聚乳酸微塑料对沉积物中蓝藻复苏的影响

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Abstract Sediments are important sites for cyanobacteria overwintering, and also be the sinks of microplastics (MPs) and nutrients. In this study, a laboratory experiment was conducted to explore the effects of biodegradable polylactic acid microplastics (PLA-MPs) on the recruitment of dormant cyanobacteria from sediment. Different content (0, 0.05%, 0.5%, 5%, w/w) of PLA-MPs were added to the sediment and then incubated under 15℃, with light intensity of 40μE/(m²·s) for 50days. Results showed that addition of 0.5% and 5% of PLA-MPs significantly increased the concentrations of NH₄⁺-N and NO₃^--N (P＜0.05) in the overlying water, which was 61.19 and 84.94 times, 5.80 and 17.01 times higher than that in the control, respectively. This was linked with the increase in the abundances of nitrogen fixation (nifH), nitrification(AOB-amoA、nxrB) and the reduction of denitrification (narG) genes. Besides, the abundance of the phoD gene that involved in organophosphorus mineralization, the oxygen penetration depth in sediment were also decreased with the presence of PLA-MPs, which probably promote the release of sedimentary phosphorus. Moreover, the relative abundance of the cyanobacterial phylum in the water increased significantly with the increase in PLA-MPs content, which was 12.38%, 23.53% and 28.54% higher than that of the control group, respectively, indicating that PLA-MPs promoted the recruitment of sedimentary cyanobacteria. These findings may extend the current understanding of the potential aquatic risk of biodegradable PLA-MPs.

Key words： polylactic acid microplastics cyanobacteria recruitment nitrogen phosphorus

Received: 07 October 2023

PACS:

X703.5

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	ZHANG Li-xue
	TANG Bing-ran
	LI Hong

Cite this article:

ZHANG Li-xue,TANG Bing-ran,LI Hong. Effects of polylactic acid microplastics on the recruitment of cyanobacteria from sediments[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2660-2671.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I5/2660

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