Abstract：
Soil organic carbon (SOC) pool, the largest part of terrestrial ecosystem, controls global terrestrial carbon balance and consequently presented carbon cycle-climate feedback in climate projections. Microplastics, (MPs, <5 mm) as common pollutants in soil ecosystems, have an obvious impact on soil-borne carbon circulation by affecting soil microbial processes, which play a central role in regulating SOC conversion. In this review, we initially presented the sources, properties and ecological risks of MPs in soil ecosystem, and then the differentiated effects of MPs on the component of SOC, including dissolved organic carbon, soil microbial biomass carbon and easily oxidized organic carbon varying with the types and concentrations of MPs, the soil types, etc. As research turns into a broader perspective, greenhouse gas emissions dominated by the mineralization of SOC coming into view since it can be significantly affected by MPs and is closely associated with soil microbial respiration. The pathways of MPs impacting soil microbes-driven carbon conversion include changing microbial community structure and composition, the functional enzyme\'s activity and the abundance and expression of functional genes. However, numerous uncertainties still exist regarding the microbial mechanisms in the deeper biochemical process. More comprehensive studies are necessary to explore the affected footprint and provide guidance for finding the evaluation criterion of MPs affecting climate change.
摘要：
土壤有机碳（SOC）库，陆地生态系统的最大部分，控制全球陆地碳平衡，因此在气候预测中提出了碳循环-气候反馈。微塑料,（国会议员，<5毫米)作为土壤生态系统中的常见污染物，通过影响土壤微生物过程，对土壤碳循环产生明显影响，在调节SOC转换中起着核心作用。在这次审查中,我们最初提出了来源，土壤生态系统中MPs的性质和生态风险，然后是MPs对SOC成分的不同影响，包括溶解的有机碳，土壤微生物生物量碳和易氧化有机碳随着MPs的类型和浓度而变化，土壤类型,等。随着研究进入更广阔的视野，以SOC矿化为主的温室气体排放，因为它可能受到MP的显着影响，并且与土壤微生物呼吸密切相关。MPs影响土壤微生物驱动碳转化的途径包括改变微生物群落结构和组成，功能酶的活性和功能基因的丰度和表达。然而,关于深层生化过程中的微生物机制仍然存在许多不确定性。需要更全面的研究来探索受影响的足迹，并为寻找影响气候变化的MP的评估标准提供指导。
