可生物降解的微塑料和Cd共同污染对Cd生物可用性和土壤植物系统中的塑层的影响
Xuechun Shao1, Weiyu Liang1, Kailin Gong1
1School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
Chemosphere
|November 28, 2024
概括
可生物降解的微塑料 (BMPs) 通过改变土壤特性间接增加土壤中的 (Cd) 的生物可用性,其中聚乳酸 (PLA) MPs比聚乙烯-基酸盐-共甲 (PBAT) MPs更容易降解.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生态毒理学 生态毒理学
背景情况:
- 可生物降解塑料 (BPs) 被推广为传统塑料的环保替代品.
- 关于农业土壤中可生物降解微塑料 (BMP) 与 (Cd) 等重金属之间的相互作用的数据有限.
研究的目的:
- 为了研究聚乳酸 (PLA) 和聚乙烯-合物-共甲酸 (PBAT) 微塑料对 (Cd) 在生菜种植土壤中的生物可用性的影响.
- 为了比较薄膜扩散梯度 (DGT) 和甲基胺酸 (DTPA) 提取方法在预测BMP处理土壤中的Cd生物利用性的有效性.
- 评估BMP和Cd共同暴露对土壤微生物群落和BMP降解的影响.
主要方法:
- 菜在被BMP (PLA和PBAT) 和Cd污染的土壤中长了35天.
- 使用DGT和DTPA提取评估了Cd的生物利用性.
- 分析了土壤特性 (pH,CEC,DOC) 和微生物群落组成.
- 研究了BMP降解和微塑料上的微生物殖民.
主要成果:
- 与DTPA提取不同的是,DGT方法准确地预测了BMP处理的非树叶球土壤中的Cd生物可用性 (R2 = 0.902),与DTPA提取不同.
- BMPs通过降低土壤pH值,阴离子交换能力 (CEC) 和溶解有机碳 (DOC) 来间接增加Cd的生物可用性.
- 在根球中,PLA MPs显示出比PBAT MPs更大的降解和表面变化.
- 暴露于Cd影响了土壤微生物群落,但没有影响BMP群落;然而,同时暴露于BMP和Cd减少了真菌社区网络的复杂性.
结论:
- BMPs,特别是PLA,在土壤中经历降解,影响土壤特性和Cd生物可用性.
- DGT是一种可靠的方法,用于评估BMP污染土壤中的Cd生物可用性.
- BMP和Cd的同时暴露会对土壤真菌群体结构产生负面影响,突出了潜在的生态风险.
相关概念视频
Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
What are Biogeochemical Cycles?
31.0K
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
31.0K
Environmental Applications of Microorganisms
2
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
2
The Soil Ecosystem
19.6K
Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
19.6K
The Roles of Bacteria and Fungi in Plant Nutrition
35.1K
Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
35.1K


