Cadmium accumulation suppresses rice nitrogen use efficiency by inhibiting rhizosphere nitrification and promoting nitrate reduction
文献类型：期刊论文
| 作者 | Shi, Fangying1,2; Fang, Huajun1,2,3; Cheng, Shulan2; Guo, Yifan1,2; Wang, Hui1,2; Chen, Long2; Pu, Haiguang1,2; Liu, Bingqian2 |
| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
 |
| 出版日期 | 2025-09-15 |
| 卷号 | 496页码:139298 |
| 关键词 | Cadmium accumulation Nitrogen transformation Nitrogen use efficiency Metagenomics Paddy soil |
| ISSN号 | 0304-3894 |
| DOI | 10.1016/j.jhazmat.2025.139298 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Cadmium (Cd) pollution significantly disrupts paddy soil nitrogen (N) availability and impairs rice nitrogen use efficiency (NUE). However, most existing studies rely on microcosm or pot experiments, with limited field-based manipulative studies involving Cd addition. The regulatory mechanisms by which N transformation processes influence rice N utilization under Cd stress remain poorly understood. In this study, a field experiment incorporating multiple levels of Cd addition was conducted to address this gap. Plant traits, nutrient content, and microbial community characteristics in rhizosphere and bulk soils were examined through soil chemical analysis, metagenomic sequencing, and bioinformatics approaches. The results demonstrated that microbial communities, soil N transformation potential, and rice NUE responded to Cd addition in a dose-dependent manner, with rhizosphere soils exhibiting greater sensitivity than bulk soils. Cd addition reduced dissolved organic carbon (DOC), NH4*-N, and NO3--N in rhizosphere soil, while increasing total and available phosphorus (P) contents in both rhizosphere and bulk soils. Although Cd addition enhanced aboveground biomass and total N uptake, it led to a decline in plant N concentration and NUE. Moreover, Cd accumulation markedly suppressed the abundance of nitrification genes while promoting genes involved in dissimilatory nitrate reduction to ammonium (DNRA) and denitrification. Overall, Cd stress altered microbial community structure and soil N and P availability, thereby impairing rice N uptake and NUE. These findings suggest that acute Cd exposure rapidly disrupts microbial ecology, decouples the soil N cycle, and reduces N supply potential of paddy soils and rice NUE, ultimately threatening agroecosystem stability in southern China. These impacts warrant greater consideration in future farmland management strategies. |
| URL标识 | 查看原文 |
| WOS关键词 | MICROBIAL COMMUNITY STRUCTURE ; HEAVY-METALS ; PADDY SOIL ; BIOAVAILABILITY ; CONTAMINATION ; ENZYMES ; GROWTH ; CD |
| WOS研究方向 | Engineering ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001539594600002 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/215604]  |
| 专题 | 千烟洲站森林生态系统研究中心_外文论文 |
| 通讯作者 | Fang, Huajun; Cheng, Shulan |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China; 3.Zhongke Jian Inst Ecoenvironm Sci, Jian 343000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi, Fangying,Fang, Huajun,Cheng, Shulan,et al. Cadmium accumulation suppresses rice nitrogen use efficiency by inhibiting rhizosphere nitrification and promoting nitrate reduction[J]. JOURNAL OF HAZARDOUS MATERIALS,2025,496:139298. |
| APA | Shi, Fangying.,Fang, Huajun.,Cheng, Shulan.,Guo, Yifan.,Wang, Hui.,...&Liu, Bingqian.(2025).Cadmium accumulation suppresses rice nitrogen use efficiency by inhibiting rhizosphere nitrification and promoting nitrate reduction.JOURNAL OF HAZARDOUS MATERIALS,496,139298. |
| MLA | Shi, Fangying,et al."Cadmium accumulation suppresses rice nitrogen use efficiency by inhibiting rhizosphere nitrification and promoting nitrate reduction".JOURNAL OF HAZARDOUS MATERIALS 496(2025):139298. |
入库方式： OAI收割
来源：地理科学与资源研究所
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