数字农科院2.0

Residue retention improved the spreading risk of soil metal resistance genes in upland and paddy field

文献类型： 外文期刊

作者： Liu, Meixia;Fan, Yi;Guan, Yupeng;Wu, Yi;Meng, Tingwei;Hu, Zonghao;Pang, Shuang;Bello, Ayodeji;Zhang, Ximei;Yang, Wei

作者机构：

关键词： Land use type;Residue retention;Sampling stage;Metal resistance genes (MRGs);Bacterial host;Mobile genetic elements (MGEs)

期刊名称： JOURNAL OF HAZARDOUS MATERIALS

ISSN： 0304-3894

年卷期： 2025 年 501 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Residue retention is an effective, eco-friendly strategy for improving soil fertility, but it also raises concerns about the mobilization and redistribution of metals within the agricultural ecosystems. Paddy fields in particular are highly prone to metal accumulation and spread. Metal resistance genes (MRGs) have emerged as promising biomarkers for ecological risk assessment, offering considerable potential for environmental monitoring and contamination evaluation. However, the influence of residue retention on MRGs and its interaction with land use type remain largely unclear. In this study, we examined the effects of residue retention and land use type on MRGs during the seedling, mature stage and freezing period using a field experiment in the Sanjiang Plain, Northeast China. In total, 163 MRGs representing 54 MRG types were detected. These genes were primarily hosted by Streptomyces, Bradyrhizobium, Nocardioides and Anaeromyxobacter. Residue retention significantly increased both the abundance and richness of MRG across all sampling stages, regardless of land use type, and induced marked shifts in MRG-harboring bacterial communities. The structural equation model indicated that, in upland soils, the effects of residue retention on MRG diversity were mainly mediated by soil pH and bacterial community composition, whereas in paddy soils, they were mediated by soil available nitrogen. Mobile genetic elements (MGEs) also contributed to MRG diversity in upland, but not in paddy field. Moreover, MRGs, particularly those related to Fe- and As-, were more diverse and abundant in the paddy field than in the upland. Overall, the current study provides a foundation for assessing the potential spread of MRGs induced by residue retention under different land use types.

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