Depth-dependent nitrogen coupling among soil, microbe, and plant under altered precipitation and nitrogen input
文献类型：期刊论文
| 作者 | Li, Yibo1; Zhou, Mingxin2; Xu, Xingliang1 |
| 刊名 | PLANT AND SOIL
 |
| 出版日期 | 2025-11-20 |
| 卷号 | N/A |
| 关键词 | N-15 labeling Nitrogen-precipitation interaction Depth-resolved N uptake Soil-microbe-plant N coupling Microbial N assimilation |
| ISSN号 | 0032-079X |
| DOI | 10.1007/s11104-025-08072-4 |
| 产权排序 | 1 |
| 文献子类 | Article ; Early Access |
| 英文摘要 | Background and aims Climate change and anthropogenic nitrogen (N) deposition are altering terrestrial nutrient cycles, but their integrative effects on depth-resolved soil-microbe-plant N cycling remain poorly understood. This study aimed to disentangle how reduced precipitation and N enrichment influence soil N retention, microbial N-15 assimilation, and plant N uptake across soil depths and plant species. Methods A field experiment was conducted in a temperate forest in northeastern China using four treatments (control, N addition, precipitation reduction, and combined treatment), where N addition was applied at 50 kg N.ha(-1).yr(-1) and precipitation reduction excluded 30% of throughfall (similar to 210 mm.yr(-1)). N-15 tracers ((NH4Cl)-N-15 and (KNO3)-N-15) applied at two soil depths (0-5 cm and 5-15 cm) and sampled at two post-labeling intervals (24 h and 72 h). Results Reduced precipitation significantly suppressed plant biomass (- 21% to - 43%) and microbial biomass nitrogen (MBN, - 17.3% to - 36.2%) relative to the control. N addition substantially enhanced soil N-15 retention (by 38.5%-67.9%) and microbial N-15 assimilation (by 45.2%-73.1%), with more persistent effects at depth and over time. Adonis vernalis exhibited 1.7- to 2.5-fold greater N-15 uptake and 1.6- to 2.3-fold higher biomass accumulation compared to the others. Multivariate analyses revealed strong positive correlations among NH4+-N, microbial N-15 assimilation, and plant N-15 uptake (r = 0.82-0.89), supporting a tightly coupled and form-specific soil-microbe-plant N pathway. Conclusions These findings demonstrate that N addition and reduced precipitation have distinct, depth-specific effects on soil-microbe-plant N coupling: surface layers respond with rapid microbial assimilation and plant uptake, whereas deeper horizons retain N-15 longer through microbial immobilization and access by drought-tolerant roots. This highlights the need to incorporate depth stratification and species-specific N responses in ecosystem nutrient modeling under changing climate regimes. |
| URL标识 | 查看原文 |
| WOS研究方向 | Agriculture ; Plant Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:001619839700001 |
| 出版者 | SPRINGER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/219484]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Xu, Xingliang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China; 2.Heilongjiang Inst Construct Technol, Harbin 150001, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Yibo,Zhou, Mingxin,Xu, Xingliang. Depth-dependent nitrogen coupling among soil, microbe, and plant under altered precipitation and nitrogen input[J]. PLANT AND SOIL,2025,N/A. |
| APA | Li, Yibo,Zhou, Mingxin,&Xu, Xingliang.(2025).Depth-dependent nitrogen coupling among soil, microbe, and plant under altered precipitation and nitrogen input.PLANT AND SOIL,N/A. |
| MLA | Li, Yibo,et al."Depth-dependent nitrogen coupling among soil, microbe, and plant under altered precipitation and nitrogen input".PLANT AND SOIL N/A(2025). |
入库方式： OAI收割
来源：地理科学与资源研究所
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