Wang Shu-Tao, Wang Wan-Qing, Rong Sa-Shuang, Li Yu-Xin, Wang Xin-Xin, Liang Pan, Liu Wei
College of Land and Resources, Hebei Agricultural University, Baoding 071001, China.
Key Laboratory for Farmland Eco-Environment of Hebei, Baoding 071001, China.
Huan Jing Ke Xue. 2024 Aug 8;45(8):4756-4765. doi: 10.13227/j.hjkx.202308166.
In the agricultural lands of China, polyethylene is the main component of microplastics （MPs）, with characteristics such as small size, wide distribution, easy accumulation, and difficult degradation. Therefore, it may have an impact on the elemental cycling process of the soil. On the basis of reviewing the key literatures in the past few years, this study systematically analyzed and summarized the key factors and processes of the polyethylene microplastics （PE-MPs） affecting soil nitrogen transformation. On the one hand, PE-MPs directly affected the activities of microorganisms and key enzymes related to soil nitrogen transformation by enriching microorganisms, selecting colonized microbial populations, and releasing additives. On the other hand, PE-MPs had indirect impacts on the activities of microorganisms and key enzymes related to soil nitrogen transformation by affecting soil physicochemical properties of soil and changing the microenvironment for microbial growth. Moreover, phthalates, an important additive of the MPs, may be the key factor affecting soil nitrogen transformation in the short-term. Finally, we posed key scientific issues that should be further studied in order to provide scientific support for nitrogen nutrition regulation and ecological risk assessment of soils contaminated by PE-MPs.
在中国的农田中，聚乙烯是微塑料（MPs）的主要成分，具有粒径小、分布广、易积累、难降解等特点。因此，其可能会对土壤的元素循环过程产生影响。在查阅过去几年关键文献的基础上，本研究系统分析并总结了聚乙烯微塑料（PE-MPs）影响土壤氮转化的关键因素和过程。一方面，PE-MPs通过富集微生物、筛选定殖微生物种群以及释放添加剂，直接影响与土壤氮转化相关的微生物和关键酶的活性。另一方面，PE-MPs通过影响土壤理化性质、改变微生物生长微环境，间接影响与土壤氮转化相关的微生物和关键酶的活性。此外，MPs的一种重要添加剂邻苯二甲酸盐可能是短期内影响土壤氮转化的关键因素。最后，我们提出了一些有待进一步研究的关键科学问题，以便为受PE-MPs污染土壤的氮营养调控和生态风险评估提供科学支持。
