微塑料通过改变微生物群落和碳代谢,间接影响不同年龄森林的土壤呼吸
Wen Hu1, Zhenming Zhang2, Guiting Mu1
1College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China.
Journal of hazardous materials
|May 13, 2025
概括
森林土壤中的微塑料会改变微生物群落和碳代谢,影响土壤呼吸和二氧化碳排放. 较老的森林显示出更高的微塑料含量,影响碳循环.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 微塑料污染在陆地生态系统中越来越令人担忧.
- 森林土壤在全球碳循环中发挥着至关重要的作用.
- 微塑料对土壤微生物功能和呼吸的影响仍未得到充分研究.
研究的目的:
- 研究微塑料对不同年龄森林土壤呼吸的影响.
- 分析微塑料如何影响土壤微生物社区结构和碳代谢功能.
- 为了确定微塑料丰富度,土壤特性和二氧化碳排放之间的关系.
主要方法:
- 森林土壤中的量化微塑料丰富度和特征.
- 测量了土壤呼吸速率和分析了土壤pH值和总有机碳 (TOC).
- 利用功能预测分析和结构方程建模 (SEM) 来评估微生物代谢和途径.
主要成果:
- 微塑料的丰富程度在600-3858个物品·公斤-1之间,随着森林的年龄而增加.
- 微塑料主要由纤维和小颗粒组成,其中黑色颗粒成分很大.
- 随着森林年龄的增长,土壤呼吸能力下降,微塑料通过TOC和pH间接影响了土壤呼吸.
- 特定的代谢途径 (例如,甲同化) 与微塑料的丰富程度相关.
- 微塑料通过社区结构或直接途径影响改变微生物碳代谢.
结论:
- 微塑料通过改变微生物群落和森林中的碳代谢,显著影响土壤呼吸.
- 森林的年龄影响了微塑料的积累及其对土壤碳循环的后续影响.
- 了解这些相互作用对于评估森林土壤中微塑料诱导的碳排放至关重要.
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