1% PE, significant increases in the MWD (mean weight diameter) and GMD (geometric mean diameter) of 2% PE of 27.22% and 32.73%, respectively, were detected. In addition, high concentrations (>1%) of PE significantly decreased the dissolved organic carbon (DOC) (p ˂ 0.05), whereas they significantly increased the stable carbon fractions including the particulate organic carbon (POC) and mineral-bound organic carbon (MOC) (p ˂ 0.01). Meanwhile, compared with the CK, both MP types and doses significantly decreased the soil organic carbon mineralization rate (SOCMR) and cumulative mineralization amount (CM) (p ˂ 0.001). Moreover, the MPs significantly increased the total PLFA (phospholipid fatty acid) by 261.9–438.8% (p ˂ 0.01), and the soil pH and total PLFA were the dominant factors that affected the SOCMR as affected by MPs. Thus, a high concentration (>1%) of PE significantly decreased the SOCMR by influencing the soil pH, TN, and macroaggregate (R>0.25) content and microbial community composition. This study provided evidence of the feedback of MPs pollution on soil C dynamic and aggregates in cultivated soil in South China.
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