<br>微塑料对湿地土壤凋落物分解的影响,Environmental Pollution

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微塑料对湿地土壤凋落物分解的影响
Environmental Pollution ( IF 7.6 ) Pub Date : 2023-12-12 , DOI: 10.1016/j.envpol.2023.123145
Yujing Ren ₁ , Yueling Qi ₁ , Xin Wang ₁ , Xinyi Duan ₁ , Xiaoxin Ye ₁

Affiliation

微塑料（MP）可能会干扰土壤的主要生态过程，这已成为一个日益严重的全球环境问题。在陆地生态系统中，凋落物分解是养分循环的主要过程，特别是碳 (C) 和氮 (N) 循环。然而，微塑料污染如何改变湿地垃圾分解却几乎没有被研究过。因此，利用升金湖湿地土壤进行了为期100天的实验室规模的凋落物分解实验，该土壤用两种类型的MP（聚乙烯，PE和聚氯乙烯，PVC）以三种浓度（0.1％、0.5％和2.5％）处理。 %, w/w)，探讨 MP 积累是否以及如何影响湿地凋落物分解过程。根据我们的研究，PE和PVC大大减缓了湿地垃圾的分解速度。与对照处理相比，MP的添加降低了凋落物质量（高C:N），降低了与凋落物分解相关的土壤酶活性，降低了细菌多样性，并改变了微生物群落结构和与凋落物分解相关的潜在功能基因丰度。这些发现揭示了MPs可能影响湿地生态系统C、N循环的主要过程，为进一步研究湿地生态系统功能提供了重要线索。

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Effects of microplastics on litter decomposition in wetland soil

Microplastics (MPs) may interfere with the primary ecological processes of soil, which has become a growing global environmental issue. In terrestrial ecosystems, litter decomposition is the main process of nutrient cycling, particularly for carbon (C) and nitrogen (N). However, how microplastic pollution could alter wetland litter decomposition has barely been investigated. Therefore, a 100-day lab-scale litter decomposition experiment was conducted using Shengjin Lake wetland soil, which was treated with two types of MPs (polyethylene, PE and polyvinyl chloride, PVC) at three concentrations (0.1%, 0.5%, and 2.5%, w/w), to explore if and how MPs accumulation could affect wetland litter decomposition processes. According to our research, the PE and PVC greatly slowed the decomposition rate of wetland litter. Compared with control treatments, the addition of MPs decreased litter quality (high C:N), reduced litter decomposition-related soil enzyme activity, decreased the diversity of bacteria, and altered microbial community structure and potential functional gene abundance linked to litter decomposition. These findings revealed that MPs could affect the main process of C and N cycling in wetland ecosystems, providing important cues for further research on the wetland ecosystem function.

更新日期：2023-12-12

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