Biodegradable and conventional mulches inhibit nitrogen fixation by peanut root nodules - potentially related to microplastics in the soil

文献类型： 外文期刊

第一作者： Guo, Wei

作者： Guo, Wei;Li, Jizhi;Chi, Guangyu;Lu, Caiyan;Ma, Jian;Hu, Yanyu;Zhu, Bin;Yang, Miaoyin;Chen, Xin;Guo, Wei;Li, Jizhi;Zhu, Bin;Yang, Miaoyin;Liu, Huiying;Wu, Zhengfeng

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关键词： Mulching; Microplastics; Leguminous plants; Symbiotic nitrogen fixation; Isotopes

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： 2024 年 480 卷

页码：

收录情况： SCI

摘要： Mulching has been demonstrated to improve the soil environment and promote plant growth. However, the effects of mulching and mulch-derived microplastics (MPs) on nitrogen fixation by root nodules remain unclear. In this study, we investigated the effects of polyethylene (PE) and polylactic acid-polybutylene adipate-coterephthalate (PLA-PBAT) film mulching on nitrogen fixation by root nodules after 4 years of continuous mulching using 15N tracer technology. Additionally, we examined the relationship between nitrogen fixation and MPs. We found a reduction in the proportion of nitrogen fixation by nodules (54.3 %-58.7 %) due to mulching. This decrease may be attributed to reduced dinitrogenase activity and flavonoid content at the seedling stage caused by mulching, and mulching with PLA-PBAT films significantly decreased the abundance of Bradyrhizobium at maturity. Furthermore, combined analysis of nitrogen-fixing bacteria (nifH) and metabolomes indicated that N-lauroylethanolamine may act as a regulatory signal influencing the root nodule nitrogen fixation process and that mulching resulted in significant changes in its content. The mantel test and PLS-PM suggest that microplastic from mulching may harm root nodule nitrogen fixation. This study reveals the influence of mulching on plant nitrogen uptake and the potential threat of mulch -derived microplastics, with a special focus on root nodule nitrogen fixation.

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