Functional tipping points in plant-microbial N competition revealed by form-specific uptake in alpine grasslands
文献类型：期刊论文
| 作者 | Yu, Chengling1,2; Liu, Min1,2; Jin, Peng1,2; Liao, Jiaqiang1,2; Peng, Jinlong1,2; Xu, Xingliang1,2; Niu, Shuli1,2 |
| 刊名 | JOURNAL OF ECOLOGY
 |
| 出版日期 | 2026-01-02 |
| 卷号 | 114期号:1页码:e70233 |
| 关键词 | alpine grassland ecological threshold nitrogen deposition levels nitrogen uptake nutrient limitation plant-microbial competition plant-soil (below-ground) interactions |
| ISSN号 | 0022-0477 |
| DOI | 10.1111/1365-2745.70233 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Nitrogen (N) deposition drives nonlinear ecosystem responses, yet the underlying below-ground mechanisms that govern functional tipping points remain poorly understood. We conducted an in situ 15N labelling experiment using NO3- and NH4+ across six N addition levels (0-32 g N m-2 year-1, designated N0-N32) in an alpine grassland on the Qinghai-Tibetan Plateau. Total biomass increased with N addition up to moderate N levels (N8) before reaching a plateau, while total plant N uptake peaked early (N2) at 3086 mg N m-2 and declined thereafter, revealing a decoupling between structural growth and functional N acquisition. Notably, plants exhibited a transient shift in N form preference from NH4+ to NO3- under low N addition (N2), concurrent with a decline in microbial N uptake (484 mg N m-2) and a similar shift in their preference. These patterns intensified plant-microbial competition for NO3- at N2 but weakened subsequently at higher N levels. Synthesis. Our results demonstrate a threshold shift in N acquisition strategies that precedes biomass saturation. We propose that N form preference patterns and associated shifts in plant-microbial competition can serve as early-warning indicators of ecosystem N saturation, providing mechanistic insights to improve threshold-based nutrient management in alpine grasslands. |
| URL标识 | 查看原文 |
| WOS关键词 | NITROGEN DEPOSITION ; SOIL-MICROORGANISMS ; INORGANIC NITROGEN ; ECOSYSTEM ; NITRATE ; LIMITATION ; RESPONSES ; ROOTS ; BIODIVERSITY ; MECHANISMS |
| WOS研究方向 | Plant Sciences ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001653085800001 |
| 出版者 | WILEY |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/219728]  |
| 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, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China; 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Chengling,Liu, Min,Jin, Peng,et al. Functional tipping points in plant-microbial N competition revealed by form-specific uptake in alpine grasslands[J]. JOURNAL OF ECOLOGY,2026,114(1):e70233. |
| APA | Yu, Chengling.,Liu, Min.,Jin, Peng.,Liao, Jiaqiang.,Peng, Jinlong.,...&Niu, Shuli.(2026).Functional tipping points in plant-microbial N competition revealed by form-specific uptake in alpine grasslands.JOURNAL OF ECOLOGY,114(1),e70233. |
| MLA | Yu, Chengling,et al."Functional tipping points in plant-microbial N competition revealed by form-specific uptake in alpine grasslands".JOURNAL OF ECOLOGY 114.1(2026):e70233. |
入库方式： OAI收割
来源：地理科学与资源研究所
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