From biodegradation to biohazard: Polylactic acid microplastics induced rice growth inhibition in agroecosystems
文献类型： 外文期刊
作者： Lin, Bigui 1 ; Fan, Qingfang 1 ; Liu, Fang 1 ; Wang, Luya 1 ; Wei, Chaoxian 1 ; Liu, Beibei 1 ; Zhao, Juan 1 ; Zuo, Linzi 5 ; Xie, Yi 6 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Haikou 571101, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Low Carbon Green Agr Trop Reg China, Danzhou 571737, Peoples R China
3.Guizhou Univ, Ctr R&D Fine Chem, Natl Key Lab Green Pesticide, Key Lab Green Pesticide & Agr Bioengn,Minist Educ, Guiyang 550025, Peoples R China
4.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China
5.Guangdong Univ Technol, Anal & Test Ctr, Guangzhou 510006, Peoples R China
6.Chinese Acad Trop Agr Sci, Anal & Test Ctr, Haikou 571101, Peoples R China
关键词： Polylactic acid microplastics (PLA-MPs); Soil nitrogen-phosphorus cycling; Phytotoxicity; Degradation; Agroecosystems
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）
ISSN： 0304-3894
年卷期： 2025 年 496 卷
页码：
收录情况： SCI
摘要： The increasing use of biodegradable plastics necessitates critical evaluation of their environmental safety. This study investigated the effects of polylactic acid microplastics (PLA-MPs, 0.1-2.5 % w/w) on rice-soil systems using controlled pot experiments integrated with enzymatic assays, rhizosphere bacterial profiling, and non-target analysis of degradation products. PLA-MPs exposure inhibited rice growth by reducing photosynthetic efficiency and root development, which was associated with decreased nitrogen availability (30-60 % reduction in NH+4/NO-3-N), altered phosphorus levels, and reduced microbial alpha-diversity. Foliar fertilization alleviated phytotoxic effects by improving antioxidant responses and nutrient uptake. Non-target screening identified lactic acid derivatives as dominant degradation products, with limited long-term persistence. The degradation rate of PLA-MPs was estimated at 0.065 mg & sdot;d-1 under soil conditions. These results indicate that PLA-MPs, despite their biodegradable nature, can adversely affect soil nutrient cycling and crop performance. These findings emphasize the need to re-evaluate biodegradable plastic use in agriculture and promote integrated mitigation strategies to reduce microplastic-induced stress and support sustainable soil-plant systems.
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